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single supply, high speed, rail - to - rail output, triple op a mp data sheet ada4855 - 3 rev. a document feedback information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rig hts of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 ? 2008 C 2013 analog devices, inc. all rights reserved. technical support www.analog.com features voltage feedback architecture rail - to - rail output swing : 0.1 v to 4. 9 v high speed amplifiers 4 1 0 mhz, ?3 db bandwidth, g = 1 210 mhz, ?3 db bandwidth, g = 2 slew rate: 8 7 0 v/s 5 3 mhz, 0.1 db large signal flatness 5.3 ns settling time to 0. 1% wit h 2 v step high input common - mode voltage range ?v s ? 0.2 v to +v s ? 1 v supply range: 3 v to 5 .5 v differential gain error: 0.01% differential phase error: 0.01 low power 7. 8 ma/amplifier typical supply current power - down feature available in 16 - lead l fcsp applications professional v ideo consumer v ideo imaging instrumentation base stations active f ilters connection diagram 07685-001 notes 1. nc = no connect. 2. exposed pad connected to ?v s . 1 2 +in2 nc +in3 ?in3 out3 ?v s +in1 ?in1 out1 ?v s pd nc 3 4 11 out2 12 +v s 10 ?in2 9 5 6 7 8 16 15 14 13 +v s ada4855-3 figure 1. general description the ada4855 - 3 (triple) is a single - supply, rail - to - rail output operati onal amplifier. it provides excellent high speed performance with 4 1 0 mhz, ?3 db bandwidth and a slew rate of 8 7 0 v/s. it has a wide input common - mode voltage range that extends from 0.2 v below ground to 1 v below the positive rail.in addition, the output voltage swings within 1 00 mv of either supply rail, making this rail - to - r ail operational amplifier easy to use on single - supply voltages as low as 3.3 v. the ada4855 - 3 offers a typical low power of 7. 8 ma per amplifier and is capable of delivering up to 57 ma of load current. it also features a power - down function for power se nsitive applications that reduces the supply current down to 1 ma. the ada4855 - 3 is available in a 16 - lead lfcsp and is designed to work over the extended industrial temperature range of ?40c to +105c. 1 0 ?1 ?2 ?3 ?4 ?5 ?6 1 10 normalized closed-loo p gain (db) frequenc y (mhz) 100 1000 07685-004 g = 2 g = 5 g = 1 figure 2. frequency response
ada4855-3* product page quick links last content update: 11/01/2016 comparable parts view a parametric search of comparable parts evaluation kits ? ada4855-3 evaluation board documentation application notes ? an-402: replacing output clamping op amps with input clamping amps ? an-417: fast rail-to-rail operational amplifiers ease design constraints in low voltage high speed systems ? an-581: biasing and decoupling op amps in single supply applications data sheet ? ada4855-3: single supply, high speed, rail-to-rail output, triple op amp data sheet user guides ? ug-115: universal evaluation board for triple, high speed op amps offered in 16-lead, 4 mm 4 mm lfcsp packages tools and simulations ? analog filter wizard ? analog photodiode wizard ? power dissipation vs die temp ? vrms/dbm/dbu/dbv calculators ? ada4855 spice macro model reference materials tutorials ? mt-032: ideal voltage feedback (vfb) op amp ? mt-033: voltage feedback op amp gain and bandwidth ? mt-047: op amp noise ? mt-048: op amp noise relationships: 1/f noise, rms noise, and equivalent noise bandwidth ? mt-049: op amp total output noise calculations for single-pole system ? mt-050: op amp total output noise calculations for second-order system ? mt-052: op amp noise figure: don't be misled ? mt-053: op amp distortion: hd, thd, thd + n, imd, sfdr, mtpr ? mt-056: high speed voltage feedback op amps ? mt-058: effects of feedback capacitance on vfb and cfb op amps ? mt-059: compensating for the effects of input capacitance on vfb and cfb op amps used in current-to-voltage converters ? mt-060: choosing between voltage feedback and current feedback op amps design resources ? ada4855-3 material declaration ? pcn-pdn information ? quality and reliability ? symbols and footprints discussions view all ada4855-3 engineerzone discussions sample and buy visit the product page to see pricing options technical support submit a technical question or find your regional support number * this page was dynamically generated by analog devices, inc. and inserted into this data sheet. note: dynamic changes to the content on this page does not constitute a change to the revision number of the product data sheet. this content may be frequently modified.
