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2975 stender way, santa clara, california 95054 telephone: (800) 345-7015 ? ? fax: (408) 492-8674 printed in u.s.a. ? 2003 integrated device technology, inc. long haul slic IDT821611 version 1 october 8, 2003
disclamer integrated device technology, inc. reserves the right to make changes to its products or specifications at any time, without no tice, in order to improve design or performance and to supply the best possible product. id t does not assume any responsibility for us e of any circuitry described other than t he circuitry embodied in an idt product. the company makes no representations that circuitry described herein is free from pat ent infringement or other rights of third part ies which may result from its use. no license is granted by implication or otherwise under any patent, patent rights or other rights, of integrated device technology, inc. life support policy integrated device technology's products are not authorized for us e as critical components in life support devices or systems un less a specific written agreement pertaining to such intended use is executed between t he manufacturer and an officer of idt. 1. life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) supp ort or sustain life and whose failure to perform, when properly used in accordance with instru ctions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any components of a life support device or system whose failure to perform can be reasonably expecte d to cause the failure of the life support device or system, or to affect its safety or effectiveness.
? 2003 integrated device technology, inc. dsc-6236/1 the idt and the idt logo are registered tradem arks of integrated device technology, inc. 1 october 8, 2003 long haul slic features ! slic operating states: active, reverse active, ringing, standby and disconnect ! polarity reversal function ! low standby power co nsumption (35 mw) ! ? 19 v to ? 58 v battery operation ! on-hook transmission ! two-wire impedance set by single external impedance ! programmable constant-current feed ! programmable loop-detect threshold ! programmable ring-tri p detect threshold ! +3.3 v / +5 v compatible power supply ! no ? 5 v supply required ! on-chip thermal management (tmg) ! three on-chip relay drivers and relay snubbers, 1 ringing and 2 general purpose ! package available: 32 pin plcc description the IDT821611 is a long haul subscr iber line interface circuit. it implements the basic telephone line interface functions such as battery feeding, impedance matching, off-hook detection and ring-trip detection. the IDT821611 allows battery feeding between ? 19 v and ? 58 v and has the capability for driving long loops. it prov ides polarity reversal function that will save an external relay in comparison with the idt821621. the architecture of operat ing the slic in different states according to different loop states minimizes the system power dissipation. this long haul slic provides a co st-effective solution for pbx and central office applications. functional block diagram two-wire interface relay driver ring relay driver digital interface off-hook detector power feed controller ring-trip detector ryout2 ryout1 ringout d1 d2 c1 c2 c3 det vtx rsn rd rdc cas agnd vbref vcc bgnd db da b (ring) hpb hpa a (tip) tmg vbat signal transmission relay driver IDT821611
table of contents 2 october 8, 2003 features ...................................................................................................................... ................................................................................................. 1 description ................................................................................................................... ............................................................................................... 1 functional block diagram ...................................................................................................... ................................................................................... 1 pin configuration ............................................................................................................. ........................................................................................... 5 pin description ............................................................................................................... ............................................................................................ 6 functional description ........................................................................................................ ....................................................................................... 