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02061-dsh-001-g mindspeed technologies ? july 2012 mindspeed proprietary and confidential m02061 3.3 or 5 volt laser driver applications ? sfp and sff modules ? 1g/2g/4g fibre channel modules ? short reach and metro sonet/sdh ? cpri: 614.4, 1228.8, 2457.6, 3072 .0, 4915.2 and 6144.0 mbit/s the m02061 is a highly integrated, programmable laser driver intended for sfp/sff modules. using differential pecl data inputs, the m02061 supplies the bias and modulation current required to drive an edge-emitting laser. the modulation output can be dc coupled to the laser diode. the m02061 includes automatic power control to maintain a constant average laser output power over temperature and life. in addition, the modulation current can be temperature compensated to minimize variation in extinction ratio over temperature. features ? high-speed operation; suitab le for sfp/sff applications. typical rise/fall times of 55 ps. ? programmable temperature comp ensation. modulation output and bias output can be controlled using a few discrete resistors. ? supports ddmi (sff-8472) diagnostics ? dc or ac coupled modulation dr ive. up to 100 ma modulation current available when ac coupled. ? low overshoot allows high ex tinction ratio with low jitter ? automatic laser power c ontrol, with ?slow-start? ? pecl and cml compatible differential data inputs ? complies with major msas (gbic, sff, sff-8472, sfp) including timing requirements ? packaged in a qfn24 ? 3.3 v or 5 v operation ? pulse width adjustment typical applications diagram input buffer v cc3 -1.3v internal 3.3v reg. input buffer d - ff output buffer laser driver automatic power control (laser bias current) safety circuitry with latched fault modulation control v cc v cc 3 fail vcc3 se l pwa shdwn out sv cc out- out+ gnd 0 ibias out ipin dis mod set tc slope mod mon rese t bias mon apc set c apc txp wr mon d in - d in + internal power bus v cc3 v cc v cc v cc3 v cc v cc scb disdly (m02061-12 only) (m02061-21 only) tx disable
02061-dsh-001-g mindspeed technologies ? 2 mindspeed proprietary and confidential ordering information part number package pin confitguration m02061-12 qfn24 disdly function on pin 8 m02061g-12* qfn24 (rohs complian t) disdly function on pin 8 m02061-21 qfn24 scb function on pin 8 m02061g-21* qfn24 (rohs compliant) scb function on pin 8 M02061-EVM combination optical and electrical evaluation board disdly function on pin 8 *the g in the part number indicates that this is an rohs comp liant package. refer to www.mindsp eed.com for additional informati on. revision history revision level date asic revision description g release july 2012 x added recommendation for 100 k pull-up resistor at pin 14 ibiasout when pin 18 svcc is used to control laser current. f release february 2010 x added cpri data rates to front page. added t j specification and added equation for t a specification in table 1-1 . e release february 2006 x added information for the m02061-21 with pin scb instead of pin disdly. d release september 2005 x new format. remove 32 pin package information. changes to absolute maximum specifications - operating temperature, output voltage. changes to recommended operating conditions - vcc, operating temperature. changes to dc characteristics - icc, vmd, txpwrmon, logic inputs and outputs, data inputs, safety logic thresholds. changes to ac characteristics - imod, tr, tf, jitter. c preliminary march 2004 x added eye diagram, ; corrected rise/fall times. 2.5gbps electrical eye diagram conditions: 80ma modulation current, 2^7-1 prbs qfn24 pin configuration v cc din+ din- vcc3 sel mod mon bias mon c apc v cc3 pwa tc slope fail reset scb/disdly txpwr mon apc set i pin gnd 0 out+ out- sv cc shdwn out mod set ibias out dis 1 6 712 13 18 19 24 4mm x 4mm gnd, connect to pcb ground
02061-dsh-001-g mindspeed technologies ? 3 mindspeed proprietary and confidential 1.0 product specification 1.1 absolute maximum ratings these are the absolute maximum ratings at or beyond which the ic can be expected to fail or be damaged. reliable operation at these extremes for any length of time is not implied. table 1-1. absolute maximum ratings symbol parameter rating units v cc power supply voltage -0.4 to +6.0 v t j junction temperature -40 to +110 1 c v cc3 3.3v power supply voltage -0.4 to +4.0 v t a operating ambient temperature -40 to +95 2 c t stg storage temperature -65 to +150 c i biasout (max) maximum bias output current 150 ma i mod (max) maximum modulation current 140 ma d in +/- data inputs 0 to v cc3 + 0.4 v dis, scb, vcc3 sel mode control inputs -0.4 to v cc + 0.4 v bias mon , mod mon bias and modulation output current mirror compliance voltage -0.4 to v cc3 + 0.4 v ipin photodiode anode voltage -0.4 to v cc3 + 0.4 v ipin photo diode current 2 ma fail status flags -0.4 to v cc + 0.4 v pwa, apc set , mod set set inputs -0.4 to v cc3 + 0.4 v tc start temperature compensation star t temperature -0.4 to 1.0 v tc slope temperature compensation slope -0.4 to v cc3 + 0.4 v out+, out- output -0.4 to v cc + 0.4 v 1. qfn package: air velocity ja 0 m/s 57 oc/w 1 m/s 50 oc/w 2.5 m/s 45 oc/w the above thermal resistance is based on a 4-layer jedec standard board (76.2 x 114.3 mm). 2. the maximum operating ambient temper ature is the lesser of 95 c or t a t j (max) - ( ja (max) x q) where q is the power dissipated in the m02061.