ada4855- 3 data sheet rev. a | page 2 of 20 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 connection diagram ....................................................................... 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 5 v operation ............................................................................... 3 3.3 v operation ............................................................................ 4 absolute maximum ratings ............................................................ 5 thermal resistance ...................................................................... 5 maximum power dissipation ..................................................... 5 esd caution .................................................................................. 5 pin configuration and function descriptions ............................. 6 typical performance characteristics ............................................. 7 test circuits ..................................................................................... 13 theory of operation ...................................................................... 14 applic ations information .............................................................. 15 gain configurations .................................................................. 15 20 mhz active low - pass filter ................................................ 15 rgb video driver ...................................................................... 16 driving multiple video loads .................................................. 16 pd (power - down) pin .............................................................. 16 single - supply operation ........................................................... 17 power supply bypassing ............................................................ 17 layout .......................................................................................... 17 outline dimensions ....................................................................... 18 ordering guide .......................................................................... 18 revision history 2 / 13 rev. 0 to rev. a change cp - 16 - 4 package to cp - 26- 23, figure 1 .......................... 1 change cp - 16 - 4 package to cp - 26- 23, figure 4 .......................... 6 updated outline dimensions ....................................................... 1 8 changes to ordering guide .......................................................... 1 8 1 1 /08 revision 0: initial version
data sheet ada4855- 3 rev. a | page 3 of 20 specifications 5 v operation t a = 25c, v s = 5 v, g = 1, r l = 150 ?, unless otherwise noted. table 1 . parameter test conditions min typ max unit dynamic performance ?3 db bandwidth v o = 0. 1 v p -p 4 1 0 mhz v o = 2 v p -p 2 0 0 mhz v o = 0. 1 v p -p , g = 2 210 mhz v o = 2 v p -p , g = 2 1 20 mhz bandwidth for 0.1 db flatness v o = 2 v p -p 5 3 mhz v o = 2 v p -p , g = 2 5 0 mhz slew rate v o = 2 v step 8 70 v/s settling time to 0. 1% v o = 2 v step ( rise/fall) 5.3/9.5 ns v o = 2 v step ( rise/fall) , g = 2 7.4/7 ns noise /distortion performance harmonic distortion (hd2 / hd3) f c = 5 mhz, v o = 2 v p - p , r l = 1 k ? ?84/?105 dbc f c = 20 mhz, v o = 2 v p -p , r l = 1 k? ?60/?66 dbc crosstalk, output to output f = 5 mhz, g = 2 ? 90 dbc input voltage noise f = 100 khz 6.8 nv/hz input current noise f = 100 khz 2 pa/hz differential gain error g = 2 0.01 % differential phase error g = 2 0.01 degrees dc performance input offset voltage 1 .3 3 mv input offset voltage drift 5.5 v/c input bias current ? 3.8 a input offset current 0.05 a open - loop gain v o = 0.5 v t o 4.5 v 9 2 db input characteristics input resistance 6.4 m? input capacitance 0.5 pf input common - mode voltage range ? v s ? 0.2 + v s ? 1 v common - mode rejection ratio v cm = C 0.2 v to +4 v 94 db output characteristics outp ut voltage swing 0.1 to 4. 9 v linear output current p er amplifier hd2 ?60 dbc , r l = 10 ? 57 ma power - down turn - on time 78 ns turn - off time 1 .2 s bias current on 0.3 a off ? 125 a turn - o n voltage +v s ? 1.25 v power supply operating range 3 5.5 v quiescent current per amplifier 7. 8 ma supply current w hen powered down 1 .1 ma power supply rejection ratio ?v s = 4.5 v to 5 .5 v 96 db