7 slic states control ........................................................................................................... .............................................................................. 7 off-hook detector ............................................................................................................. ................................................................................ 7 ring-trip detector ............................................................................................................ ................................................................................. 7 relay drivers control ......................................................................................................... .............................................................................. 8 dc feeding .................................................................................................................... .................................................................................. 8 impedance matching ............................................................................................................ ............................................................................ 9 receive gain setting .......................................................................................................... ............................................................................. 9 thermal management ............................................................................................................ .......................................................................... 9 dc electrical characteristics ................................................................................................. .................................................................................. 10 ac electrical characteristics ................................................................................................. .................................................................................. 11 test circuits ................................................................................................................. ............................................................................................. 15 basic application circuit ..................................................................................................... .................................................................................... 18 ordering information .......................................................................................................... ...................................................................................... 19 table of contents
list of figures 3 october 8, 2003 figure 1 loop-detect threshold setting .......................................................................................... .................................................................... 7 figure 2 ring-trip detection .................................................................................................... ............................................................................. 8 figure 3 relay drivers schematic................................................................................................ ........................................................................ 8 figure 4 dc feeding characteristics ............................................................................................. ...................................................................... 8 figure 5 dc feed programming circuit............................................................................................ ................................................................... 8 figure 6 two-wire ac input impedance programming network ........................................................................ ............................................... 11 figure 7 two-wire return loss ................................................................................................... ...................................................................... 15 figure 8 longitudinal balance................................................................................................... ......................................................................... 15 figure 9 four-wire longitudinal signal generation............................................................................... ............................................................ 16 figure 10 two-to-four wire gain................................................................................................. ........................................................................ 16 figure 11 four-to-two wire gain and four-to-four wire gain ...................................................................... ..................................................... 17 figure 12 loop detector switching ............................................................................................... ....................................................................... 17 figure 13 basic application circuit............................................................................................. .......................................................................... 18 list of figures