product specification 02061-dsh-001-g mindspeed technologies ? 4 mindspeed proprietary and confidential 1.2 recommended operating conditions 1.3 dc characteristics (v cc = +3.05v to +3.55v or 4.75v to 5.4v, t a = -40 c to +95 c, unless otherwise noted) typical values are at v cc = 3.3 v, i biasout = 30 ma, i mod = 30 ma, t a = 25 c, unless otherwise noted. table 1-2. recommended operating conditions parameter rating units power supply (v cc -gnd) 3.3 7.5% or 5.0 + 8%, -5% v operating ambient -40 to + 95 c table 1-3. dc characteristics (1 of 3) symbol parameter conditions minimum typical maximum units i cc supply current excluding i mod and i bias pwa high (no pulse width adjust) additional current when pwa used additional current when operating from a 5v supply ? - - 35 1.5 1.5 61 - - ma i bias bias current adjust range v(i biasout ) > 0.7v for 3.3v operation with an ac coupled laser for 5.0v operation with a dc coupled laser. 1 1 100 60 ma i bias(off) bias current with optical output disabled dis = high v(i biasout ) > v cc - 1v ? ? 300 a ratio of i bias current to bias mon current ?100 ? a/a v md monitor diode reverse bias voltage v cc =3.3v 1.5 ? ? v i md monitor diode current adjustment range adjusted with r apcset 10 ? 1500 a ratio of txpwr mon current to monitor photodiode current 0.95 1 1.25 a/a c md_max maximum monitor photodiode capacitance for apc loop stability. includes all associated parasitic capacitances. 100 pf ttl/cmos input high voltage (dis) 2.0 ? 5.4 v
product specification 02061-dsh-001-g mindspeed technologies ? 5 mindspeed proprietary and confidential ttl/cmos input low voltage (dis) ?? 0.8 v cmos input high voltage (vcc3 sel , scb) 2.4 v cmos input low voltage (vcc3 sel , scb) 1.2 v logic output high voltage (fail) with external 10k pull-up to v cc .v cc - 0.5 ? ? v logic output low voltage (fail) for 6.8k to 10k resistor when pulled up to 5v. for 4.7k to 10k resistor when pulled up to 3.3v. ?? 0.4 v r in differential input impedance data inputs ? 6800 ? v self self-biased common-mode input voltage ?v cc3 - 1.3 ? v v incm common-mode input compliance voltage data inputs v cc3 - 1.45 ? v cc3 -[v in(diff) ]/4 v v in(diff) differential input voltage = 2 x (d in + high - d in + low ) 200 ? 2400 mvpp v cc3thl (1) 3.3v supply detection, lower threshold 2.5 2.8 3.0 v v cc3thh (1) 3.3v supply detection, upper threshold 3.65 3.9 4.25 v v cc5thl 5v supply detection, lower threshold 3.9 4.25 4.65 v v cc5thh 5v supply detection, upper threshold 5.4 5.8 6.1 v v ref1 reference voltage for mod set 1.18 1.3 1.4 v v apcset reference voltage for apc set 1.3 v v bl bias_ok lower voltage threshold 0.88 1.0 1.05 v table 1-3. dc characteristics (2 of 3) symbol parameter conditions minimum typical maximum units
product specification 02061-dsh-001-g mindspeed technologies ? 6 mindspeed proprietary and confidential 1.4 ac characteristics (v cc = 3.05 v to 3.55v or 4.75v to 5.4v, t a = -40 c to +95 c, unless otherwise noted) typical values are at v cc = 3.3 v, i biasout = 30 ma, i mod = 30 ma, 25 ohm load and t a = 25 c, unless otherwise noted. v bh bias_ok upper voltage threshold 1.45 1.6 1.7 v v faultl lower voltage threshold for fault inputs i biasout , out+, c apc , and mod set fail asserts if any of these signals fall below this value. 300 400 mv v out_dis self bias voltage for i biasout and out+ dis = high 0.5 1.65 2.2 v v shdwnl shdwn out output low voltage dis = low, i shdwnout 100ua v cc - 4 v v shdwnh shdwn out output high voltage dis = low, i shdwnout 10ua v cc - 0.3v v notes: 1. when v cc = 5v, v cc3 ?supply ok? circuitry monitors the internally regulated 3.3v supply. when v cc = 3.3v, v cc3 ?supply ok? circuitry monitors v cc . table 1-4. ac characteristics (1 of 2) symbol parameter conditions minimum typical maximum units i mod modulation current range 3.3v operation, ac coupled, out+ and out- > 1.6v 5v operation, dc coupled (1) into a 25 load to vcc - 1.2v. out+ and out- > 1.15v 10 10 ? 100 80 ma i mod(off) modulation current with output disabled dis = high ? ? 300 a ratio of modulation current to mod mon current ?100 ? a/a i mod-tc programmable range for modulation current temperature coefficient adjustable using tc slope (2) 0?10 4 ppm/c table 1-3. dc characteristics (3 of 3) symbol parameter conditions minimum typical maximum units
product specification 02061-dsh-001-g mindspeed technologies ? 7 mindspeed proprietary and confidential 1.5 safety logic timing (scb pin low, v cc = 3.05 v to 3.55v or 4.7v to 5.4v, t a = -40 c to +95 c, unless otherwise noted) tr modulation output rise time 20% to 80% into 25 . measured using 11110000 pattern at 2.5gbps ?55 75 ps tf modulation output fall time ? 55 75 ps os overshoot of modulation output current in the off direction. into 25 load -- 1 ? % rj random jitter ? 0.8 ? ps rms dj deterministic jitter measured into 25 load, 2 31 - 1 prbs at 2.7 gbps k28.5 pattern at 4.25 gbps (includes pulse width distortion 3 ) 10 10 25 30 ps pp notes: 1. guaranteed by design and characterization. 2. dc coupled operation at 3.3v is not supported. ac coupled operation at 5v is possible provided the outputs never exceed 6v. 3. pulse width distortion is measured single-ended. table 1-5. safety logic timing (1 of 2) symbol parameter conditions minimum typical maximum units t_off dis assert time rising edge of dis to fall of output signal below 10% of nominal (1) 10 s t_on dis negate time falling edge of dis to rise of output signal above 90% of nominal (1) 1ms t_init time to initialize (2) includes reset of fail; from power on after supply_ok or from negation of dis during reset of fail condition 23 5 ms table 1-4. ac characteristics (2 of 2) symbol parameter conditions minimum typical maximum units (2)