ada4855- 3 data sheet rev. a | page 4 of 20 3.3 v operation t a = 25c, v s = 3. 3 v, g = 1, r l = 150 ? , un less otherwise noted. table 2 . parameter test conditions min typ max unit dynamic performance ?3 db bandwidth v o = 0. 1 v p -p 430 mhz v o = 1.4 v p -p 210 mhz v o = 0. 1 v p -p , g = 2 210 mhz v o = 2 v p -p , g = 2 125 mhz bandwidth for 0.1 db flatness v o = 1.4 v p -p , g = 2 5 5 mhz slew rate v o = 2 v step , g = 2 870 v/s settling time to 0. 1% v o = 2 v step ( rise/fall ) , g = 2 7.4/7.1 ns noise/distortion performance harmonic distortion (hd2 / h d3) f c = 5 mhz, v o = 2 v p - p, r l = 1 k? ?76/?76 dbc f c = 20 mhz, v o = 2 v p -p , r l = 1 k? ?68/? 75 dbc crosstalk, output to output f = 5 mhz, g = 2 ?88 dbc input voltage noise f = 100 khz 6.8 nv/hz input current noise f = 100 khz 2 pa/hz differential gain error g = 2 0.01 % differential phase error g = 2 0.01 degrees dc performance input offset voltage 1.3 mv input offset voltage drift 5.5 v/c input bias current ? 3.8 a input offset current 0.05 a open - loop gain v o = 0.5 v to 4.5 v 92 db input characteristics input resistance 6.4 m? input capacitance 0.5 pf input common - mode voltage range ?v s ? 0.2 +v s ? 1 v common - mode rejection ratio v cm = C 0.2 v to +3.2 v 94 db output characteristics output voltage swing 0.1 to 3.22 v linear output current p er amplifier hd2 ?60 dbc , r l = 10 ? 40 ma power - down turn - on time 78 n s turn - off time 1.2 s turn - on voltage +v s ? 1.25 v power supply operating range 3 5.5 v quiescent current per amplifier 7.5 ma supply current w hen powered down 0.95 m a power supply rejection ratio ?v s = 2.97 v to 3. 63 v 94 db
data sheet ada4855- 3 rev. a | page 5 of 20 absolute maximum rat ings table 3 . parameter rating supply voltage 6 v internal power dissipation 1 see figure 3 common - mode input voltage (?v s ? 0.2 v) to (+v s ? 1 v) differential input voltage v s output short - circuit duration observe power curves storage temperature rang e ?65 c to +125 c operating temperature range ?40 c to +105 c lead temperature (soldering, 10 sec) 300c 1 specification is for device in free air. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. thi s is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may af fect device reliability. thermal resistance ja is specified for the worst - case conditions, that is, ja is spec i fied for a device soldered in a circuit board for surface - mount packages. table 4 . package type ja jc unit 16- lead lfcsp 67 17.5 c/w maximum power dissip at ion the maximum power that can be safely dissipated by the ad a4855 - 3 is limited by the associated rise in junction temperature. the maximum safe junction temperature for plastic encapsulated devices is determined by the glass transition temperature of the plastic, approximately 150 c. temporarily exceeding this limit may cause a shift in parametric performance due to a change in the stresses exerted on the die by the package. exceeding a junction temperature of 175 c for an extended period can result in dev ice failure. to ensure proper operation, it is necessary to observe the maximum power derating curves. 3.0 2.5 2.0 1.5 1.0 0.5 0 07685-103 maximum power dissipation (w) ambient temperature (c) ?40 ?30 ?20 ?10 0 10 20 30 40 50 60 70 80 90 100 figure 3 . maximum power dissipation vs. ambient temperature esd caution
ada4855- 3 d ata sheet rev. a | page 6 of 20 pin configuration an d function descripti ons 07685-003 notes 1. nc = no connect. 2. exposed pad connected to ?v s . 1 2 +in2 nc +in3 ?in3 out3 ?v s +in1 ?in1 out1 ?v s pd nc 3 4 11 out2 12 +v s 10 ?in2 9 5 6 7 8 16 15 14 13 +v s ada4855-3 figure 4. pin configuration table 5 . pin function descriptions pin o. nemonic description 1 nc no connect . 2 +in2 noninverting input 2 . 3 nc no connect . 4 pd power down . 5 +in3 n oninverting input 3 . 6 ?in3 inverting input 3 . 7 out3 output 3 . 8 ?v s negative supply . 9 +v s positive supply . 10 ?in2 inverting input 2 . 11 out2 output 2 . 12 +v s positive supply . 13 ?v s negative supply . 14 o ut 1 output 1 . 15 ?in1 inverting input 1 . 16 +in1 noninverting input 1 . 17 (epad) exposed pad ( epad ) the e xposed p ad m ust be connected to ?v s .