list of tables 4 october 8, 2003 table 1 pin description......................................................................................................... .............................................................................. 6 table 2 slic operating states ................................................................................................... ........................................................................ 7 table 3 absolute maximum ratings ................................................................................................ ................................................................. 10 table 4 recommended operating conditions........................................................................................ .......................................................... 10 table 5 transmission performance ................................................................................................ .................................................................. 11 table 6 longitudinal capability................................................................................................. ........................................................................ 11 table 7 idle channel noise...................................................................................................... ......................................................................... 12 table 8 insertion loss and balance return loss signal ........................................................................... ....................................................... 12 table 9 line characteristics.................................................................................................... .......................................................................... 12 table 10 power supply rejection ratio (vripple=100 mvrms), active state ......................................................... ........................................... 12 table 11 power dissipation ...................................................................................................... .......................................................................... 13 table 12 supply currents, battery = -48v ........................................................................................ .................................................................. 13 table 13 receive summing node (rsn) ............................................................................................. .............................................................. 13 table 14 logic inputs (c3-c1 and d2-d1)......................................................................................... ................................................................. 13 table 15 logic output ( det ) .............................................................................................................................. ................................................ 13 table 16 ring-trip detector input (da, db)...................................................................................... ................................................................... 13 table 17 loop detector.......................................................................................................... ............................................................................. 14 table 18 relay driver output (ringout, ryout1, ryout2).......................................................................... ............................................... 14 list of tables
pin configuration 5 october 8, 2003 IDT821611 long haul slic pin configuration IDT821611 4 3 2 1 32 31 30 29 28 27 26 25 24 23 22 21 5 6 7 8 9 10 11 12 13 ryout1 ringout vcc bgnd b (ring) a (tip) db da rd hpb hpa nc vtx vbref rsn agnd ryout2 nc tmg vbat d2 d1 nc det cas rdc 14 15 16 17 18 19 20 c3 c2 c1 nc nc nc