product specification 02061-dsh-001-g mindspeed technologies ? 8 mindspeed proprietary and confidential t_fault laser fault time - from fault condition to assertion of fail from occurrence of fault condition or when supply_ok is beyond specified range 100 s t_reset dis time to start reset dis pulse wi dth required to initialize safety circuitry or reset a latched fault 10 (3) s t vcc_ok supply_ok delay time delay betwee n supply_ok condition and when outputs are enabled 10 20 s t_on bm dis negate (turn-on) time during burst-mode operation i mod > 20ma; outputs dc coupled (5v operation) (4) 300 500 ns t_off bm dis assert (turn-of f) time during burst-mode operation i mod > 20ma; outputs dc coupled (5v operation) 200 500 ns notes: 1. with capc < 2.2nf 2. user-adjustable. specifications reflect timing with no external reset capacitor. 3. with < 1nf capacitor from reset pin to ground. 4. imod >12ma figure 1-1. relationship between data inputs and modulation outputs table 1-5. safety logic timing (2 of 2) symbol parameter conditions minimum typical maximum units d in + d in - 100 mv - 1200 mv v in(diff) 200 mv - 2400 mv v out- > 1.60v when v cc5_or high > 1.15v when v cc5_or low gnd v out+
product specification 02061-dsh-001-g mindspeed technologies ? 9 mindspeed proprietary and confidential figure 1-2. safety logic timing characteristics, scb pin low v cc3 fail dis laser output (low) (low) 3.3v t_on < 1ms, (300 s typ.) v cc 5v v cc3 and v cc5 status fail dis laser output (low) (low) v cc3 and v cc5 ?ok? t_on < 1ms, (300 s typ.) hot plug (dis low) slow rise on vcc = 5v at power-up (dis low) v cc3 fail dis laser output (low) (low) 3.3v t_on < 1ms, (300 s typ.) v cc 3.3v fail state at power-up will depend on pull-up voltage slow rise on vcc=3.3v at power-up (dis low) v cc3 and v cc5 status fail dis laser output (low) (low) v cc3 and v cc5 ?ok? t_on < 1ms, (300 s typ.) (high) transmitter enable (dis transition low)
product specification 02061-dsh-001-g mindspeed technologies ? 10 mindspeed proprietary and confidential v cc3 and v cc5 status fail dis laser output (low) v cc3 and v cc5 ?ok? t_off < 10 s, (1 s typ.) (high) fault recovery behavior fault recovery at: mod set . c apc , out+, or ibout fail dis laser output fault removed t_reset, 10 s, min. fail remains high until reset by dis going high t_on < 1ms transmitter disable (dis transition high) fault at: mod set . c apc , outp, or ibout fail dis laser output fault occurs t_fault < 100 s, (4 s typ.) response to fault fault at: apc set fail dis laser output fault remains t_reset, 10 s, min. t_init < 5ms, (3ms typ.) unsuccessful faul t reset attempt
02061-dsh-001-g mindspeed technologies ? 11 mindspeed proprietary and confidential 2.0 pin definitions ta bl e 2-1 lists pin type definitions and descriptions for the m02061 device. table 2-1. m02061 pin definitions and descriptions (1 of 7) 4x4 mm qfn24 pin number pin name pin equivalent load function 1v cc power supply 2d in + positive data input. self biased. compatible with ac coupled pecl, ac coupled cml, and dc-coupled pecl (v cc = 3.3v). when d in + is high, out+ sinks current. 3d in - see d in + drawing negative data input. self biased compatible with ac coupled pecl, ac coupled cml, and dc-coupled pecl (v cc = 3.3v). 4 vcc3 sel 3.3v v cc select. connect to v cc3 for v cc = 3.3v operation. connect to gnd for v cc = 5v operation. v cc3 clk+, clk- d in +, d in -, or v tt 4 k v cc 72 k v cc5_ or 190 v cc v cc3
pin definitions 02061-dsh-001-g mindspeed technologies ? 12 mindspeed proprietary and confidential 5 dis bias and modulation out put disable (ttl/cmos). 6 fail safety circuit control failure output (ttl/cmos). goes high when a safety logic fault is detected. this output will be low when dis is high. 7 reset safety circuit reset. leave open fo r normal operation or add a capacitor to ground to extend the reset time. connect to gnd to disable window comparators at apc set table 2-1. m02061 pin definitions and descriptions (2 of 7) 4x4 mm qfn24 pin number pin name pin equivalent load function 80 k dis 7 k v cc3 v cc fail v cc reset 190 v cc v cc3
pin definitions 02061-dsh-001-g mindspeed technologies ? 13 mindspeed proprietary and confidential 8 (m02061-21 only) scb safety circuit bypass. connect to gn d or leave open for no rmal operation. connect to vcc to allow the bias and modulation outputs to operate even if the safety circuitry indicates a fault. 8 (m02061-12 only) disdly disable delay control. connect to ground for normal operation. in burst mode operation add a capacitor from this pin to ground to set the maximum disable time. disable times greater than this maximum will engage the ?slow-start? circuitry. 9mod mon modulation current monitor. connect directly through a resistor to gnd (mon pol high) or to v cc3 (mon pol low). the current through this pin is approximately 1/100th of the modulation current to the laser. this pin may be left open if the feature is not needed and the m02061 current consumption will be reduced by 0.5ma typically. table 2-1. m02061 pin definitions and descriptions (3 of 7) 4x4 mm qfn24 pin number pin name pin equivalent load function 48 k scb 24 k v cc v cc3 disdly 190 v cc 190 mod mon v cc v cc3
pin definitions 02061-dsh-001-g mindspeed technologies ? 14 mindspeed proprietary and confidential 10 bias mon see mod mon drawing bias current monitor. connect di rectly through a r esistor to gnd (mon pol high) or to v cc3 (mon pol low). the current through this pin is approximately 1/100th of the bias current to the laser. this pin may be left open if the feature is not needed and the m02061 current consumption will be reduced by 0.5ma typically. 11 txpwr mon transmit power monitor. connect di rectly through a resistor to gnd (mon pol high) or to v cc3 (mon pol low). the current through this pin is approximately the same as the photo diode current into ipin. this pin may be left open if the feature is not needed and the m02061 current consumption will be reduced by the ipin current. 12 apc set average power control, laser bias curr ent adjustment. connect a resistor between this pin and ground to set the bias current to the laser. the apc loop will control the laser bi as current to maintain a voltage of approximately 1.3v at this pin. the cu rrent through this pin is approximately the same as the current into i pin . 13 i pin current input from monitor photodiode anode. the apc loop will adjust the laser bias current to maintain a voltage at apc set of approximately 1.3v and at this pin of approximately one v gs . the voltage at this pin will not exceed 1.6v in normal operation table 2-1. m02061 pin definitions and descriptions (4 of 7) 4x4 mm qfn24 pin number pin name pin equivalent load function 33 txpwr mon v cc v cc3 apc set v cc v cc3 30 i pin v cc