data sheet ada4855- 3 rev. a | page 7 of 20 typical performance characteristics t = 25c, v s = 5 v, g = 1, r f = 1 k? for g > 1, r l = 150 ?, small signal v out = 100 mv p - p, and large signal v out = 2 v p - p, unless otherwise noted. 1 0 ?1 ?2 ?3 ?4 ?5 ?6 1 10 normalized closed-loo p gain (db) frequenc y (mhz) 100 1000 07685-004 g = 2 g = 5 g = 1 figure 5 . small signal frequency response vs. gain 1 0 ?1 ?2 ?3 ?4 ?5 ?6 1 10 normalized closed-loo p gain (db) frequenc y (mhz) 100 1000 07685-005 g = 5 g = 2 g = 1 v s = 3.3v figure 6 . small signal frequency response vs. gain 1 0 ?1 ?2 ?3 ?4 ?5 ?6 1 10 closed-loo p gain (db) frequenc y (mhz) 100 1000 07685-006 r l = 150? r l = 1k? figure 7 . small signal frequ ency response vs. load 1 0 ?1 ?2 ?3 ?4 ?5 ?6 1 10 normalized closed-loo p gain (db) frequenc y (mhz) 100 1000 07685-007 g = 2 g = 5 g = 1 figure 8 . large signal frequency response vs. gain 1 0 ?1 ?2 ?3 ?4 ?5 ?6 1 10 normalized closed-loo p gain (db) frequenc y (mhz) 100 1000 07685-008 g = 2 v out = 2v p-p g = 5 v out = 2v p-p g = 1 v out = 1.4v p-p v s = 3.3v figure 9 . large signal frequency response vs. gain 1 0 ?1 ?2 ?3 ?4 ?5 ?6 1 10 closed-loo p gain (db) frequenc y (mhz) 100 1000 07685-009 c f = 6.6pf c f = 2.2pf c f = 4.4pf figure 10 . small signal frequency respon se vs. capacitive load
ada4855-3 data sheet rev. a | page 8 of 20 ?0.5 ?0.4 ?0.3 ?0.2 ?0.1 0 0.1 0.2 1 10 100 1000 closed-loop gain (db) frequency (mhz) 07685-037 v s = 5v, v out = 2v p-p v s = 3.3v, v out = 1.4v p-p figure 11. 0.1 db flatness vs. supply voltage ?6 ?5 ?4 ?3 ?2 ?1 0 1 1 10 100 1000 closed-loop gain (db) frequency (mhz) t a = +25c t a = +85c t a = +105c t a = ?40c 07685-038 figure 12. small signal frequency response vs. temperature ?90 ?85 ?80 ?75 ?70 ?65 ?60 ?55 ? 50 0.1 1 10 40 distortion (dbc) frequency (mhz) 07685-014 v out = 1v p-p v s = 3.3v r l = 1k ? hd3 hd2 figure 13. harmonic distortion vs. frequency 5.5 5.6 5.7 5.8 5.9 6.0 6.1 6.2 1 10 100 1000 closed-loop gain (db) frequency (mhz) v s = 5v v s = 3.3v g= 2 07685-040 figure 14. 0.1 db flatness vs. supply voltage 07685-035 100 50 75 0 25 ?300 0 ?200 ?150 ?100 ?50 ?250 ?50 ?25 10 100 1k 10k 100k 1m 10m 100m 1g 10g phase (degrees) gain (db) frequency (hz) phase gain figure 15. open-loop gain and phase vs. frequency ?130 ?120 ?110 ?100 ?90 ?80 ?70 ?60 ? 50 0.1 1 10 40 distortion (dbc) frequency (mhz) hd2 hd3 v out = 1v p-p r l = 1k ? 07685-011 figure 16. harmonic distortion vs. frequency
data sheet ada4855- 3 rev. a | page 9 of 20 ?120 ?100 ?80 ?60 ?40 ?20 0 0.1 1 10 100 1000 forward isolation (db) frequency (mhz) 07685-012 out1 out2 out3 figure 17 . forward isolation vs. frequency ?100 ?90 ?80 ?70 ?60 ?50 ?40 ?30 ?20 ?10 0 0.0 1 0. 1 1 1 0 10 0 psrr (db) f re q ue nc y ( m hz ) ?psrr +psrr 07685-013 figure 18 . power supply rejection ratio (psrr) vs. frequency 1 0 10 0 1k 10k 100k 1m 10m c u rr en t n o is e (p a /h z ) f r eq u enc y ( h z ) 10 0 1 0 1 07685-020 figure 19 . input current noise vs. frequency ?12 0 ?11 0 ?10 0 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 1 1 0 frequency (mhz) crosstalk (db) 10 0 100 0 07685-015 i n 1 , i n 2 , o u t 3 i n 2 , i n 3 , o u t 1 i n 1 , i n 3 , o u t 2 figure 20 . crosstalk vs. frequency ?10 0 ?9 0 ?8 0 ?7 0 ?6 0 ?5 0 ?4 0 ?3 0 0.01 0.1 1 10 100 cm rr (d b) f re q ue nc y ( m hz ) 07685-016 figure 21 . common - mode rejection ratio (cmrr) vs. frequency 1 0 10 0 1k 10k 100k 1m voltage noise (nv/hz) frequency (hz) 10 0 1 0 1 07685-017 v s = 3.3v v s = 5v figure 22 . input voltage noise vs. frequency
