View AM79R241JC_3049232.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

publication# 080249 rev: i amendment: / 0 issue date: august 2000 intelligent access ? voice solutions am79r241 intelligent subscriber line interface circuit (islic ? ) distinctive characteristics monitor of two-wire interface voltages and currents supports ? voice transmission ? through chip ring generation ? programmable dc feed characteristics ? independent of battery ? current limited ? selectable off-hook and ground-key thresholds ? subscriber line diagnostics ? leakage resistance ? loop resistance ? line capacitance ? bell capacitance ? foreign voltage sensing ? power cross and fault detection supports internal short loop and external ringing +5 v and battery supplies dual battery operation for system power saving ? automatic battery switching ? intelligent thermal management compatible with inexpensive protection networks ? accommodates low tolerance fuse resistors or ptc thermistors metering capable ? 12 khz and 16 khz ? smooth polarity reversal tip-open state supports ground start signaling integrated test load switches/relay drivers block diagram two-wire interface bgnd vcc gnd signal transmission g ain/level s hift longitudinal control attenuator thermal management control fault meas signal conditioning switch driver relay drivers relay driver 1 input decoder and control registers relay control ad sa bd sb hpb hpa tmn tmp vbl vbh r2 r3 rye r1 tms imt ilg vref vsab vlb vtx rsn cref ld p3 p2 p1
2 am79r241 datasheet table of contents distinctive characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 distinctive characteristics of the intelligent access? voice chipset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ordering information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 connection diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 intelligent access? voice chipsets linecard with am79r241 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 linecard parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 thermal resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 operating ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 target specifications (see note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 relay driver specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 am79r241 transmission specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 am79r241 ringing specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 am79r241 current-limit behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 am79r241 fault indications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 timing specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 physical dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 revision summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
am79r241 datasheet 3 the am79r241, in combination with an islac ? device, implements the telephone line interface function. this enables the design of a low cost, high performance, fully software programmable line interface for multiple country applications worldwide. all ac, dc, and signaling parameters are fully programmable via microprocessor or gci interfaces on the islac device. additionally, the am79r241 device has integrated self-test and line-test capabilities to resolve faults to the line or line circuit. the integrated test capability is crucial for remote applications where dedicated test hardware is not cost effective. distinctive characteristics of the intelligent access ? voice chipset performs all battery feed, ringing, signaling, hybrid and test (borscht) functions two chip solution supports high density, multi- channel architecture single hardware design meets multiple country requirements through software programming of: ? ringing waveform and frequency ? dc loop-feed characteristics and current-limit ? loop-supervision detection thresholds ? off-hook debounce circuit ? ground-key and ring-trip filters ? off-hook detect de-bounce interval ? two-wire ac impedance ? transhybrid balance ? transmit and receive gains ? equalization ? digital i/o pins ? a-law/-law and linear selection supports internal and external battery-backed ringing ? self-contained ringing generation and control ? supports external ringing generator and ring relay ? ring relay operation synchronized to zero crossings of ringing voltage and current ? integrated ring-trip filter and software enabled manual or automatic ring-trip mode supports metering generation with envelope shaping smooth or abrupt polarity reversal adaptive transhybrid balance ? continuous or adapt and freeze supports both loop-start and ground-start signaling exceeds lssgr and ccitt central office requirements selectable pcm or gci interface ? supports most available master clock frequencies from 512 khz to 8.192 mhz on-hook transmission power/service denial mode line-feed characteristics independent of battery voltage only 5 v, 3.3 v and battery supplies needed low idle-power per line linear power-feed with intelligent power- management feature compatible with inexpensive protection networks; accommodates low-tolerance fuse resistors while maintaining longitudinal balance monitors two-wire interface voltages and currents for subscriber line diagnostics built-in voice-path test modes power-cross, fault, and foreign voltage detection integrated line-test features ? leakage ? line and ringer capacitance ? loop resistance integrated self-test features ? echo gain, distortion, and noise 0 to 70c commercial operation ? ?40c to 85c extended temperature range available small physical size up to three relay drivers per islic ? device ? configurable as test load switches
4 am79r241 datasheet block diagrams figure 1. example four-channel linecard block diagram rc networks and protection a1 b1 b3 a3 b2 a2 a4 b4 vcca quad islac am79q2243 am79r241 am79r241 am79r241 am79r241 ld1 vref 7 7 ld2 ld3 7 ld4 3 p1-p3 7 agnd1 agnd2 rref vccd dxa/du drb dra/dd io1-io4 dgnd2 dgnd1 dxb dclk/s0 pclk/fs mclk fs/dcl dio/s1 int tsca/g tscb cs/rst batl bath 4 4 rshb rslb
am79r241 datasheet 5 figure 2. am79r241 block diagram oht fixed longitudinal voltage ad bd sa sb rsn vlb imt ilg + - + - = 0.01 + - + - + - + vtx hpa hpb vbh vref ia sense ib sense vref vbl ld vcc gnd active low battery vref tmn thermal management control bgnd vsab decoder standby internal ringing tmp vref ib 600 ib demux rd2 rd3 c1 c2 c3 rd1 control register p1 p2 p3 reserved gain/level shift ia 600 tms active high battery high neg batt sel r1 r3 rye r2 power amplifiers positive supply bgnd to power amplifiers tip open cref thermal shutdown disconnect fault meas. fault meas. ia ia 600 ib 600 + ia ib 600 600 ? b amplifier a amplifier
6 am79r241 datasheet ordering information legerity standard products are available in several packages and operating ranges. the ordering number (valid combination) is formed by a combination of the elements below. an islac device must be used with this part. j valid combinations valid combinations list configurations planned to be supported in volume for this device. consult the local legerity sales office to confirm availability of specific valid combinations, and to check on newly released valid combinations. device name/description am79r241 intelligent subscriber line interface circuit temperature range c= commercial (0 c to +70 c)* package type j = 32-pin plastic leaded chip carrier (pl032) am79r241 c valid combinations am79r241 jc note: *functionality of the device from 0c to 70c is guaranteed by production testing. performance from ?40c to +85c is guaranteed by characterization and periodic sampling of production units.