pin definitions 02061-dsh-001-g mindspeed technologies ? 15 mindspeed proprietary and confidential 14 ibias out laser bias current output. connect directly to laser cathode or at higher bit rates through a ferrite or a resistor to isolate the capacitance of this pin from the modulation drive, (~2pf). maintain a voltage > 0.7v at this pin. connect 100 k pullup resistor to vcc if pin 18 (svcc) is used. 15 gnd o ground for output stage. may be connect ed directly to ground. at high bit rates (>2gb/s) an optional inductor or ferrite may be added to reduce switching transients. 16 out+ positive modulation current output. sinks current when d in + is high. maintain a voltage > 1.6v at this pin when vcc3 sel is high. maintain a voltage > 1.15v at this pin when vcc3 sel is low. 17 out- see out+ drawing negative modulatio n current output. sinks current when d in - is high maintain a voltage > 1.6v at this pin when vcc3 sel is high. maintain a voltage > 1.15v at this pin when vcc3 sel is low. table 2-1. m02061 pin definitions and descriptions (5 of 7) 4x4 mm qfn24 pin number pin name pin equivalent load function ibias out v cc gnd 0 v cc out+ v cc gnd 0
pin definitions 02061-dsh-001-g mindspeed technologies ? 16 mindspeed proprietary and confidential 18 sv cc switched v cc . 3.3v applications - connect to laser anode. safety circuitry will open the switch when a fault is detected and no current will flow through the laser. no capacitance is needed on this node. if capacitance to ground is added, do not exceed 100 pf. 5v applications - disabled, leave open. 19 shdwn out external switched v cc control signal. use in 5v applications to create an external sv cc. 20 c apc automatic power control loop dominant pole capacitor. (connect a capacitor between this pin and v cc3 .) a 2.2 nf capacitor will give less than 1ms enable time and a loop bandwidth < 30khz. table 2-1. m02061 pin definitions and descriptions (6 of 7) 4x4 mm qfn24 pin number pin name pin equivalent load function sv cc v cc v cc3 shdwn out v cc 12 k 100 c apc v cc
pin definitions 02061-dsh-001-g mindspeed technologies ? 17 mindspeed proprietary and confidential 21 v cc3 3.3v applications - power supply input. connect to v cc . 5v applications - internally genera ted 3.3v. power supply output. do not attach to non-m02061 circuitry. for 5 v applications add 12 ohms in series with 100 nf to ground at this pin. 22 pwa pulse width adjust. connect a resi stor to gnd to enable, (between 1k and 20k ). connect to v cc3 to disable. 23 mod set see pwa drawing modulation current control. connect a resistor to ground to set the modulation current. 24 tc slope see pwa drawing modulation current temperat ure compensation coef ficient adjustment. connect a resistor to ground to set the temperature compensation coefficient. leave open to disab le the temperature compensation. a 51 k resistor will result in a te mperature compensation slope of approximately 0.5%/c. center pad gnd connect to gnd. table 2-1. m02061 pin definitions and descriptions (7 of 7) 4x4 mm qfn24 pin number pin name pin equivalent load function v cc3 v cc v cc 190 pwa v cc v cc3 + - 1.28v
pin definitions 02061-dsh-001-g mindspeed technologies ? 18 mindspeed proprietary and confidential figure 2-1. qfn24 pinout information v cc din+ din- vcc3 sel mod mon bias mon c apc v cc3 pwa tc slope fail reset scb/disdly txpwr mon apc set i pin gnd 0 out+ out- sv cc shdwn out mod set ibias out dis 1 6 712 13 18 19 24 4mm x 4mm gnd, connect to pcb ground
02061-dsh-001-g mindspeed technologies ? 19 mindspeed proprietary and confidential 3.0 functional description 3.1 overview the m02061 is a highly integrated, programmable laser driver intended for sfp/sff module with data rates up to 4.25 gbps. using differential pecl data inputs, the m02061 supplies the bias and modulation current required to drive an edge-emitting laser. monitor outputs and internal safety logic in the m02061 combined with the m02088 will support designs requiring ddmi compliance. the m02061 includes automatic power control to maintain a constant average laser output power over temperature and life. in addition, the modulation current can be temperature compensated to minimize variation in extinction ratio over temperature. many features are user-adjustable, including the apc (aut omatic power control) loop bias control (via a monitor photo diode), modulation current, temperature compensation control of modulation current, and pulse-width adjustment. the part may be operated from a 3.3v or 5v supply. the driver modulation output can be ac, dc, or differentially coupled to the laser. safety circuitry is also included to provide a latched shut-down of laser bias and modulation current if a fault condition occurs. an internal v cc switch provides redundant shutdown when operating the device from a 3.3v supply. control is provided to allow for a redundant external switch when operating with a 5v supply, if desired. figure 3-1 details the functional blocks and pin signals for the m02061 device.
functional description 02061-dsh-001-g mindspeed technologies ? 20 mindspeed proprietary and confidential figure 3-1. m02061 block diagram v cc3 -1.3v automatic power control (laser bias current) tx disable safety circuitry with latched fault modulation control v cc v cc 3 fail vcc3 sel pwa shdwn out sv cc out- out+ gnd 0 ibias out ipin dis mod set tc sl o p e mod mon reset bias mon apc set c apc txpwr mon d in - d in + internal power bus scb disdly (m02061-21 only) (m02061-12 only) d - ff output buffer laser driver input buffer internal 3.3v reg.