ada4855- 3 data sheet rev. a | page 10 of 20 ?0.08 ?0.04 ?0.06 ?0.02 0 0.02 0.04 0.06 0.08 output voltage (v) time (10ns/div) 07685-018 v s = 5v v s = 3.3v figure 23 . small signal transie nt response vs. supply voltage ?0.08 ?0.06 ?0.04 ?0.02 0 0.02 0.04 0.06 0.08 output voltage (v) time (10ns/div) 07685-019 c l = 2.2pf c l = 4.4pf c l = 6.6pf figure 24 . small signal transient response vs. capacitive load ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 output voltage (v) time (10ns/div) 07685-021 r l = 1k? r l = 150? figure 25 . large signal transient response vs. load resistance ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 output voltage (v) time (10ns/div) 07685-022 c l = 2.2pf c l = 4.4pf c l = 6.6pf figure 26 . large signal transient response vs. capacitive load ?0.08 ?0.06 ?0.04 ?0.02 0 0.02 0.04 0.06 0.08 output voltage (v) time (10ns/div) 07685-023 c l = 2.2pf c l = 4.4pf c l = 6.6pf v s = 3.3v figure 27 . small signal transient response vs. capacitive load 23.7 23.2 22.7 22.2 2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 supp l y vo lt age (v) quiescent current (ma) 4.3 4.7 4.9 5.3 5.5 4.5 5.1 21.7 07685-029 figure 28 . quiescent current vs. supply voltage
data sheet ada4855-3 rev. a | page 11 of 20 ?4 ?3 ?2 ?1 0 1 2 3 4 voltage (v) time (50ns/div) g = 2 v out 2 v in 07685-025 figure 29. output overdrive recovery ?0.6 ?0.4 ?0.2 0 0.2 0.4 0.6 output voltage (v) time (10ns/div) 07685-026 c l = 2.2pf c l = 4.4pf c l = 6.6pf v out = 1v p-p v s = 3.3v figure 30. large signal transient response vs. capacitive load 07685-024 time (2ns/div) settling time (%) 0.5 0.4 0.3 0.2 0.1 0 ?0.1 ?0.2 ?0.3 ?0.4 ?0.5 error input figure 31. settling time ?2.5 ?2.0 ?1.5 ?1.0 ?0.5 0 1.0 2.0 0.5 1.5 2.5 voltage (v) time (50ns/div) v out 2 v in 07685-028 g = 2 v in = 3.3v figure 32. output overdrive recovery ?2.0 ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 2.0 ?3 ?2 ?1 0 1 2 3 output voltage (v) power-down voltage (v) time (1s/div) 07685-129 v pd v out figure 33. turn-on/turn-off time 07685-027 time (2ns/div) settling time (%) 0.5 0.4 0.3 0.2 0.1 0 ?0.1 ?0.2 ?0.3 ?0.4 ?0.5 error input v s = 3.3v figure 34. settling time
ada4855- 3 data sheet rev. a | page 12 of 20 ?60 ?50 ?40 ?30 ?20 ?10 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 offset voltage (mv) common-mode voltage (v) 07685-031 v s = 3.3v v s = 5v figure 35 . input offset voltage vs. common - mode voltage 23.6 23.4 23.0 22.6 23.2 22.8 22.2 22.4 22.0 ?40 ?25 ?10 5 20 temper a ture (c) quiescent current (ma) 35 65 80 1 10 125 50 95 21.8 07685-032 v s = 5v v s = 3.3v figure 36 . quiescent curre nt vs. temperature 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 ?40 ?20 0 20 40 60 80 100 offset voltage (mv) temperature (c) 07685-034 figure 37 . offset drift vs. temperature 0.01 0.1 1 10 100 0.1 1 10 100 1000 output impedance (?) frequency (mhz) 07685-036 figure 38 . output impedance vs. frequency 4.60 4.65 4.70 4.75 4.80 4.85 4.90 4.95 5.00 0.01 0.1 1 10 100 saturation voltage (mv) load current (ma) 07685-039 figure 39 . output saturation voltage vs. load current
data sheet ada4855- 3 rev. a | page 13 of 20 tes t circuits v in v out 0.1f 0.1f 0.1f 10f +v s ?v s 49.9? r l + 10f 07685-041 + figure 40 . noninverting load configuration v out 0.1f 49.9? +v s ?v s r l 10f + ac 07685-042 figure 41 . positive power supply rejection v in v out 0.1f 0.1f 0.1f 10f +v s ?v s r g r f 49.9? r l c l + 10f 07685-043 + figure 42 . typical capacitive load configuration v in v out 0.1f 0.1f 0.1f 10f +v s ?v s 1k? 1k? 1k? 1k? 53.6? r l + 10f + 07685-044 figure 43 . common - mode rejection 0.1f v out +v s ?v s r l 10f + ac 49.9? 07685-045 figure 44 . negative power supply rejection v in v out 0.1f 0.1f 0.1f 10f +v s ?v s r g r f 49.9? r l + 10f 07685-046 + figure 45 . typical n oninverting gain configuration