am79r241 datasheet 7 connection diagram 6 7 8 9 10 11 12 13 29 28 27 26 25 24 23 22 14 15 16 17 18 19 20 4 3 2 1 32 31 30 r1 vbh bd vcc ad rsvd p2 ld vsab vlb gnd rsn vref sa imt ilg hpa hpb cref sb r2 r3 tmp tms p1 rye tmn p3 vbl 5 bgnd vtx 21 rsvd am79r241 32-pin plcc
8 am79r241 datasheet pin descriptions pin pin name i/o description ad, bd a, b line drivers o provide the currents to the a and b leads of the subscriber loop. bgnd ground ground return for high and low battery supplies. cref +3.3 vdc vccd reference. it is the digital high logic supply rail, used by the islic to islac interface. gnd ground analog and digital ground return for vcc. hpa, hpb high-pass filter capacitor o these pins connect to chp, the external high-pass filter capacitor that separates the dc loop-voltage from the voice transmission path. ilg longitudinal current sense o ilg is proportional to the common-mode line current (iad ? ibd), except in disconnect mode, where ilg is proportional to the current into grounded sb. imt metallic current sense o imt is proportional to the differential line current (iad + ibd), except in disconnect mode, where imt is proportional to the current into grounded sa. the am79r241 indicates thermal overload by pulling imt to cref. ld register load i the ld pin controls the input latch and responds to a 3-level input. when the ld pin is a logic 1 ( >(vref+0.3v) ), the logic levels on p1 ? p3 latch into the am79r241 control register bits that operate the mode-decoder. when the ld pin is a logic 0 ( <(vref-0.3v) ), the logic levels on p1 ? p3 latch into the am79r241 control register bits that control the relay drivers (rd1 ? rd3). when the ld pin level is at ~vref, the control register contents are locked. p1 ? p3 control bus i inputs to the latch for the operating-mode decoder and the relay-drivers. r1 relay 1 driver o collector connection for relay 1 driver. emitter internally connected to bgnd. r2 relay 2 driver o collector connection for relay 2 driver. emitter internally connected to rye r3 relay 3 driver o collector connection for relay 3 driver. emitter internally connected to rye. rsn receive summing node i the metallic current between ad and bd is equal to 500 times the current into this pin. networks that program receive gain and two-wire impedance connect to this node. this input is at a virtual potential of vref. rsvd reserved this is used during legerity testing. in the application, this pin must be left floating. rye relay 2, 3 common emitter o emitter connection for r2 and r3. normally connected to relay ground. sa, sb a, b lead voltage sense i sense the voltages on the line side of the fuse resistors at the a and b leads. external sense resistors, rsa and rsb, protect these pins from lightning or power-cross. tmp, tmn, tms thermal management external resistors connected from tmp to tms and tmn to vbl to offload excess power from the am79r241. vbh battery (power) connection to high-battery supply used for ringing and long loops. connects to the substrate. when only a single battery is available, it connects to both vbh and vbl. vbl battery (power) connection to low-battery supply used for short loops. when only a single battery is available, this pin can be connected to vbh. vcc +5 v power supply positive supply for low voltage analog and digital circuits in the am79r241. vlb longitudinal voltage i sets the dc longitudinal voltage of the am79r241. it is the reference for the longitudinal control loop. when the vlb pin is greater than vref, the am79r241 sets the longitudinal voltage to a voltage approximately half-way between the positive and negative power supply battery rails. when the vlb pin is driven to levels between 0v and vref, the longitudinal voltage decreases linearly with the voltage on the vlb pin. vref 1.4 v analog reference i the islac chip provides this voltage which is used by the am79r241 for internal reference purposes. all analog input and output signals interfacing to the islac chip are referenced to this pin. vsab loop voltage o scaled-down version of the voltage between the sense points sa and sb on this pin. vtx 4-wire transmit signal o the voltage between this pin and vref is a scaled down version of the ac component of the voltage sensed between the sa and sb pins. one end of the two-wire input impedance programming network connects to vtx. the voltage at vtx swings positive and negative with respect to vref.