functional description 02061-dsh-001-g mindspeed technologies ? 21 mindspeed proprietary and confidential figure 3-2. 2.5gbps electrical eye diagram conditions: 80ma modulation current, 2 7 -1 prbs
functional description 02061-dsh-001-g mindspeed technologies ? 22 mindspeed proprietary and confidential figure 3-3. 2.5gbps filtered optical eye diagram with nec nx7315ua laser conditions: 10db extinction ratio, 33% eye margin, 2 7 -1 prbs figure 3-4. 4.25gbps unfiltered optical eye diagram with archcom ac3460 laser conditions: 7.5db extinction ratio, 2 7 -1 prbs
functional description 02061-dsh-001-g mindspeed technologies ? 23 mindspeed proprietary and confidential 3.2 features ? high speed operation; suitable for sfp/sff applications from 155mbps to 4.25 gbps. typical rise/fall times of 55 ps. ? programmable temperature compensation. modulation output and bias output can be controlled using a few discrete resistors. ? supports ddmi (sff-8472) diagnostics when combined with the m02088. ? dc or ac coupled modulation drive. up to 100ma modulation current available when ac coupled. ? low overshoot allows high extinction ratio with low jitter. ? automatic laser power co ntrol, with ?slow-start?. ? differential data inputs to minimize pattern dependent jitter, pecl and cml compatible. ? packaged in a qfn24 ? 3.3v or 5v operation 3.3 general description the m02061 is a highly integrated, programmable laser driver intended for sfp/sff module with data rates up to 4.25 gbps. using differential pecl data inputs, the m02061 supplies the bias and modulation current required to drive an edge-emitting laser. monitor outputs and internal safety logic support the ddmi requirements. the m02061 laser driver consists of the following circuitry: an internal regulator, bias current generator and automatic power control, data inputs, buffer with pulse width adjust, modulation current control, modulator output, laser fail indication, disable control, and monitor outputs for the bias current, modulation current, and transmitted power. 3.3.1 internal regulator the m02061 contains an internal 3.3v regulator so high bit rate performance can be achieved with 5v or 3.3v power supply. when operating from a 5v supply (v cc is connected to +5v), an internal regulator provides a voltage of approximately 3.3v to the majority of the on-chip circ uitry. the on-chip regulator is internally compensated, requiring no external components. however, for 5v operation with high modulation currents, it may be necessary to add 12 ohms in series with 100nf to ground at vcc3 or the internal power supply may dip and cause a fault condition. when a 3.3v supply is used (v cc and v cc3 connected to 3.3v) the regulator is switched off and the internal circuitry is powered directly through the v cc3 supply pin. the decision as to whether or not the internal regulator is required is made via the vcc3 sel pin, which also determines whet her the safety circuitry needs to monitor for proper +5v supply voltage. for 3.3v applications, sv cc is sourced from v cc3 through a switch (leave sv cc open for 5v applications). sv cc is to be used to power the anode of the laser diode and the cathode of the photo diode, any resistive or ferrite pull-ups on the out+ and out- outputs should be connected directly to vcc. when a fault condition is present, fail will assert and the switch sourcing sv cc will open so no current can pass through the laser. sv cc does not need any external capacitance, if capacitance to ground is added at sv cc it should be < 100 pf. when svcc is used, add a 100k pullup resistor to vcc at pin 14 (ibiasout). for 5v operation, an analog switch controlled by shtdwn out can be used to source 5v to the laser anode. in the case of a fault condition, shtdwnout will go high a nd open the analog switch wh ich will result in an open circuit at the laser. shtdwnout is designed to drive a cmos logic input. an fet transistor may have excessive miller capacitance and a fault may be signalled if it turns on too slow.
functional description 02061-dsh-001-g mindspeed technologies ? 24 mindspeed proprietary and confidential v cc and v cc3 status are internally monitored by the m02061 during power-up and normal operation. during power-up the ?slow-start? circuitry requires that v cc and v cc3 each reach an acceptable level before enabling bias or modulation current. 3.3.2 bias current generator and automatic power control to maintain constant average optical power, the m02061 incorporates a control loop to compensate for the changes in laser threshold cu rrent over temperature and lifetime. the bi as current will be determined by the value of the external resistor r apcset and the transfer efficiency between the laser and monitor photo diode. the photo current from the monitor photo diode mounted in the laser package is sunk at i pin . this photo current is mirrored and an equivalent current is sourced from pins txpwr mon and apc set . the apc loop adjusts the laser bias current (hence the monitor diode photo current) to maintain a voltage at apc set of 1 band-gap voltage or ~1.3v. r apcset * i pin = 1.3 v the apc loop has a time constant determined by c apc, r apcset and the transfer efficiency between the laser and monitor photo diode. the larger the c apc capacitor the lower the bandwidth of the loop and the larger r apcset the lower the loop bw. in general, it is recommended that at least 2.2 nf of external capacitance be added externally between c apc and v cc3 . with use of a 2.2 nf capacitor, the bias current can reach 90% of its final value within 1ms, i.e., bias current rise-time is less than 1ms and the apc loop bandwidth is le ss than 30 khz, which should be adequate for bit rates of 155mbps. (and all higher bit rates). the bias generator also includes a bias current monitor mirror (bias mon ), whose output current is typically 1/100th of the bias current. this pin can be connected directly th rough a resistor to ground. if this function is not needed this pin can be left open. 3.3.3 data inputs both cml and pecl inputs signals can be ac coupled to the m02061. these inputs are internally biased to approximately v cc3 - 1.3v. in most applications the data inputs are ac coupled with controlled impedance pcb traces which will need to be te rminated externally with a 100 or 150 resistor between the + and - inputs. pecl and cml signals may be dc coupled to the m02061 data inputs when both the m02061 and the source of the input signals are operating from 3.3v supplies. if the m02061 is operating from a 5v supply, pecl and cml table 3-1. pin connection for 3.3v and 5v v cc pin connection for: v cc = 3.3v v cc = 5v pins dependent on v cc voltage v cc3 connect to v cc reference for c apc and pwa sv cc laser anode open shdwn out open external safety control switch c apc capacitor between c apc and v cc3 or v cc capacitor between c apc and v cc3 (not v cc ) pwa connect to v cc3 or v cc to disable connect to v cc3 to disable (not v cc ) vcc3 sel connect to v cc3 or v cc connect to gnd
functional description 02061-dsh-001-g mindspeed technologies ? 25 mindspeed proprietary and confidential signals may be dc coupled as long as the source of the input signals is operating at a 3.3v supply and the signals are referenced to vcc3 at the m02061. 3.3.4 pulse width adjust the data output buffer incorporates pulse-width adjustment control to compensate for laser pulse width distortion. a potentiometer can be connected between the pwa input and gnd for adjustment (programming resistance should be between 1k and 20k ). by adjusting the potentiometer, the pulse-width can be adjusted over a range of approximately 40 ps. pulse width control can be disabled by connecting pwa to v cc3 , resulting in roughly a 50% crossing point at the output and reducing supply current by approximately 1.5ma. 3.3.5 modulation control there are programmable control lines for controlling the modulation current and its temperature compensation. these inputs can be programmed simply with a resistor to ground. the modulation current amplitude is controlled by the mod set input pin. the modulation current is temperature compensated by the tc slope inputs. the temperature compensation is independent of the setting. if the temperature compensation at tcslope is disabled, the modulation output current is simply: iout = 100 x (1.3v / r modset ) where r modset is the resistance from pin mod set to ground. figure 3-5 is the most accurate method for selecting rtcslope. however, you can also select r tcslope using the following relationship: r tcslope = 19.5*(tc) -1.5 , where tc is the desired slope of the modulation current from 25c to 85c in%/c and r tcslope is in k . if no temperature compensation is desired, leave r tcslope open. in any case, r tcslope will have negligible effect at m0206 1 case temperatures below 10c. for example: given a laser with a desired modulation current at low temperatures of 30ma and a temperature coefficient of - 0.5%/c at high temperatures (w hich will require a laser driver te mperature coefficient of +0.5%). choose r modset = 100 x (1.3v / 30ma) = 4.3 k choose r tcslope =19.5*(0.5) -1.5 k = 56k .