pin description 6 october 8, 2003 IDT821611 long haul slic pin description table 1 ? pin description pin name type plcc pin no. description agnd ground 21 analog ground. bgnd ground 1 battery ground. vbat battery 8 battery supply an d connection to substrate. vbref ? 23 battery reference pin. it should be connected to vbat. vcc power 2 +3.3 v /+5 v compatible power supply. a (tip) i/o 31 connection to the tip wire of the subscriber loop. b (ring) i/o 32 connection to the ring wire of the subscriber loop. hpa capacitor 26 a (tip) side of high-pass filter capacitor. hpb capacitor 27 b (ring) side of high-pass filter capacitor. da input 29 negative input to ring-trip comparator. db input 30 positive input to ring-trip comparator. rsn input 22 receive summing node. vtx output 24 transmit output. c1 c2 c3 inputs 16 15 14 slic state control. ttl compatible. refer to table 2 for details. d1 d2 inputs 10 9 relay driver control. ttl compatible. d1 and d2 control the relay drivers ryout1 and ryout2 respectively. logic low on d1 activates the ryout1 relay driver. logic low on d2 activates the ryout2 relay driver. ryout1 output 4 relay/switch driver. open-collector driver with emitter internally connected to bgnd. ryout2 output 5 relay/switch driver. open-collector driver with emitter internally connected to bgnd. ringout output 3 ringing relay driver. open-collector driver with emitter internally connected to bgnd. det output 13 detector output. open-collector with a built-in 15 k ? pull-up resistor. this output provides on-/off-hook status of the loop based on the selected operating state. refer to table 2 for details. the detected output will either be hook switch or ring-trip. logic low indicates that a hook switch event or ring-trip event has been detected. rd ? 28 detect resistor. an external resistor connected to this pin is used to set the loop-detect threshold. rdc ? 20 dc feed resistor. the dc feed current is programmed by a network connected between this pin and rsn. cas capacitor 17 anti-saturation capacitor. an external capacitor is connected to this pin to filter battery voltage when operating in anti-saturation region. tmg ? 7 thermal management. an external resistor is connected between this pin and vbat to offload power from slic. nc ? 6, 11, 12, 18, 19, 25 no connect.
functional description 7 october 8, 2003 IDT821611 long haul slic functional description the IDT821611 implements the basic telephone line interface functions. it provides many user pr ogrammable features including 2-wire impedance matching, loop-detect thre shold and ring-trip threshold setting, constant current feeding, 4-wi re to 2-wire gain setting, etc. the following sections describe t hese functions in detail. slic states control the IDT821611 can be operated in disconnect, ringing, active, standby or reverse active state. a combination of the control pins c3, c2 and c1 select one of the possible five operating states. see table 2 for details. the IDT821611 provides an off-hook detector and a ring-trip detector on chip to support the necessary signaling functions. the selection of the detectors is based on the slic operating state. the output of the detectors is reported by the det pin. once a hook switch event or ring-trip event occurs, the det pin goes low. ! disconnect when the slic is in disconnect state, both the tip and ring outputs are in high impedance condition. in this state, the off-hook detector is inoperative and the power di ssipation reduces to the lowest. the disconnect state is useful for out-of-service lines. ! ringing when the slic is in ringing state, the ring relay driver (ringout) is activated and the tip and ring outputs are in high impedance condition. the ringing source is c onnected by an external ring relay to the line. in ringing state, the status of the ring-trip detector is reported by the det pin. ! active in active state, the slic is fully functional. the standard battery convention applies. all signal transmission and loop supervision functions are active. the status of the off-hook detector is gated to the det pin. ! standby in standby state, most of the internal circuitry is powered down, resulting in low power dissipati on. the off-hook detection function operates normally, but signal transmi ssion is not enabled. this state allows for monitoring off-hook trans itions while maintaining lowest possible power consumption. ! reverse active the reverse active state provides the same functionality as the active state, except that the normal battery feed convention is reversed. during reverse active state, the status of the off-hook detector is reported by the det pin. off-hook detector the off-hook detector monitors the hook switch of the loop during active, reverse active or standby state. the output of the det pin goes low when an off-hook event is detected. the loop-detect threshold is program med by an external resistor r d, which is connected between the rd and agnd pins.see figure 1 for details. figure 1 loop-detect threshold setting the loop current threshold i on and i off are calculated by the following equations: the r-c network, formed by the capacitor c d and the resistor r d, determines the on-hook to off-hook