ada4855-3 data sheet rev. a | page 14 of 20 theory of operation the ada4855-3 is a voltage feedback op amp that employs a new input stage that achieves a high slew rate while maintaining a wide common-mode input range. the input common-mode range of the ada4855-3 extends from 200 mv below the negative rail to 1 v below the positive rail. this feature makes the ada4855-3 ideal for single-supply applications. in addition, this new input stage does not sacrifice noise performance for slew rate. at 6.8 nv/hz, the ada4855-3 is one of the lowest noise rail-to-rail output video amplifiers in the market. besides a novel input stage, the ada4855-3 employs the analog devices, inc., patented rail-to-rail output stage. this output stage makes efficient use of the power supplies, allowing the op amp to drive up to three video loads to within 350 mv of the positive power rail. in addition, this output stage provides the amplifier with very fast overdrive characteristics, which is an important property in video applications. the ada4855-3 comes in a 16-lead lfcsp that has an exposed thermal pad for lower operating temperature. this pad is internally connected to the negative rail. to avoid printed circuit board (pcb) layout problems, the ada4855-3 features a new pinout flow that is optimized for video applications. as shown in figure 4, the noninverting input and output pins of each amplifier are adjacent to each other for ease of layout. the ada4855-3 is fabricated in analog devices dielectrically isolated extra fast complementary bipolar 3 (xfcb3) process, which results in the outstanding speed and dynamic range displayed by the amplifier. out +in ?in c c 1 ?v s g m1 g m2 + v s r 07685-147 figure 46. high level design schematic
data sheet ada4855- 3 rev. a | page 15 of 2 0 applications informa tion gain configurations the ada4855 - 3 is a single - supply, high speed, voltage feedback amplifier . table 6 provides a convenient reference for quickly determining the feedback and gain set resistor values and bandwidth for common gain configurations. table 6 . recommended values and frequency performance 1 gain r f r g ?3 db ss bw (mhz) large signal 0.1 db flatness (mhz) 1 0 ? n/a 200 53 2 1 k ? 1 k ? 120 50 5 1 k ? 200 ? 45 6 1 conditions: v s = 5 v, t a = 25c, r l = 150 ?. figure 47 and figure 48 show the typical noninverting and inverting configurations and recommended bypass capacitor values. 0.1f 10f ?v s v in v out 10f 0.1f 0.1f +v s ada4855-3 ? + r g r f 07685-047 figure 47 . noninverting gain configuration 0.1f 10f ?v s v in v out 10f 0.1f 0.1f +v s ada4855-3 + ? r g r f 07685-048 figure 48 . inverting gain configur ation 2 0 mh z active low - pass filter the ada48 55- 3 triple amplifier lends itself to higher order active filters. figure 49 shows a 2 0 mhz, 6 - pole, sallen - key low - pass filter. v in u1 op amp out1 + ? r1 232 r2 1.69k c2 6.6pf c1 15pf r8 261 r7 1k r9 1k u2 op amp out2 + ? r3 309? r4 1.87k? c4 4.3pf c3 15pf u3 op amp out3 + ? r5 261? r6 1.43k? c6 3pf c5 33pf 07685-049 v out r10 261 r11 1k r12 261 the filter has a gain of approximately 6 db and flat frequency response out to 1 4 mhz. this type of filter is commonly used at the output of a video dac as a reconstruction filter. the frequency response of the filter is sho wn in figure 50. 10 0 ?10 ?20 ?30 ?40 ?50 ?60 ?70 1 200 magnitude (db) 10 100 frequency (mhz) 07685-050 out1 out3 out2 figure 50 . 2 0 mhz , low - pass filter frequency response