am79r241 datasheet 9 general description the intelligent access voice chipsets integrate all functions of the subscriber line. two chip types are used to implement the linecard; an am79r241 device and an islac device. these provide the following basic functions: 1. the am79r241: a high voltage, bipolar device that drives the subscriber line, maintains longitudinal balance and senses line conditions. 2. the islac device: a low voltage cmos ic that provides conversion, control and dsp functions for the am79r241. complete schematics of linecards using the intelligent access voice chipsets for internal and external ringing are shown in figure 3 and figure 4. the am79r241 uses reliable, bipolar technology to provide the power necessary to drive a wide variety of subscriber lines. it can be programmed by the islac device to operate in eight different modes that control power consumption and signaling. this enables it to have full control over the subscriber loop. the am79r241 is designed to be used exclusively with the islac devices. the am79r241 requires only +5 v power and the battery supplies for its operation. the am79r241 implements a linear loop-current feeding method with the enhancement of intelligent thermal management. this limits the amount of power dissipated on the am79r241 chip by dissipating power in external resistors in a controlled manner. each islac device contains high-performance circuits that provide a/d and d/a conversion for the voice (codec), dc-feed and supervision signals. the islac device contains a dsp core that handles signaling, dc-feed, supervision and line diagnostics for all channels. the dsp core selectively interfaces with three types of backplanes: standard pcm/mpi standard gci modified gci with a single analog line per gci channel the intelligent access voice chipset provides a complete software configurable solution to the borscht functions as well as complete programmable control over subscriber line dc-feed characteristics, such as current limit and feed resistance. in addition, these chipsets provide system level solutions for the loop supervisory functions and metering. in total, they provide a programmable solution that can satisfy worldwide linecard requirements by software configuration. software programmed filter coefficients, dc-feed data and supervision data are easily calculated with the winslac software. this pc software is provided free of charge. it allows the designer to enter a description of system requirements. winslac then computes the necessary coefficients and plots the predicted system results. the am79r241 interface unit inside the islac device processes information regarding the line voltages, loop currents and battery voltage levels. these inputs allow the islac device to place several key am79r241 performance parameters under software control. the main functions that can be observed and/or controlled through the islac backplane interface are: dc-feed characteristics ground-key detection off-hook detection metering signal longitudinal operating point subscriber line voltage and currents ring-trip detection abrupt and smooth battery reversal
10 am79r241 datasheet subscriber line matching ringing generation sophisticated line and circuit tests to accomplish these functions, the islic device collects the following information and feeds it, in analog form, to the islac device: the metallic (imt) and longitudinal (ilg) loop currents the ac (vtx) and dc ( vsab) loop voltage the outputs supplied by the islac device to the islic device are then: a voltage (vhli) that provides control for the following high-level islic device outputs: ? dc loop current ? internal ringing signal ? 12 or 16 khz metering signal a low-level voltage proportional to the voice signal (vouti) a voltage that controls longitudinal offset for test purposes (vlbi) the islac device performs the codec and filter functions associated with the four-wire section of the subscriber line circuitry in a digital switch. these functions involve converting an analog voice signal into digital pcm samples and converting digital pcm samples back into an analog signal. during conversion, digital filters are used to band-limit the voice signals. the user-programmable filters set the receive and transmit gain, perform the transhybrid balancing function, permit adjustment of the two-wire termination impedance and provide frequency attenuation adjustment (equalization) of the receive and transmit paths. adaptive transhybrid balancing is also included. all programmable digital filter coefficients can be calculated using winslac software. the pcm codes can be either 16-bit linear two ? s-complement or 8-bit companded a-law or -law. besides the codec functions, the intelligent access voice chipset provides all the sensing, feedback, and clocking necessary to completely control islic device functions with programmable parameters. system-level parameters under programmable control include active loop current limits, feed resistance, and feed mode voltages. the islac device supplies complete mode control to the islic device using the control bus (p1-p3) and tri-level load signal (ldi). the intelligent access voice chipset provides extensive loop supervision capability including off- hook, ring-trip and ground-key detection. detection thresholds for these functions are programmable. a programmable debounce timer is available that eliminates false detection due to contact bounce. for subscriber line diagnostics, ac and dc line conditions can be monitored using built-in test tools. measured parameters can be compared to programmed threshold levels to set a pass/fail bit. the user can choose to send the actual measurement data directly to a higher level processor by way of the pcm voice channel. both longitudinal and metallic resistance and capacitance can be measured, which allows leakage resistance, line capacitance, and telephones to be identified.