time constant. the value of c d for a typical on-hook to off-hook time cons tant of 0.5 ms is calculated by: ring-trip detector figure 2 shows a general ringing circui t for the IDT821611. during ringing state, the on-chip ring relay driver (ringout) is activated and the ringing source is connected by the ring relay to the tip and ring lines through the resistors r 1 and r 2 . the ring-trip detector monitors the loop status and reports it via the det pin. when the loop goes off- hook, the bridging resistors r b1 , r b2 , r 3 and r 4 , and the filter capacitors c rt1 and c rt2 cause the voltage on db to go positive with respect to da and the det pin goes low. table 2 ? slic operating states state control pins two-wire status det output c3 c2 c1 0 1 0 0 disconnect ring-trip detector 1 1 0 1 ringing ring-trip detector 2 1 1 0 active off-hook detector 3 1 1 1 standby off-hook detector 4010 reverse active off-hook detector 5 0 0 0 0 0 1 0 1 1 reserved ring-trip detector digital interface a(tip) b(ring) rd det r d c d two-wire interface c1 c2 agnd off-hook detector slic c3 i on 510 r d --------- - = i off 415 r d --------- - = c d 0.5ms r d ----------------- =
functional description 8 october 8, 2003 IDT821611 long haul slic if r lmax is the maximum line resistance to be detected as an off- hook, the bridging resistors should be chosen as that: where: r feed = r 1 + r 2 if the line resistance is less than r lmax , it means that an off-hook event occurs, otherwise, the loop is in on-hook state. figure 2 ring-trip detection relay drivers control the IDT821611 provides an on-chip ring relay driver (ringout) to control the external ring relay. this ring relay driver is active only in ringing state. it is an internal trans istor with the emitter internally connected to bgnd and the collector as the driver output (see figure 3 ). during ringing, the ring relay driver is activated and the ringing source is connected by an external ring relay to the tip and ring lines through ring feed resistors. the IDT821611 also provides two additional relay drivers (ryout1 and ryout2) on the chip. they are open- collector drivers with emitters internally connected to bgnd. the tw o drivers allow for direct operation of external test relays. the digital pi ns d1 and d2 are used to control the relay drivers ryout1 and ryout2 respectively. logic low on d1 and d2 activates their respective relay drivers. figure 3 relay drivers schematic dc feeding the IDT821611 provides constant -current feeding as shown in figure 4 . figure 4 dc feeding characteristics notes: 1. 2. 3. the feed current is programmable. two resistors r dc1 and r dc2 , and a capacitor c dc form the network for programming the feed current. see figure 5. figure 5 dc feed programming circuit the feed current i feed is calculated by the following equation: the polarity reversal time is controlled by c dc and its parallel combination of r dc1 and r dc2. a typical polarity tran sition time is 1.5 ms. the value of c dc can then be calculated by the following equation: r b1 r 3 ---------- r b2 r 4 ---------- r lmax r feed + () r lmax ------------------------------------------------- - == a(tip) b(ring) ringing source + - tip line ring line r f r f k r k r r 4 r 3 r b2 r b1 r 1 r 2 c rt1 c rt2 db da k r ring relay ringout slic ringout ryout1 ryout2 bgnd bgnd 60 note 3 note 2 note 1 0 i l (ma) 30 vab (volts) v ab i l r l 1250 r dc1 r dc2 + ------------------------------------ r l where , = = r l r l 2r f + = v ab 0.857 v bat 3.3 + () i l r dc1 r dc2 + 300 ------------------------------------ ? = v ab 0.857 v bat 1.2 + () i l r dc1 r dc2 + 300 ------------------------------------ ? = slic a(tip) b(ring) rdc rsn r dc2 r dc1 c dc r l i l a b feed current is programmed by r dc1 and r dc2. i feed 1250 r dc1 r dc2 + ------------------------------------ =
functional description 9 october 8, 2003 IDT821611 long haul slic the values of r dc1 and r dc2 should be kept approximately equal in order to minimize the size of c dc . an external capacitor c cas connected to the cas pin is used to filter noise that may originate from the battery source and prevent the output amplifiers from saturating. the val ue of this anti-saturation capacitor is calculated by the equation below: where, f c is the desired filter cut-off frequency. impedance matching the two-wire ac input impedance r 2win is programmed by means of an external impedance (r t ) connected between the rsn and vtx pins (see figure 13 ). r t is calculated by the following equation: where, r f is the value of the fuse resistor. note that when computing r t, the internal current amplifier pol e and any external stray capacitance between the rsn and vtx pins must be taken into account. receive gain setting the 4-wire to 2-wire gain (g 42l ) is defined as the receive gain. it is calculated by the following equation: where, r l is the terminating impedance; r rx is connected between vrx and rsn; r t is defined above; r f is the fuse resistor. see figure 11 for details. thermal management the IDT821611 uses a power m anagement technique of offloading the thermal energy from the slic to an external resistor r tmg. r tmg is connected between the tmg and vbat pins as shown in figure 13 . this resistor shares some of t he loop current and limits the on-chip power dissipation in active state. the selection of r tmg normally needs to satisfy the following condition: with the programmed loop curr ent being fed into a short circuit loop from the nominal battery, all of the loop current is supplied by r tmg. so, r tmg can be calculated by the equation below: the power dissipated in the resistor r tmg during active state is: the power dissipated in the sl ic during active state is: c dc 1.5ms r dc1 r dc2 + r dc1 r dc2 ? ----------------------------- - ? = c cas 1 1.7 10 5 f c ? ---------------------------- = r t 250 r 2win 2r f ? () = g 42l r l r rx ----------- 500r t r t 250 r l 2r f + () + -------------------------------------------------------- ? = r tmg v bat 8v ? i loop -------------------------- - 70 ? ? ?? ?? p rtmg v bat 8v ? i l r l ? () ? () 2 r tmg 70 ? + () 2 ------------------------------------------------------------ r tmg ? = p slic v bat i l ? p rtmg ? r l i l () 2 ? 0.12w + =
dc electrical characteristics 10 october 8, 2003 IDT821611 long haul slic dc electrical characteristics note: stresses greater than those listed under absolu te maximum ratings may cause permanent da mage to the device. this is a stress r ating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. table 3 ? absolute maximum ratings rating com?l & ind?l unit power supply voltage vcc -0.4 to +7 v battery voltage vbat 0.4 to -70 v voltage on any pin with respect to ground (low voltage portion) -0.4 to vcc+0.4 v voltage on any pin with respect to gr ound (high voltage portion) +1 to vbat v package power dissipation 1.7 w storage temperature -65 to +150 c esd (human body model) 500 v table 4 ? recommended operating conditions parameters min. max. unit ambient temperature -40 +85 c power supply voltage vcc +3.3 v nominal +5 v nominal 3.15 4.75 3.45 5.25 v v battery voltage vbat -58 -19 v
ac electrical characteristics 11 october 8, 2003 IDT821611 long haul slic ac electrical characteristics unless otherwise stated, test conditions are vbat = -52 v, vcc = +5 v, r l = 600 ? , r dc1 = r dc2 = 27.17 k ? , r tmg = 2350 ? , r d = 35.4 k ? , no fuse resistors, c hp = 0.22 f, c dc = 0.1 f, c cas = 0.33 f, d1 = 1n400x, 2-wire ac input impedance is a 600 ? resistance synthesized by the programming network as shown below. figure 6 two-wire ac input impedance programming network table 5 ? transmission performance description test conditions (see figure 7 ) min. typ. max. unit note 2-wire return loss 200 hz to 3.4 khz 26 db analog output vtx impedance 3 20 ? analog output vtx offset voltage -50 +50 mv overload level, 2-wire and 4-wire active state 2.5 vpk overload level on-hook, r lac = 600 ? 0.77 vrms thd, total harmonic distortion 0 dbm -64 -50 db +7 dbm -55 -40 thd, on-hook 0 dbm, r lac = 600 ? -36 table 6 ? longitudinal capability description test conditions (see figure 8 , figure 9 ) min. typ. max. unit note longitudinal to metallic l-t, l-4 balance 200 hz to 1 khz 0 to 70 c -40 to +85 c 63 58 db 1 khz to 3.4 khz 0 to 70 c -40 to +85 c 58 53 longitudinal signal generation 4-l 200 hz to 3.4 khz 40 longitudinal current per pin active state 20 27 35 marms longitudinal impedance at a or b 0 to 100 h z 25 ? /pin vtx rsn r t1 = 75 k ? r t2 = 75 k ? c t1 = 120 pf r rx = 150 k ? v rx
ac electrical characteristics 12 october 8, 2003 IDT821611 long haul slic table 7 ? idle channel noise description test conditions min. typ. max. unit note c-message weighted noise r l = 600 ? 0 to 70c r l = 600 ? -40 to +85c 7+10 +12 dbrnc psophometric weighted noise r l = 600 ? 0 to 70c r l = 600 ? -40 to +85c -83 -80 -78 dbmp table 8 ? insertion loss and balance return loss signal description test conditions (see figure 10 , figure 11 ) min. typ. max. unit note gain accuracy, 4- to 2-wire 0 dbm, 1 khz -0.20 +0.20 db gain accuracy, 2- to 4-wire, 4- to 4-wire 0 dbm, 1 khz -6.22 -6.02 -5.82 gain accuracy, 4- to 2-wire on-hook -0.35 +0.35 gain accuracy, 2- to 4-wire, 4- to 4-wire on-hook -6.37 -6.02 -5.67 gain accuracy over frequency 300 to 3.4 khz, relative to 1 khz -0.15 +0.15 gain tracking +3 dbm to -55 dbm, relative to 0 dbm -0.15 +0.15 gain tracking, on-hook 0 dbm to -37 dbm +3 dbm to 0 dbm -0.15 -0.35 +0.15 +0.35 group delay 0 dbm, 1 khz 4 s table 9 ? line characteristics description test conditions min. typ. max. unit note i l , short loops, active state r ldc = 600 ? 20 23 26 ma i l , long loops, active state r ldc = 1930 ? , vbat = -42.75 v, t a = 25 c 18 19 i l , accuracy, standby state t a = 25 c 0.7i l i l 1.3i l constant-current region 18 30 i l , loop current, disconnect state r l = 0 100 a i l lim active, a and b to ground 65 ma vab, open circuit voltage v bat = -52 v -42.75 -44 v table 10 ? power supply rejection ratio (v ripple =100 mvrms), active state description test conditions min. typ. max. unit note vcc 50 hz to 3.4 khz 30 40 db vbat 50 hz to 3.4 khz 28 50 effective internal resi stance cas pin to vbat 335 k ? i l vbat 3v ? r l 200 + ----------------------------------- =