functional description 02061-dsh-001-g mindspeed technologies ? 26 mindspeed proprietary and confidential 3.3.6 modulator output the output stage is designed to drive a 25 output load over a wide range of currents and circuit architectures. the laser may be ac, dc, or differentially co upled depending on the supply voltage. figure 3-5. tc slope compensation behavior table 3-2. modulation current maximums max modulation current max bias current v cc =5v, laser dc coupled 80 60 v cc =5v, laser ac coupled 80 (1) 60 v cc =3.3v, laser dc coupled 100 (2) 100 v cc =3.3v, laser ac coupled 100 100 when differentially coupling, the maximum modulation and bias curre nt is determined by either the ac or dc coupling of the out+ or out- output, whichever has the minimum rating. 1. when ac coupling the output should never be allowed to swi ng above the absolute voltage rating of the part, which is 6v. 2. when v cc =3.3v, the out+ and out- should not be driven below 1.6v. in mo st 3.3v applications, this will make dc coupling impractical. -30.00 -20.00 -10.00 0.00 10.00 20.00 30.00 40.00 50.00 60.00 -40 -20 0 20 40 60 80 100 ambient temperature in degrees c % change in modulation current rtcslope: 22k 27k 33k 39k 47k 51k 62k 75k 82k 100k 120k 150k 220k 390k 750k open
functional description 02061-dsh-001-g mindspeed technologies ? 27 mindspeed proprietary and confidential when dc coupled, out+ should be connected through a series resistor to the laser such that the total impedance seen at the output is 25 ohms. this will result in the optimum pulse response while allowing the maximum modulation current (see figure 4-2 ). the output can also be ac coupled to the laser. this is the required operating mode when using a 3.3v supply (unless the laser has a small forward voltage and out+ will not go below 1. 6v). when ac coupled the dynamic resistance seen by out+ shou ld still be 25 ohms. in addition to a resistor in series with the laser, a capacitor is added in series and a ferrite is used to pull up the collector at out+ to v cc . when the laser is ac coupled, the out- pin is usually tied to the laser anode through an ac coupled series resistor which matches the impedance seen by the out+ pad (see figure 4-1 ). the output stage also has a separate current path to gnd labelled gnd 0 . this isolates the output switching currents from the rest of the system. 3.3.7 fail output the m02061 has a fail alarm output wh ich is compatible with the tx_fault signalling requirem ents of common pluggable module standards. the esd protection on this pin provides a true open collector output that can withstand significant variation in v cc when signalling between circuit boards. al so, if the m02061 loses power the pull- up will signal a fail condition. in a simple static protection scheme used by other ics the protection diodes would clamp the fail signal to ground when the chip loses power. figure 3-6. modulator output out+ 0.4pf 0.75 nh out- gnd a (optional external inductance) * * denotes bond wire internal to mlf package 0.75 nh * for v cc =5v, out+ and out- should not be driven below 1.15v for v cc = 3.3v, out+ and out- should not be driven below 1.6v.
functional description 02061-dsh-001-g mindspeed technologies ? 28 mindspeed proprietary and confidential 3.3.8 tx disable and disable delay control the dis pin is used to disable the transmit signal (both the modulation and bias current are disabled when dis = high). the dis input is compatible with ttl levels regardless of whether vcc = 5v or vcc = 3.3v. the external 4.7k and 10k pull-up resistor required by most interface standards is not needed because this pin has an internal 7k resistor to v cc . the disdly pin is used in conjunction with the dis pin to control bias current enable time. in normal operation the disdly pin should be connected to ground. in this case, each time dis transitions from high to low the bias current will be enabled by the ?slow-start? circuitry (enable time of less than 1 ms with a c apc = 2.2 nf). for burst mode operation a capacitor c is added to the disdly pin, the slow-start circuitry is disabled for approximately t = 3 * 10 6 (sec/f) * c (f) following the dis high transition (see figure 8). if the part is enabled (dis transitions low) during this time the bi as and modulation cu rrent will quickly return to within 90% of their final value (in less than 500ns). if dis transitions low after the disd ly time the slow-start circ uitry will engage and the bias current will not return to its final value for approximately 1ms (depending on the c apc capacitor value).