am79r241 datasheet 11 intelligent access ? voice chipsets linecard with am79r241 figure 3. internal ringing linecard schematic rfai rfbi rsai rsbi a b u3 dhi bath batl u1 am79r241 p1 p2 p3 ld sa sb ad bd vbh vbl tmp tmn rsn vlb imt ilg vtx vref vsab gnd +5 v vcc cbatli cbathi * css required for > 2.2 vrms metering ** connections shown for one channel *** dt2i diode is optional - should be connected if there is a chance that this chip may be replaced by the am79r251 device. otherwise, it creates a short. dli rmgli rmgpi tms bgnd r2 rye r3 r1 bath hpa hpb chpi cssi rrxi rmti vref rlgi vref u2 islac vref vilgi vimti vlbi vsabi vini vouti back plane ldi p1 p2 p3 dgnd vcca vccd shb slb bath batl iref agnd vcc +3.3vdc rshb rslb rref cref 3.3 v cadi cbdi rsvd rsvd rti d1 d2 u4 cs dt2i *** spb rhlai vhli rhlbi rhlci rhldi vref chldi chlbi rtest dt1i
12 am79r241 datasheet figure 4. external ringing linecard schematic rfai rfbi rsai rsbi rrxi a b dhi bath batl u1 am79231 p1 p2 p3 ld rsn vlb imt ilg vtx vref vsab gnd +5 v vcc cbatli cbathi * css required for > 2.2 vrms metering ** connections shown for one channel *** dt2i is optional - s hould be present if there is a chance that this chip may be replaced by the am79r251 device. otherwise, it creates a short. dli rmgli rmgpi rmti vref rlgi vref rhlai bath cs 45 8 1 2 u5 6 7 rsrbi rsrc rgfdli ring bus kri kri(a) cadi cbdi chpi cssi u2 islac vref vilgi vimti vlbi vsabi vini vhli vouti back plane ldi p1 p2 p3 dgnd agnd vcca vccd rshb rslb shb slb bath batl rref iref xsbi xsc vcc +3.3 vdc +5 v kri spb rsvd cref 3.3 v rti (b) dt2i *** rhlbi rhlci rhldi vref chldi chlbi sa sb ad bd vbh vbl tmp tmn tms bgnd r2h rye r3h r1 hpa hpb rsvd2 rtest dt1i
am79r241 datasheet 13 linecard parts list the following list defines the parts and part values required to meet target specification limits for channel i of the linecard (i = 1, 2, 3, 4).. notes: 1. value can be adjusted to suit application. 2. can be looser for relaxed ring-trip requirements. 3. required for metering > 2.2 vrms, otherwise may be omitted. 4. dt2i is optional - should be put if there is a chance that this chip may be replaced by am79r251. item type value tol. rating comments u1 am79r241 islic device u2 am79x22xx islac device u3, u4 b1100cc 100 v teccor battrax protector u5 tisp61089a transient voltage suppresser, power innovations d1, d2 diode 1 a 100 v dhi, dli, dt1i, dt2i 4 diode 100 ma 100 v 50 ns rfai, rfbi resistor 50 ? 2% 2 w fusible ptc protection resistors rsai, rsbi resistor 200 k ? 2% 1/4 w sense resistors rti resistor 80.6 k ? 1% 1/10 w rrxi resistor 100 k ? 1% 1/10 w rref resistor 69.8 k ? 1% 1/10 w current reference rmgli, rmgpi resistor 1 k ? 5% 1 w thermal management resistors rshb, rslb resistor 750 k ? 1% 1/8 w rhlai resistor 40.2 k ? 1% 1/10 w rhlbi resistor 4.32 k ? 1% 1/10 w rhlci resistor 2.87 k ? 1% 1/10 w rhldi resistor 2.87 k ? 1% 1/10 w chlbi capacitor 3.3 nf 10 % 10 v not polarized chldi capacitor 0.82 f 10 % 10 v ceramic rmti resistor 3.01 k ? 1% 1/8 w rlgi resistor 6.04 k ? 1% 1/8 w rtest resistor 2 k ? 1% 1 w test board cadi, cbdi 1 capacitor 22 nf 10% 100 v ceramic, not voltage sensitive cbathi, cbatli capacitor 100 nf 20% 100 v ceramic chpi capacitor 22 nf 20% 100 v ceramic csi 1 capacitor 100 nf 20% 100 v protector speed up capacitor cssi 3 capacitor 56 pf 5% 100 v ceramic components for external ringing rgfdi resistor 510 ? 2% 2 w 1.2 w typ rsrbi, rsrc resistor 750 k ? 2% 1/4 w matched to within 0.2% for initial tolerance and 0 to 70 c ambient temperature range. 2 17 mw typ kri relay 5 v coil dpdt
14 am79r241 datasheet electrical characteristics power dissipation loop resistance = 0 to unless otherwise noted (not including fuse resistors), 2 x 50 ? fuse resistors, batl = ? 36 v, bath = ? 90 v, vcc = +5 v. for power dissipation measurements, dc-feed conditions are as follows: ila (active mode current limit) = 25 ma (irsn = 50 a) rfd (feed resistance) = 500 ? vas (anti-sat activate voltage) = 10 v vapp (apparent battery voltage) = 48 v rmgl = rmgp (thermal management resistors) = 1 k ? description test conditions min typ max unit power dissipation normal polarity on-hook disconnect 55 70 mw on-hook standby 80 100 on-hook transmission islic fixed longitudinal voltage 175 215 on-hook active high battery islic 340 400 off-hook active low battery islic rl = 294 ? tmg 700 200 800 power supply currents on-hook disconnect vbh vbl vcc 0.4 0.1 3.0 0.7 3.5 ma on-hook standby vbh vbl vcc 0.75 0 3.1 1.1 3.5 on-hook transmission vbh fixed longitudinal voltage vbl vcc 1.85 0 5 2.5 6 on-hook active high battery vbh vbl vcc 3.6 0 7.3 4.5 8.0 off-hook active low battery vbh rl = 294 ? vbl vcc 0.9 26.9 7.5 2.0 10