ada4855-3 data sheet rev. a | page 16 of 20 rgb video driver figure 51 shows a typical rgb driver application using dual supplies. the gain of the amplifier is set at +2, where r f = r g = 1 k. the amplifier inputs are terminated with shunt 75 resistors, and the outputs have series 75 resistors for proper video matching. in figure 51, the pd pin is not shown connected to any signal source for simplicity. if the power-down function is not used, it is recommended that the pd pin be tied to the positive supply or be left floating (not connected). ada4855-3 07685-051 pd 16 15 14 13 5 6 7 8 12 11 10 9 1 2 3 4 0.1f 0.1f 0.1f 0.1f 10f 0.1f + 0.1f 10f + 75? 1k? 1k? 1k? 1k? 75? 75? 75 ? 1k ? 1k? 75 ? 75? ?v s ?v s +v s +v s v out (r) v in (r) v in (g) v in (b) v out (g) v out (b) figure 51. rgb video driver driving multiple video loads each amplifier in the ada4855-3 can drive up to three video loads simultaneously, as shown in figure 52. when driving three video loads, the ada4855-3 maintains its excellent performance for 0.1 db flatness and 3 db bandwidth. figure 53 shows the large signal frequency response of the ada4855-3 with three different load configurations: 150 , 75 and 50 . 07685-052 75? cable 75? cable 75 ? 75 ? 75 ? v out 2 v out 1 ?v s +v s v in 0.1f 0.1f 10f 10f 75 ? cable 75? 75 ? 75? cable 75 ? 75 ? v out 3 + ? r f 1k? r g 1k? ada4855-3 0.1f figure 52. video driver schematic for triple video loads 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 110100 m a gnitude (db) frequency (mhz) 200 r l =150 ? v out =2v p-p g = 2 r l =75 ? r l =50 ? 07685-153 figure 53. large signal frequency response vs. loads pd (power-down) pin the ada4855-3 is equipped with a pd (power-down) pin for all three amplifiers. this allows the user to reduce the quiescent supply current when an amplifier is inactive. the power-down threshold levels are derived from the voltage applied to the +v s pin. when used in single-supply applications, this is especially useful with conventional logic levels . the amplifier is enabled when the voltage applied to the pd pin is greater than +v s ? 1.25 v. in a single-supply application, the voltage threshold is typically +3.75 v, and in a 2.5 v dual- supply application, the voltage threshold is typically +1.25 v. the amplifier is also enabled when the pd pin is left floating (not connected). however, the amplifier is powered down when the voltage on the pd pin is lower than 2.5 v from +v s . if the pd pin is not used, it is best to connect it to the positive supply. table 7. power-down voltage control pd pin 5 v 2.5 v 3 v not active >3.75 v >1.25 v >1.75 v active <2 v <0 v <1 v
data sheet ada4855-3 rev. a | page 17 of 20 single-supply operation the ada4855-3 is designed for a single power supply. figure 54 shows the schematic for a single 5 v supply video driver. the input signal is ac-coupled into the amplifier via c1. resistor r2 and resistor r4 establish the input midsupply reference for the amplifier. c5 prevents constant current from being drawn through the gain set resistor. c6 is the output coupling capacitor. for more information on ac-coupled single-supply operation of op amps, see avoiding op-amp instability problems in single- supply applications , analog dialogue, volume 35, number 2, march-may, 2001, at www.analog.com . 07685-155 c2 1f r2 50k ? r4 50k ? r3 1k ? c1 22f u1 r1 75? r5 1k ? r6 1k? c6 220f r7 75 ? r8 75? c5 22f ada4855-3 5v v out v in ?v s c3 10f c4 0.01f 5 v figure 54. ac-coupled, single-s upply video driver schematic another way to configure the ada4855-3 in single-supply operation is dc-coupled. the common-mode input voltage can go ~200 mv below ground, which makes it a true single-supply amplifier. however, in video applications, the black level is set at 0 v, which means that the output of the amplifier must go to ground level as well. the ada4855-3 has a rail-to-rail output that can swing to within 100 mv from either rail. figure 55 shows the schematic for adding 50 mv dc offset to the input signal so that the output is not clipped while still properly terminating the input with 75 . 