functional description 02061-dsh-001-g mindspeed technologies ? 29 mindspeed proprietary and confidential 3.3.9 tx disable control the dis pin is used to disable the transmit signal (both the modulation and bias current are disabled when dis = high). the dis input is compatible with ttl levels regardless of whether vcc = 5v or vcc = 3.3v. the external 4.7k and 10k pull-up resistor required by most interface standards is not needed because this pin has an internal 7k resistor to v cc . figure 3-7. dis and disdly timing dis disdly out+ ibias out dis disdly out+ ibias out epon burst mode operation normal operation, (slow-start whenever part enabled) t_on bm < 500ns for i mod > 10ma t_off bm < 500ns t_off< 10 s t_on< 1ms, depending on c apc
functional description 02061-dsh-001-g mindspeed technologies ? 30 mindspeed proprietary and confidential 3.3.10 monitor outputs to facilitate complying with laser safety and ddmi 1 requirements, output monitors are provided for transmit power (txpwr mon ) bias (bias mon ) and modulation current (mod mon ). these outputs will source current proportional to the emitted optical power (txpwr mon ) the bias current (bias mon ) and modulation current (mod mon ). these pins should be terminated with a resistor to ground that sets the desired full-scale voltage (not to exceed v cc3 -1v). using a monitor po larity selection (mon pol ) these monitors can be set to sink current instead of source current. they will then need to be terminated with a resistor to v cc3 and the induced voltage should not exceed 2.5v. if the outputs of these monitors are not needed, mon pol , txpwr mon , bias mon , and mod mon can all be left floating and the chip current co nsumption will be reduced by th e value of the monitor currents. 3.4 laser eye safety using this laser driver in the manner described herein do es not ensure that the result ing laser transmitter complies with established standards such as iec 825. users must take the necessary precautions to ensure that eye safety and other applicable standards are met. note that determining and implementing the level of fault tolerance required by the applications that this part is going into is the res ponsibility of the tran smitter designer and manufacturer since the application of this device cannot be controlled by mindspeed. 3.4.1 safety circuitry on the m02061-12 with disdly on pin 8, scb is internally bonded to ground so scb is always in a logic low state. when scb is high the outp, biasout and svcc outputs will not be disabled when fail asserts (fail goes high). the outputs are only disabled by making dis high. the fail output will also ignore much of the safety sens ing circuitry when scb is high. however, it will monitor the state of the window comparators at pin apc set . the bias current is controlled to nominally maintain the voltage at apc set to 1.3v. the threshold levels at the window comparators around apc set are specified by the parameters v bh and v bl as shown in the table below. this provides the same level of eye safety protection as our previous generation of laser drivers. the current sourced out of pin apc set is equal to the current into pin i pin sourced from the laser monitor photo diode. if th e laser is emitting excess power this will be reflected in the i pin current and the voltage at apc set will go high and the fail pin will assert. if i pin is not connected to the laser monitor photo diode then the voltage at apc set will fall and fail will assert. when scb is low, safety circuitry in the m02061 will disa ble the modulation and bias current and assert the fail output immediately upon detecting a fault condition. in addition, the supply voltage that sources the laser (sv cc or an external switch controlled by shdwn out ) will immediately go open circuit and prevent any curr ent from passing through the laser. fault conditions checked by the m02061 include shorts to ground or v cc of all pins which can increase the laser modulation or bias current. for an initialization sequence to be successful, all the fault detection monitors must signal that the chip is ?healthy?. when dis goes low, pins are checked for shorts to ground or v cc and a fail condition is latched if there is a fault. if the state of the pins is ok, a one-sh ot at the reset pin begins a countdown which will latch a fail condition if the bias current has not stabilized to an a cceptable level during the one-shot time. the one-shot can be extended with an external capacitor connected from the reset pin to ground. the one-shot 1 width is approximately: 1.the one-shot is actually compris ed of an oscillator and 10-bit counter.
functional description 02061-dsh-001-g mindspeed technologies ? 31 mindspeed proprietary and confidential t one-shot = 3 ms + (0.3 ms/pf) x (external capacitance). 3.5 fault conditions when scb is low this section describes the m02061 operating modes dur ing fault conditions. over voltage, under voltage, pins shorted to v cc and pins shorted to ground are included in the fault table. figure 3-8. safety circuit block diagram, for scb pin low table 3-3. circuit response to single-poi nt fault conditions, when scb is low 1 2 (1 of 2) pin name circuit response to over-voltage condition or short to v cc circuit response to under-voltage condition or short to ground v cc bias and modulation outputs are disabled once v cc rises above the supply detection (high voltage) threshold bias and modulation outputs are disabled once v cc drops below the supply detection (low voltage) threshold din+, din- the apc loop will attempt to compensate for the change in output power. if the apc loop can not maintain the set average power, a fault state occurs. (1, 2) the apc loop will attempt to compensate for the change in output power. if the apc loop can not maintain the set average power, a fault state occurs. (1, 2) vcc3 sel does not affect laser power. d oes not affect laser power. vcc pin 5v hi/lo limits vcc3 pin 3.3v hi/lo limits 5v mode: and vcc3 pin 3.3v hi/lo limits 3.3v mode: and ?1? vcc pin 5v hi/lo limits vccok detection: vcc pin 5v hi/lo limits vcc3 pin 3.3v hi/lo limits 5v mode: and vcc pin 5v hi/lo limits vcc pin 5v hi/lo limits vcc3 pin 3.3v hi/lo limits vcc3 pin 3.3v hi/lo limits 5v mode: and and vcc3 pin 3.3v hi/lo limits 3.3v mode: and ?1? vcc pin 5v hi/lo limits vcc3 pin 3.3v hi/lo limits vcc3 pin 3.3v hi/lo limits 3.3v mode: and ?1? and ?1? vcc pin 5v hi/lo limits vcc pin 5v hi/lo limits vccok detection: crudefaults detection: outp capc modset ibout > 300mv > 300mv > 300mv > 300mv delay set _ srlatch : q reset one-shot: start start start 3ms + tcap t=0 pulse note: pulse stays high if reset pin is gnded . reset optional cap for longer t_init and and and window compare: hi limit mpcset low limit or or or set _ srlatch : q reset and and and and and and and and and biasok detection: output_enable vcc_ok crudefaults_ok bias_ok latch for crudefaults latch for bias_ok if chip is ?healthy?, then enable the outputs and start 3msec reset pulse(one-shot) (open-collector) failout (open-collector) failout or or dis