am79r241 datasheet 15 thermal resistance the junction to air thermal resistance of the am79r241 in a 32-pin, plcc package is 45 c/w. the typical junction to case thermal resistance is 14 c/w. measured under free air convection conditions and without external heatsinking. absolute maximum ratings operating ranges operating ranges define those limits between which device functionality is guaranteed. functionality of the device from 0 c to 70 c is guaranteed by production testing. performance from ? 40 c to 85 c is guaranteed by characterization and periodic sampling of production units. environmental ranges electrical maximum ranges note: vloopmax: maximum expected loop voltage in application; i loop ? off-hook loop resistance. vpk: peak signal voltage for application. storage temperature ? 55 to +150 c ambient temperature, under bias ? 40 to +85 c vcc with respect to gnd ? 0.4 to +7 v vbh, vbl with respect to gnd 2 +0.4 to ? 104 v bgnd with respect to gnd ? 3 to +3 v voltage on relay outputs +7 v ad or bd to bgnd: continuous vbh ? 1 to bgnd + 1 10 ms (f = 0.1 hz) vbh ? 5 to bgnd + 5 1 s (f = 0.1 hz) vbh ? 10 to bgnd + 10 250 ns (f = 0.1 hz) vbh ? 15 to bgnd + 15 current into sa or sb: 10 s rise to ipeak; 1000 s fall to 0.5 ipeak; 2000 s fall to i =0 ipeak = 5 ma current into sa or sb: 2 s rise to ipeak; 10 s fall to 0.5 ipeak; 20 s fall to i = 0 ipeak = 12.5 ma sa sb continuous 5 ma current through ad or bd 150 ma p1, p2, p3, ld to gnd ? 0.4 to vcc + 0.4 v esd immunity (human body model) 1500 v min maximum power dissipation, 1 t a = 70 c t a = 85 c 1.67 w 1.33 w notes: 1. thermal limiting circuitry on chip will shut down the circuit at a junction temperature of about 165 c. the device should never see this temperature. operation above 145 c junction temperature may degrade device reliability. 2. rise time of vbh (dv/dt) must be limited to less than 27 v/ s. ambient temperature 0 to 70 c commercial ? 40 to +85 c extended temperature ambient relative humidity 15 to 85% vcc 5 v 5% vbl ? (vloopmax + 6 v + vpk) to vbh v vbh ? 42.5 v to ? 99 v bgnd with respect to gnd ? 100 mv to +100 mv load resistance on vtx to vref 20 k ? minimum load resistance on vsab to vref 20 k ? minimum
16 am79r241 datasheet specifications target specifications (see note 1) no. item condition min typ max unit note 1 two-wire loop voltage (including offset) standby mode, open circuit, |vbh| < 55 v |vbh| > 55 v any active mode (does not include oht), rl = 600 ? , i rsn = 50 a oht mode, rl = 2200 ? , i rsn = 20 a vbh ? 8 48 13.88 19.8 vbh ? 7 51 15 22 vbh ? 6 55.5 16.13 v3 2 feed resistance per leg at pins ad & bd standby mode 130 250 375 ? 3 3 feed current limit feed current standby mode, rl = 600 ? 34 45 ma imt current standby mode, rl = 2200 ? 44.6 56 a ilg current standby mode a to vbh b to ground 36 43 4 ternary input voltage boundaries for ld pin. mid-level input source must be vref. low boundary mid boundary high boundary input high current input low current mid-level current vref ? 0.3 cref ? 1 108 47 51 0.6 vref+0.3 v v v a a a ? ? ? 3 3 3 5 logic inputs p1, p2, p3 input high voltage input low voltage input high current input low current 2.0 -20 -20 0 0 0.8 20 20 v v a a 6 vtx output offset ? 50 0 +50 mv 7 vref input current vref = 1.4 v 50 a 3 8 cref input current cref = 3.3 v -3 0 3 a 3 9 , dc ratio of vsab to loop voltage: tj < 145 c, vsa ? vsb = 22 v 0.0088 0.0097 0.0106 v/v 10 fault indicator threshold voltage output on imt tbd cref ? 0.3 v cref v 3 11 gain from vlb pin to a or b pin, klg 30 v/v 12 vlb pin input current vlb = vref 1 v 0 100 a 3 13 iloop/imt iloop = 10 ma 275 300 325 a/a 14 ilong/ilg ilong = 10 ma 565 605 645 a/a 15 input current, sa and sb pins active modes 1.0 3.0 a 3 16 k1 incremental dc current gain 462.5 500 537.5 a/a 3 17 isa/imt disconnect isa = 2 ma 4 6 8.75 18 isb/ilg disconnect isb = 2 ma 10 12 16 19 vsab output offset tbd tbd tbd mv 20 imt output offset ? 30 3a 21 ilg output offset ? 10 1a v sab v sa v sb ? ------------------------- - =
am79r241 datasheet 17 relay driver specifications figure 5. relay driver configuration item condition min typ max unit note on voltage 25 ma/relay sink 40 ma/relay sink 0.4 0.8 0.5 1.0 v r2,r3 off leakage r2,r3 = bgnd rye = vbh 0 100 a zener break over iz = 100 a6.67.910v zener on voltage iz = 30 ma 6 11 17 v figure 5a. relay 1 driver r2 bgnd bgnd rye r3 bgnd r1
18 am79r241 datasheet am79r241 transmission specifications no. item condition min typ max unit note 1 rsn input impedance f = 300 to 3400 hz 1 ? 3 2 vtx output impedance 3 3 max, ac + dc loop current active high battery or active low battery 70 ma 4 longitudinal impedance, a or b to gnd active mode 70 135 ? 5 2-4 wire gain ? 10 dbm, 1 khz, 0 to 70 c t a = ? 40 c to 85 c ? 14.13 ? 14.18 ? 13.98 ? 13.98 ? 13.83 ? 13.78 db ? 3 6 2-4 wire gain variation with frequency 300 to 3400 hz, relative to 1 khz t a = ? 40 c to 85 c ? 0.1 ? 0.15 +0.1 +0.15 ? 3 7 2-4 wire gain tracking +3 dbm to ? 55 dbm reference: ? 10 dbm t a = ? 40 to 85 c ? 0.1 ? 0.15 +0.1 +0.15 3,6 8 4-2 wire gain ? 10 dbm, 1 khz t a = ? 40 c to 85 c ? 0.15 ? 0.2 +0.15 +0.2 ? 3 9 4-2 wire gain variation with frequency 300 to 3400 hz, relative to 1 khz ? 0.1 +0.1 ? 1 10 4-2 wire gain tracking +3 dbm to ? 55 dbm reference: ? 10 dbm ? 40 c to 85 c ? 0.1 ? 0.15 +0.1 +0.15 3, 6 11 total harmonic distortion level 2-wire 4-wire 4-wire overload level at vtx 300 hz to 3400 hz 0 dbm 11.2 dbm ? 12 dbm ? 0.8 dbm rload = 600 ? 1 ? 50 ? 40 ? 48 ? 38 db db db db vp ? ? ? ? 