07685-156 r1 3.74k ? u1 r2 76.8 ? r3 1k? r4 1k? r5 75? r6 75? ada4855-3 5v v out v in ?v s c1 10f c2 0.1f 5 v figure 55. dc-coupled, single-s upply video driver schematic power supply bypassing careful attention must be paid to bypassing the power supply pins of the ada4855-3. high quality capacitors with low equivalent series resistance (esr), such as multilayer ceramic capacitors (mlccs), should be used to minimize supply voltage ripple and power dissipation. a large, usually tantalum, 2.2 f to 47 f capacitor located in close proximity to the ada4855-3 is required to provide good decoupling for lower frequency signals. the actual value is determined by the circuit transient and frequency requirements. in addition, 0.1 f mlcc decoupling capacitors should be located as close to each of the power supply pins and across both supplies as is physically possible, no more than 1/8-inch away. the ground returns should terminate immediately into the ground plane. locating the bypass capacitor return close to the load return minimizes ground loops and improves performance. layout as is the case with all high speed applications, careful attention to printed circuit board (pcb) layout details prevents associated board parasitics from becoming problematic. the ada4855-3 can operate at up to 410 mhz; therefore, proper rf design techniques must be employed. the pcb should have a ground plane covering all unused portions of the component side of the board to provide a low impedance return path. removing the ground plane on all layers from the area near and under the input and output pins reduces stray capacitance. signal lines connecting the feedback and gain resistors should be kept as short as possible to minimize the inductance and stray capacitance associated with these traces. termination resistors and loads should be located as close as possible to their respective inputs and outputs. input and output traces should be kept as far apart as possible to minimize coupling (crosstalk) through the board. adherence to microstrip or stripline design techniques for long signal traces (greater than 1 inch) is recommended. for more information on high speed board layout, see a practical guide to high-speed printed-circuit-board layout , analog dialogue, volume 39, september 2005, at www.analog.com .
ada4855-3 data sheet rev. a | page 18 of 20 outline dimensions compliant to jedec standards mo-220-wggc. 111908-a 1 0.65 bsc bottom view top view 16 5 8 9 12 13 4 exposed pad p i n 1 i n d i c a t o r 4.10 4.00 sq 3.90 0.70 0.60 0.50 seating plane 0.80 0.75 0.70 0.05 max 0.02 nom 0.20 ref 0.25 min coplanarity 0.08 pin 1 indi c ator 0.35 0.30 0.25 2.25 2.10 sq 1.95 for proper connection of the exposed pad, refer to the pin configuration and function descriptions section of this data sheet. figure 56.16-lead lead frame chip scale package [lfcsp_wq] 4 mm 4 mm body, very very thin quad (cp-16-23) dimensions shown in millimeters ordering guide model 1 temperature range package description package option ordering quantity ada4855-3ycpz-r2 C40c to +105c 16-lead lfcsp_wq cp-16-23 250 ada4855-3ycpz-r7 C40c to +105c 16-lead lfcsp_wq cp-16-23 1,500 ada4855-3ycpz-rl C40c to +105c 16-lead lfcsp_wq cp-16-23 5,000 ADA4855-3YCP-EBZ evaluation board 1 z = rohs compliant part.
data sheet ada4855- 3 rev. a | page 19 of 20 notes
ada4855- 3 data sheet rev. a | page 20 of 20 notes ? 2008 C 2013 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d07685 - 0 - 2/13(a)

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