functional description 02061-dsh-001-g mindspeed technologies ? 32 mindspeed proprietary and confidential dis bias and modulation outputs are disabled. 3.3v operation - sv cc is opened. 5v operation - shdwn out goes high. does not affect laser power (normal condition for circuit operation). fail does not affect laser power . does not affect laser power. reset does not affect laser power . does not affect laser power. mod mon does not affect laser power. d oes not affect laser power. bias mon does not affect laser power. d oes not affect laser power. txpwr mon does not affect laser power. d oes not affect laser power. apc set a fault state occurs. (1) a fault state occurs. (1) i pin a fault state occurs. (1) a fault state occurs. (1) ibias out the laser will be turned off, then a fault state occurs. (1) a fault state occurs. (1) out p laser modulation is prevented; the apc loop will increase the bias current to compensate for the drop in laser power if it is dc coupled. if the set output power can not be obtained, a fault state occurs. (1, 2) a fault state occurs. (1) out n does not affect laser power. d oes not affect laser power. sv cc does not affect laser power. laser bias current will be shut off and a fault state occurs. (1) c apc laser bias current will be shut off, then a fault state occurs. (1) a fault state occurs. (1) v cc3 bias and modulation outputs are disabled once v cc3 rises above the supply detection (high voltage) threshold bias and modulation outputs are disabled once v cc3 drops below the supply detection (low voltage) threshold pwa does not affect laser power . does not affect laser power shdwn out does not affect laser power. if th is pin is used to control an external switch, laser current is disabled and fault state occurs. (1) does not affect laser power. mod set the apc loop will attempt to compensate for the change in output power. if the apc loop can not maintain the set average power, a fault state occurs. (1, 2) a fault state occurs. (1) tc slope does not affect laser power. may affect laser power. if this is the case, the apc loop will attempt to compensate for the change in output power. if the apc loop can not maintain the set average power, a fault state occurs. (1, 2) scb does not affect laser power . does not affect laser power. disdly does not affect laser pow er. does not affect laser power. notes: 1. a fault state will assert the fail output, disable bias and modulation outputs and will either open the switch at sv cc (3.3v operation) or shdwn out will go high (5v operation). 2. does not affect laser power when th e output is ac coupled to the laser. table 3-3. circuit response to single-poi nt fault conditions, when scb is low 1 2 (2 of 2) pin name circuit response to over-voltage condition or short to v cc circuit response to under-voltage condition or short to ground
02061-dsh-001-g mindspeed technologies ? 33 mindspeed proprietary and confidential 4.0 applications information 4.1 general ? sfp and sff modules ? 1g/2g/4g fibre channel modules ? short reach and metro sonet/sdh figure 4-1 and figure 4-2 illustrate typical applications for 3. 3/ac coupled and 5v/dc coupled laser. figure 4-1. application diagram, v cc = 3.3v laser ac coupled example input buffer v cc3 -1.3v internal 3.3v reg. input buffer d - ff output buffer laser driver automatic power control (laser bias current) safety circuitry with latched fault modulation control v cc v cc3 fail vcc3 sel pwa shdwn out sv cc out- out+ gnd 0 ibias out ipin dis mod set tc slope mod mon reset bias mon apc set c apc txp wr mon d in - d in + internal power bus v cc3 v cc v cc 3 v cc v cc scb disdly (m02061-12 only) (m02061-21 only) tx disable v cc v cc 100k
applications information 02061-dsh-001-g mindspeed technologies ? 34 mindspeed proprietary and confidential 4.2 video operation the m02061 can be used to transmit digital video optical data even in the presence of the pathological signal. this is done by fully dc coupling the signal from the input to the laser output.in most data communications applications, ac coupling occurs at 3 points in a laser driver schematic: the data inputs, the apc control, and coupling the modulation current to the laser. in the m02061 dc coupling can be used at all 3 of these points.the data inputs can be dc coupled using pecl or cml levels (see section 3.3.3, ?data inputs? ). lvds signals can be dc coupled with level shifting.the apc of the bias current is controlled by feedback from the monitor photo diode in the laser package in most communications applications. in video app lications this monitor photo diode should not be used if the pathological pattern may occur. instead, the apc should be controlled in an ?open loop? configuration. (open loop simply means a monitor photo diode is not used). in the open loop configuration the apc is controlled by a resistor or a thermistor network or a look-up table. this removes ac time constants from the bias current. in figure 4-3 the biasmon pin is connected to the apcset pin. in this case the bias current is ibias = 100 x (1.3v / rapcset). the modulation current output out+ can be dc coupled to the laser as shown in figure 4-3 . there are no ac time constants in the modulation current amplitude in this configuration. figure 4-2. application diagram, v cc = 5v laser dc coupled example input buffer v cc3 -1.3v internal 3.3v reg. input buffer d - ff output buffer laser driver automatic power control (laser bias current) safety circuitry with latched fault modulation control v cc v cc3 fail vcc3 sel pwa shdwn ou t sv cc out- out+ gnd 0 ibias out ipin dis mod set tc slop e mo d mon reset bias mon apc set c apc txpwr mon d in - d in + internal power bus v cc3 v cc =5v v cc v cc3 v cc3 v cc scb disdly (m02061-12 only) (m02061-21 only) tx disable spst switch
applications information 02061-dsh-001-g mindspeed technologies ? 35 mindspeed proprietary and confidential figure 4-3. video application block diagram input buffer v cc3 -1.3v internal 3.3v reg. input buffer d - ff output buffer automatic power control (laser bias current) safety circuitry with latched fault modulation control v cc v cc3 fail vcc3 sel pwa shdwn ou t sv cc out- out+ gnd 0 ibias out ipin dis mod set tc sl o p e mo d mon reset bias mon apc set c apc txpwr mon d in - d in + internal power bus v cc3 v cc =5v v cc v cc3 v cc3 v cc scb disdly (m02061-12 only) (m02061-21 only) tx disable spst switch laser driver
02061-dsh-001-g mindspeed technologies ? 36 mindspeed proprietary and confidential 5.0 package specification figure 5-1. qfn24 package information note: view is for a 20 pin package. all dimensions in the tables apply for the 24 pin package
www.mindspeed.com general information: telephone: (949) 579-3000 headquarters - newport beach 4000 macarthur blvd., east tower newport beach, ca 92660 ? 2012 mindspeed technologies ? , inc. all rights reserved. information in this document is provided in connection with mindspeed technologies ? ("mindspeed ? ") products. these materials are provided by mindspeed as a service to its customers and may be used for informational purposes only. except as provided in mindspeed?s terms and conditions of sale for such products or in any separate agreement related to this document, mindspeed assumes no liability whatsoever. mindspeed assumes no responsibility for errors or omission s in these materials. mindspeed may make changes to specifications and product descriptions at any time, without notice. mindspeed makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incom patibilities arising from future changes to its specifications and product descriptions. no license, ex press or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. these materials are provided "as is" withou t warranty of any kind, either express or implied, relating to sale and/or use of mindspeed products including liability or warranties relating to fitness for a particular purpose, consequential or incidental damages, merchantability, or infringement of any patent, copyright or other intellectual property right. mindspeed further does not warrant the accuracy or completeness of the information, text, graph ics or other items contained within these materials. mindspeed shall not be liable fo r any special, indirect, incidental, or consequential damages, including without li mitation, lost revenues or lost profits, which may result from the use of these materials. mindspeed products are not intended for use in medical, lifesaving or life sustaining applications. mindspeed customers using or selling mindspeed pr oducts for use in such applications do so at their own risk and agree to fully indemnify mindspeed for any damages resulting from such improper use or sale. 02061-dsh-001-g mindspeed technologies ? 37 mindspeed proprietary and confidential

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