3 11b oht vab - 50 v 0 dbm 12 idle channel noise c-message psophometric weighted active modes, r l = 600 ? 2-wire t a = ? 40 to 85 c 4-wire 2-wire t a = ? 40 to 85 c 4-wire +7 tbd ? 7 ? 83 tbd ? 97 +11 ? 79 dbrnc dbmp ? 3 ? ? 3 ? 13 longitudinal balance (ieee method) normal polarity l - t 200 to 1000 hz t a = ? 40 c to 85 c 1000 to 3400 hz t a = ? 40 c to 85 c 58 53 53 48 ? 3 ? 3 t - l 200 to 3400 hz 40 db l - t, il = 0 50 to 3400 hz 63 4 reverse polarity l - t 200 to 1000 hz t a = ? 40 c to 85 c 50 48 ? 3 14 psrr (vbh, vbl) 50 to 3400 hz 3.4 to 50 khz 25 45 40 4, 5 2, 3, 5 15 psrr (vcc) 50 to 3400 hz 3.4 to 50 khz 25 45 35 4, 5 2, 3, 5 16 longitudinal ac current per wire f = 15 to 60 hz active mode 20 30 marms 3 17 metering distortion freq = 12 khz 2.8 vrms freq = 16 khz metering load = 200 ? 40 db 3
am79r241 datasheet 19 am79r241 ringing specifications am79r241 current-limit behavior am79r241 fault indications notes: 1. unless otherwise specified, test conditions are: vcc = 5 v, rmg1 = rmg2 = 1 k ? , bath = ? 90 v, batl = ? 36 v, rrx = 150 k ? , rl = 600 ? , rsa = rsb = 200 k ? , rfa = rfb = 50 ? , chp = 22 nf, cad = cbd = 22 nf, irsn = 50 a, active low battery. dc-feed conditions are normally set by the islac device. when the am79r241 is tested by itself, its operating conditions must be simulated as if it were connected to an ideal islac device. 2. these tests are performed with the following load impedances: frequency < 12 khz ? longitudinal impedance = 500 ? ; metallic impedance = 300 ? frequency > 12 khz ? longitudinal impedance = 90 ? ; metallic im pedance = 135 ? 3. not tested or partially tested in production. this parameter is guaranteed by characterization or correlation to other tests. 4. this parameter is tested at 1 khz in production. performance at other frequencies is guaranteed by characterization. 5. when the am79r241 and islac device is in the anti-sat operating region, this parameter is degraded. the exact degradation depends on system design. 6. ? 55 dbm gain tracking level not tested in production. this parameter is guaranteed by characterization and correlation to other tests. 7. this spec is valid from 0 v to vbl or ? 50 v, whichever is lower in magnitude. 8. other ringing-voltage characteristics are set by the islac device. item condition min typ max unit note peak ringing voltage active internal ringing vbh+3 gnd ? 3v 8 slic mode condition min typ max unit note disconnect applied fault between ground and t/r vbh applied to tip or ring 1 vbh/200k 100 a a 7 tip open ring short to gnd 24 35 46 ma standby short tip-to-vbh short ring-to-gnd 24 26 38 35 47 44 active ringing islac generating internal ringing 100 3 fault indication unit note no fault imt operates normally (vref 1v) thermal shutdown imt above 2.8 v 390 pf rt network 30 k 30 k vref
20 am79r241 datasheet operating modes the am79r241 receives multiplexed control data on the p1, p2 and p3 pins. the ld pin then controls the loading of p1, p2, and p3 values into the proper bits in the am79r241 control register. when the ld pin is less than 0.3 v below vref ( < (vref ? 0.3 v) ), p1 ? p3 must contain data for relay control bits rd1, rd2 and rd3. these are latched into the first three bits in the am79r241 control register. when the ld pin is more than 0.3 v above vref (> (vref + 0.3 v) ), p1 ? p3 must contain islic control data c1, c2, and c3, which are latched into the last three bits of the am79r241 control register. connecting the ld pin to vref locks the contents of the am79r241 control register. the operating mode of the am79r241 is determined by the c1, c2, and c3 bits in the control register of the am79r241. table 1 defines the am79r241 operating modes set by these signals. under normal operating conditions, the islic device does not have active relays. the am79r241 to islac device interface is designed to allow continuous real-time control of the relay drivers to avoid incorrect data loads to the relay bit latches of the am79r241 devices. to perform external ringing, the islac device from the intelligent access voice family is set to external ringing mode (rmode = 1), enables the ring relay, and puts the am79r241 in the standby mode. table 1. operating modes note: 1. in these modes, the ring lead (b-lead) output has a ? 50 v internal clamp to battery ground (bgnd). c3 c2 c1 operating mode battery voltage selection operating mode connection to rmgpi & rmgli resistors 000 standby 1 high battery (bath) and bgnd (high ohmic feed): loop supervision active, a and b amplifiers shut down open 001 tip open 1 high battery (bath) and bgnd tip open: ad at high-impedance, channel a power amplifier shut down open 0 1 0 on-hook transmission, fixed longitudinal voltage high battery (bath) and bgnd fixed longitudinal voltage of ? 28 v a and b amplifier output 0 1 1 disconnect low battery selection at vbl ad and bd at high-impedance, channel a and b power amplifiers shut down 1 0 0 rsvd active feed, normal or reverse polarity 1 0 1 active high battery high battery (bath) and bgnd 1 1 0 active low battery low battery (batl) and bgnd 1 1 1 active internal ringing high battery (bath) and bgnd active internal ringing