ac electrical characteristics 13 october 8, 2003 IDT821611 long haul slic table 11 ? power dissipation description test conditions min. typ. max. unit note on-hook, disconnect state 18 70 mw on-hook, standby state 32 100 on-hook, active/reverse active state 210 270 off-hook, standby state r l = 600 ? 930 1200 off-hook, active/reverse active state r l = 300 ? , r tmg = 2350 ? 760 900 table 12 ? supply currents, battery = -48v description test conditions min. typ. max. unit note i cc , on-hook vcc supply current disconnect state standby state active state 2.6 1.9 4.3 4.0 4.0 8.5 ma i bat , on-hook vbat supply current disconnect state standby state active state 0.25 0.55 3.8 1.0 1.5 4.8 table 13 ? receive summing node (rsn) description test conditions min. typ. max. unit note rsn dc voltage i rsn = 0 ma 0 v rsn impedance 200 hz to 3.4 khz 10 20 ? table 14 ? logic inputs (c3-c1 and d2-d1) description test conditions min. typ. max. unit note v ih , input high voltage 2.0 v v il , input low voltage 0.8 i ih , input high current -75 40 a i il , input low current -400 table 15 ? logic output ( det ) description test conditions min. typ. max. unit note v ol , output low voltage i out = 0.3 ma, 15 k ? to vcc 0.4 v v oh , output high voltage i out = -0.1 ma, 15 k ? to vcc 2.4 table 16 ? ring-trip detector input (da, db) description test conditions min. typ. max. unit note bias current -500 -50 na offset voltage source resistance = 2 m ? -100 0 +100 mv
ac electrical characteristics 14 october 8, 2003 IDT821611 long haul slic table 17 ? loop detector description test conditions (see figure 12 ) min. typ. max. unit note on threshold r d = 35.4 k ? 11.5 17.3 ma off threshold r d = 35.4 k ? 9.4 14.1 hysteresis r d = 35.4 k ? 04.4 table 18 ? relay driver output (ringout, ryout1, ryout2) description test conditions min. typ. max. unit note on voltage i ol = 40 ma +0.3 +0.7 v off leakage v oh = +5 v 100 a zener breakover i z = 100 a9.4 v zener on voltage i z = 30 ma 10
test circuits 15 october 8, 2003 IDT821611 long haul slic test circuits figure 7 two-wire return loss figure 8 longitudinal balance slic a (tip) vtx agnd rsn b (ring) v m r r z d v s r t1 r t2 c t1 r rx return loss = -20 log (2 v m / v s ) z d : the desired impedance (e.g., the characteristic impedance of the line) slic a (tip) vtx agnd rsn b (ring) v l r t longitudinal to two-wire balance = 20 log (v ab / v l ) r l 2 r l 2 v ab c longitudinal to four-wire balance = 20 log (vtx / v l ) 1 2 fc << r l
test circuits 16 october 8, 2003 IDT821611 long haul slic figure 9 four-wire longitudinal signal generation figure 10 two-to-four wire gain slic a (tip) vtx agnd rsn b (ring) v rx r t 4-l long. sig. gen. = 20 log (v l / v rx ) r l 2 r l 2 v l r rx slic a (tip) vtx agnd rsn b (ring) r t gain 2-4 = 20 log (vtx / v ab ) r l 2 r l 2 v l r rx v ab
test circuits 17 october 8, 2003 IDT821611 long haul slic figure 11 four-to-two wire gain and four-to-four wire gain figure 12 loop detector switching slic a (tip) vtx agnd rsn b (ring) r t gain 4-2 = 20 log (v ab / v rx ) r l r rx v rx v ab gain 4-4 = 20 log (vtx / v rx ) slic a (tip) det b (ring) 15 pf r l vcc 6.2 k ?
basic application circuit 18 october 8, 2003 IDT821611 long haul slic basic application circuit figure 13 basic application circuit a (tip) rd vtx rsn r t da db hpa hpb b (ring) ryout1 ryout2 bgnd vbref vbat tmg bat cas c cas det c1 c2 c3 d1 d2 agnd rdc r dc2 r dc1 c dc +5 v r tmg d 1 2.2 nf 2.2 nf c hp c d r d v rx r rx v tx vcc IDT821611 ringing source + - tip line ring line r f r f k r k r r 4 r 3 r b2 r b1 r 1 r 2 c rt 1 c rt 2 k r ring relay ringout
IDT821611 long haul slic corporate headquarters 2975 stender way santa clara, ca 95054 for sales: 800-345-7015 or 408-727-5116 fax: 408-492-8674 www.idt.com for tech support: 408-330-1753 email:telecomhelp@idt.com the idt logo is a registered trademark of integrated device technology, inc. ordering information 19 october 8, 2003 ordering information data sheet document history 10/08/2003 pgs. 1, 10, 12, 13 idt xxxxxx x x dev ice ty pe blank process/ temperature range j 821611 industrial (-40 c to +85 c) plastic leaded chip carrier (plcc, pl32) long haul slic package

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