am79r241 datasheet 21 table 2. mode descriptions control bits rd1, rd2, and rd3 do not affect the operating mode of the am79r241. these signals usually perform the following functions. operating mode description disconnect this mode disconnects both a and b output amplifiers from the ad and bd outputs. the a and b amplifiers are shut down and the am79r241 selects the low battery voltage at the vbl pin. in the disconnect state, the currents on imt and ilg represent the voltages on the sa and sb pins, respectively. these currents are scaled to produce voltages across rmti and rlgi of and , respectively. standby the power amplifiers are turned o ff. the ad output is driven by an internal 250 ? (typical) resistor, which connects to ground. the bd output is driven by an internal 250 ? (typical) resistor, which connects to the high battery (bath) at the vbh pin, through a clamp circuit, which clamps at ? 50 v with respect to bgnd. for vbh values above ? 55 v, the open-circuit voltage, which appears at this output is ~vbh + 5 v. if vbh is below ? 55 v, the voltage at this output is ? 50 v. the battery selection for the balance of the circuitry on the chip is vbl. line supervision remains active. current limiting is provided on each line to limit power dissipation under short-loop conditions as specified in the ? am79241 current-limit behavior ? section. in external ringing, the standby islic state is selected. tip open in this mode, the ad (tip) lead is opened and the bd (ring) lead is connected to a clamp, which operates from the high battery on vbh pin and clamps to approximately ? 50 v with respect to bgnd through a resistor of approximately 250 ? (typical). the battery selection for the balance of the circuitry on the chip is vbl. to prevent excessive power dissipation, the current in the ring lead is limited by an internal current source to 30 ma. active high battery in the active high battery mode, battery connections are connected as shown in table 1. both output amplifiers deliver the full power level determined by the programmed dc-feed conditions. active high battery mode is enabled during a call in applications when a long loop can be encountered. active low battery both output amplifiers deliver the full power level determined by the programmed dc-feed conditions. vbl, the low negative battery, is selected in the active low battery mode. this is typically used during the voice part of a call. active internal ringing in the internal ringing mode, the am79r241 selects the battery connections as shown in table 1. when using internal ringing, both the ad and bd output amplifiers deliver the ringing signal determined by the programmed ringing level. on-hook transmission (oht), fixed longitudinal voltage in the on-hook transmission, fixed longitudinal voltage mode, battery connections are connected as shown in table 1. the longitudinal voltage is fixed at ? 30 v to allow compliance with safety specifications for some classes of products. v sa 400 --------- - v sb 400 --------- -
22 am79r241 datasheet table 3. driver descriptions thermal-management equations (all modes except standby) timing specifications notes: 1. the p1 ? 3 pins are updated continuously during operation by the ld signal. 2. after a power-on reset or hardware reset, the relay outputs from the am79r241 turn all relays off. an unassuming state is to place the relay control pins, which are level triggered, to a reset state for all relays. any noise encountered only raises the levels toward the register lock state. 3. when writing to the islic registers, the sequence is: a. set ld pin to mid-state b. place appropriate data on the p1 ? 3 pins c. assert the ld pin to high or low to write the proper data d. return ld pin to mid-state 4. am79r241 registers are refreshed at 5.33 khz when used with an islac device. 5. if the clock or mpi becomes disabled, the ld pins and p1 ? 3 returns to 0 v state, thus protecting the am79r241 and the line connection. 6. not tested in production. guaranteed by characterization. driver description r1 a logic 1 on rd1 turns the r1 driver on and operates a relay connected between the r1 pin and vccd. r1 drives the ring relay when external ringing is selected. r2 a logic 1 on the rd2 signal turns the r2 driver on and routes current from the r2 pin to the rye pin. in the option where the rye pin is connected to ground, the r2 pin can sink current from a relay connected to vccd. another option is to connect the rye pin to the bd (ring) lead and connect a test load between r2 and the ad (tip) lead. this technique avoids the use of a relay to connect a test load. however, it does not isolate the subscriber line from the linecard. the test load must be connected to the am79r241 side of the protection resistor to avoid damage to the r2 driver. r3 a logic 1 on the rd3 signal turns the r3 driver on and routes current from the r3 pin to the rye pin. in the option where the rye pin is connected to ground, the r3 pin can sink current from a relay connected to vccd. another option is to connect the rye pin to the b (ring) lead and connect a test load between r3 and the a (tip) lead. this technique avoids the use of a relay to connect a test load. however, it does not isolate the subscriber line from the linecard. the test load must be connected to the am79r241 side of the protection resistor to avoid damage to the r3 driver. i l < 5 ma p slic = ( s bat ? i lrl ) i l + 0.3 w p tmg = 0 tmg resistor-current is limited to be 5 ma < i l . if i l < 5 ma, no current flows in the tmg resistor and it all flows in the am79r241. i l > 5 ma p slic = ( s bat ? i l (r l + 2 r fuse ))*i l + 0.3 w ? p tmg p tmg = (i l ? 5 ma)^2 (r tmg1 + r tmg2 ) these equations are valid when r tmgx (i l ? 5ma) < ( s bat ? r l i l )/2 ? 2 because the longitudinal voltage is one-half the battery voltage and the tmg switches require approximately 2 v. symbol signal parameter min typ max unit trsld ld rise time am79r241 ld pin 2 s tfsld ld fall time am79r241 ld pin 2 tsldpw ld ld minimum pulse width 3 tsdxsu p1,p2,p3 p1 ? 3 data setup time 4.5 tsdxhd p1,p2,p3 p1 ? 3 data hold time 4.5 tsdxd p1,p2,p3 max p1 ? 3 data delay 5
am79r241 datasheet 23 waveforms detail a t sdxsu t sdxhd t sldpw tr sld tf sld ld p1,p2,p3 0v vref vcc write relay register write state register lock registers ld p1,p2,p3 relay data state data write state register write relay register new relay data previous relay data vref vref
24 am79r241 datasheet physical dimensions revision summary revision h to revision i page 11, figure 3, dt1i was added and the last note was modified. page 12, figure 4, dt1i was added and the last note was modified. page 15, electrical characteristics, numbers changed in the max column. page 16, absolute maximum ratings, the "humidity" row was deleted. page 17, specifications, there were changes to rows one, four, six, 12, and 17 ? 21, and to the note column. page 18, relay driver specifications, there were changes in the last two rows. page 19, transmission specifications, there were changes to rows, six, eight, 10, and 13, and to the note column. page 20, fault indications, "ilg operates normally" was deleted from the indication column on the second row. .050 ref. .026 .032 top view pin 1 i.d. .485 .495 .447 .453 .585 .595 .547 .553 16-038fpo-5 pl 032 da79 6-28-94 ae side view seating plane .125 .140 .009 .015 .080 .095 .042 .056 .013 .021 .400 ref. .490 .530
notes: www.legerity.com
legerity provides silicon solutions that enhance the performance, speeds time-to-market, and lowers the system cost of our customers' products. by combining process, design, systems architecture, and a complete set of software and hardware support tools with unparalleled factory and worldwide field applications support, legerity ensures its customers enjoy a smoother design experience. it is this commitment to our customers that places legerity in a class by itself.
the contents of this document are provided in connection with legerity, inc. products. legerity makes no representations or war ranties with respect to the accuracy or completeness of the contents of this publication and reserves the right to make changes to specifica tions and product descriptions at any time without notice. no license, whether express, implied, arising by estoppel or otherwise, to any intelle ctual property rights is granted by this publication. except as set forth in legerity's standard terms and conditions of sale, legerity assumes no li ability whatsoever, and disclaims any express or implied warranty, relating to its products including, but not limited to, the implied warranty of merchantability, fitness for a particular purpose, or infringement of any intellectual property right. legerity's products are not designed, intended, authorized or warranted for use as components in systems intended for surgical implant into the body, or in other applications intended to support or sustain life, or in any other application in which the failure of legerit y's product could create a situation where personal injury, death, or severe property or environmental damage may occur. legerity reserves the right to discontinue or make changes to its products at any time without notice. ? 2000 legerity, inc. all rights reserved. trademarks legerity, the legerity logo, and combinations thereof, intelligent access, islac, islic, and winslac are trademarks of legerity , inc. other product names used in this publication are for identification purposes only and may be trademarks of their respective com panies.
p.o. box 18200 austin, texas 78760-8200 telephone: (512) 228-5400 fax: (512) 228-5510 north america toll free: (800) 432-4009 to contact the legerity sales office nearest you, or to download or order product literature, visit our website at www.legerity.com. to order literature in north america, call: (800) 572-4859 or email: americalit@legerity.com to order literature in europe or asia, call: 44-0-1179-341607 or email: europe ? eurolit@legerity.com asia ? asialit@legerity.com

▲Up To Search▲

Price & Availability of AM79R241JC

	To Download AM79R241JC Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .