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1 features high gain version mh88511 compatible with popular mh88500 operates with a wide range of battery voltages constant current battery feed dry line compatible overvoltage and short circuit protection ringing feed off-hook detection and led indicator drive dial pulse detection ring trip ?ter with auto ring trip relay driver transformerless 2-2 wire conversion low power consumption mute of incoming audio few external components applications line interface for: pabx intercoms key systems description the zarlink mh88510/11 subscriber line interface circuit provides a complete interface between the telephone line and a speech switch requiring only single bidirectional switch per crosspoint. the functions provided by the mh88510/11 include bidirectional differential to single ended conversion in the speech path, line battery feed, ringing feed and loop and dial pulse detection. the device is fabricated as a thick ?m hybrid which incorporates various technologies for optimum circuit board and very high reliability. tf tip ring rf vbat agnd vdd vee shk led rrc rrd vrly rgnd mute junc tip drive current & voltage sensing ring short protection 2-2 wire hybrid constant current/voltage control ring trip filter line supervision relay driver issue 1 april 1995 ordering information mh88510 20 pin sil package mh88511 20 pin sil package 0 c to 70 c figure 1 - functional block diagram mh88510/11 subscriber line interface circuit (slic) preliminary information
2 mh88510/11 preliminary information figure 2 - pin connections pin description pin # name description 1 tip tip lead. connects to the ?ip lead (a-wire) of the telephone line. 2 vdd positive power supply voltage. normally +5v. this provides current for both internal circuitry as well as the loop. not internally connected to pin 12. 3 ring ring lead. connects to the ?ing lead (b-wire) of the telephone line. 4rf ring feed. connect to the ring relay contact. see figure 5. 5 tf leave open circuit 6 vbat battery voltage supply. normally -24v or -48v. not internally connected to pin 14. 7 agnd analog ground. supply and battery ground. internally connected to pin 13. for optimum performance connect pin 7 to pin 13. 8v ee negative power supply voltage . normally -5v. 9 led led drive (output). drives an led directly. a logic low indicates an off-hook condition. 10 shk switch hook detect (output). a logic low indicates an off-hook condition. 11 ic internal connection . this pin is connected internally 12 v dd positive power supply voltage. normally +5v. this provides current for both internal circuitry as well as the loop. 13 agnd analog ground. supply and battery ground. internally connected to pin 13. for optimum performance connect pin 13 to pin 7. 14 v bat battery voltage supply. normally -24v or -48v. not internally connected to pin 6. 15 mute mute (input) . a logic low will mute signals coming from tip-ring to the junc. 16 junc receive/transmit audio speech path . (referenced to 0v gnd). 17 rrd ring relay drive (output). connects to the ring relay coil. a logic low activates the relay. 18 rgnd relay ground. return path for relay supply votlage. normally connected to agnd. 19 rrc ring relay control (input) . a logic high activates the ring relay drive (rrd ) outputs. 20 vrly relay positive supply voltage. normally +5v. connects to the relay coil and the relay supply voltage. an internal clamp diode from vrly to rgnd is provided. tip vdd ring tf vbat agnd vee led shk ic vdd agnd vbat mute junctor rrd rf 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
3 preliminary information mh88510/11 functional description the borsh functions the mh88510/11 performs all of the borsh functions of battery feed, overvoltage protection, ringing, supervision and hybrid (2-2 wire). battery feed the mh88510/11 powers the telephone set with constant dc loop current for shortlines and automatically reverts to constant voltage for long lines. since the tip drive is powered down from the v dd supply, loop current ?ws through both the v bat supply and the v dd supply. overvoltage protection the mh88510/11 is protected from short term (20ms) transients (+250v) between tip and ring, tip and ground, and ring and ground. however additional protection circuitry may be needed depending on the requirements which must be met. normally, simple external shunt protection as shown in figures 5 and 6 is all that is required. ringing the ringing insertion circuitry has the capability to provide ringing voltage to the telephone set by simply adding an external relay, ring generator and a 200 ? limiting resistor. the internal relay driver switches ringing voltage on to the line via the external ring relay. the slic provides two internal 300w battery feed resistors through which the ringing current will ?w. a clamp diode is included which suppresses voltage transients during relay switching caused by the relay coil. in addition, the circuit prevents connection of the ringing source during off-hook conditions. see ?ure 5 for typical application. hybrid the 2-2 wire hybrid circuit converts the incoming balanced signal at tip and ring of the telephone line into a ground referenced output signal at junc of the slic, and converts the ground referenced input signal at junc of the slic into a non-balanced output signal at tip and ring of the telephone line. line impedance the mh88510/11s tip-ring(zin) impedance is ?ed at 600 ? . for correct slic impedance, junc must be appropriately terminated. see ac electrical characteristics. supervision the loop detection circuit determines whether a low enough impedance is across tip and ring to be recognised as an off-hook condition. when an off- hook condition occurs, the shk and led outputs toggle to a logic low level. these outputs also toggle during incoming dial pulses. figure 3 - slic crosspoint switch connection mh88510/11 mh88510/11 tip ring tip ring tip ring tip ring junc junc 75 ? 75 ? crosspoint switch crosspoint switch 16 16 1 3 1 3 slic 1 slic 2
4 mh88510/11 preliminary information the shk output has low drive capability while the led output can drive an led directly. the detection circuit engages a ringing ?ter during applied ringing. the ringing ?ter ensures that the shk output toggles at the ringing cadence and not at the ringing frequency. the ring trip detection circuit also prevents false off-hook detection due to the current associated with the ac ringing voltage as well as current transients when the ringing votlage is switched in and out. hybrid the 2- wire hybrid circuit converts the incoming balanced signal at tip and ring of the telephone line into a ground referenced output signal at junc of the slic, and converts the ground referenced input signal at junc of the slic into a non-balanced output signal at tip and ring of the telephone line. return loss at tip-ring to maximise return loss, the impedance at tip-ring should match the slics impedance (600 ? ). however, the slics input impedance is dependent on the junc termination resistance. for a 600 ? slic input impedance, the junc must be terminated with 754 ? . figure 2 illustrates a typical connection between two slics through two crosspoint switches. optimum return loss occurs when junc is terminated with 754 ? . since the junc input/output is 604 ? and the crosspoint switches resistance are 75 ? + 75 ? , this con?uration gives optimum return loss as shown in figure 3. mute a logic low at the mute input results on, muted signals coming from tip and ring to the junc terminal while allowing signals from the junc terminal to tip and ring to be transmitted. tip-ring drive circuit the audio input ground referenced signal at junc is converted to a differential output signal at tip and ring. the output signal consists of the audio signal superimposed on the dc battery feed current. the tip-ring drive circuit is optimsed for good 2-wire longitudinal balance. in addition, the tip-ring drive circuit has the capability to drive a dry line (a line with no dc current ?wing); the ac electrical characteristics apply (except for longitudinal balance), even when the loop current drops to zero. therefore, the mh88510 has the capability to drive a line much longer than 2000 ? providing the user is not concerned with loop current, shk detection or ringing generator current. short circuit protection the mh88510 is protected from long term (in?ite) short circuit conditions occurring between tip and ring, tip and agnd, and ring and agnd. line impedance the mh88510s tip-ring (zin) impedance is ?ed at 600 ? . for correct slic impedance, junc must be appropriately terminated. see ac electrical characteristics. transmit and receive gain transmit gain (junc to tip-ring) and receive gain (tip-ring to junc) are ?ed. for correct gain, the slic input impedance must match the line impedance and junc must be appropriately terminated.
5 preliminary information mh88510/11 figure 4 - return loss vs junctor load impedance figure 5 - typical application circuit 10 20 30 40 50 60 550 600 650 700 750 800 850 900 950 typical return loss load impedance on junctor ( ? ) (db) tip ring ringing generator 90vrms optional protection circuit k1 r1 -48v -5v c1 c2 +5v k1 ds1 audio input/output mute control input switch hook output off-hook led ring control input tip ring rf1 vbat vee agnd vdd rgnd vrly rrd led shk mute junc rrc 1 3 4 6,14 8 13 12 18 20 17 19 9 10 15 16 mh88510/11 notes: r1= 200 ? , 1/4w, 5% k1= relay e/m 5v, 1 form c c1, c2 = 0.1uf, 50v, ceramic ~
6 mh88510/11 preliminary information absolute maximum ratings ? ? exceeding these values may cause permanent damage. functional operation under these conditions is not implied. typical ?ures are at 25 c with nominal+ 5v supplies and are for design aid only: not guaranteed and not subject to production testing. ? dc electrical characteristics are over recommended operating conditions with v dd at +5.0v and v ee at -5v 5% unless otherwise stated. typical ?ures are at 25 c with nominal+ 5v supplies and are for design aid only: not guaranteed and not subject to production testing. supply current and power consumption characteristics are over recommended operating conditions with v dd at 5.0v, v ee at -5.0v and v bat at -48v. note that loop current ?ws through both the v bat and the v dd supply. shk output consists of a 100k ? resistor in series with an op-amp with a minimum output voltage swing of 3.25v. led outputs consists of a 2.5k ? resistor in series with shk op-amp output. rrc input consists of a 5kw resistor in series with the base lead of the relay driver transistor (grounded emitter). the mute input is internally pulled up. with no input connection, the voltage level at the mute input is typically at 1.5v. parameter symbol min max units 1 dc supply voltage v dd v ee -0.3 0.3 15 -15 v v 2 dc battery voltage v bat 0.3 -60 v 3 dc relay voltage v rly -0.3 20 v 4 ac ring generator voltage 150 v rms 5 storage temperature t s -55 125 ?c characteristics sym min typ max units test conditions 1 dc supply voltage v dd v ee 4.75 -4.75 5.0 -5.0 7.35 -8.40 v v 2 dc battery voltage v bat -23 -48 -56 v 3 dc relay voltage v rly 5.0 15 v 4 ac ring generator voltage ringing generator frequency 17 90 105 33 v rms hz 5 operating temperature t op 070?c dc electrical characteristics ? characteristics sym min typ max units test conditions 1 supply current: open loop normal loop short loop i dd i ee i bat i dd i ee i bat i dd i ee i bat 15 15 15 43 15 43 43 15 43 ma ma ma ma ma ma ma ma ma r loop = open r loop = 1000 ? r loop = 0 ? 2 power consumption : open loop normal loop short loop pc pc pc 880 2360 2360 mw mw mw r loop = open r loop = 1000 ? r loop = 0 ? 3 low level output voltage high level output voltage v ol v oh -3.0 3.0 v v i ol = 2 a i oh = 2 a 4 sink current, led to agnd sink current, led to vdd i ol i oh 0.6 2.5 ma ma v ol = -1.5v v ol = 3.25v 5 sink current, relay to vdd clamp diode current i ol i cd 100 150 ma ma v ol = 0.35v 6 high level input voltage v ih 3.5 v i il = 1.0ma 7 low level input voltage v il 0.8 v i il = 0.5ma
7 preliminary information mh88510/11 ac and dc loop electrical characteristics* * ac and dc loop electrical characteristics are over recommended operating conditions unless otherwise stated. typical ?ures are at 25 c with nominal + 5v supplies and are for design aid only. the slic can be loaded with an ac impedance as low as 2200 ? without generating a false shk output. since each ren represents 8k ? , the slic can drive a ren of 3.6 without generating a false shk output. see section on tip-ring drive circuit for driving longer lines. ac electrical characteristics typical ?ures are at 25 c with nominal + 5v supplies and are for design aid only. characteristics sym min typ max units test conditions 1 maximum ac ringing current rejection 44 ma 2 ring trip detect time 125 ms 3 operating loop current v bat = -48v v bat = -23v i ip 18 18 23 23 28 28 ma ma r loop < 2000 ? r loop < 600 ? 4 maximum operating loop resistance v bat = -48v v bat = -23v r ip 2000 600 ? ? i loop = 18ma i loop = 18ma 5 loop current at off-hook detect threshold i sh 8 9 10 11 12 13 a a v dd = 5.0v, v ee = -5.0v v dd = 7.0v, v ee = -8.0v characteristics sym min typ max units test conditions 1 return loss at 2-wire 20 30 db reference 600 ? @ 1khz 2 impedance at junctor 604 ? 3 longitudinal to metallic balance 50 60 db 40hz - 4khz 4 longitudinal to junctor balance 50 60 db 40hz - 4khz 5 signal output overload level at 2-wire at junctor 3.5 3.5 dbm dbm % thd < 5% reference: 600 ? reference: 754 ? 6 total harmonic distortion at 2-wire at junctor thd 1.0 1.0 % % input 0.5v 1khz 7 idle channel noise at 2-wire at junctor nc 12 12 dbrnc dbrnc reference: 600 ? reference: 754 ? 8 power supply rejection ratio at 2-wire and junctor v dd v ee v bat psrr 25 25 25 db db db ripple 0.1v 1khz 9 mute attenuation 30 db input 0.5v mute = 0.0v @1khz
8 mh88510/11 preliminary information ac gains table - mh88510 typical ?ures are at 25 c with nominal + 5v supplies and are for design aid only. ac gains table - mh88511 ? ? ac electrical characteristics are over recommended operating conditions unless otherwise stated. typical ?ures are at 25 c with nominal + 5v supplies and are for design aid only. note1:all of the above test conditions use 754 ? connected between junc and grd, and 600w connected between tip and ring unless otherwise stated. note 2:all of the above test conditions use 200hz to 6400hz unless otherwise stated. figure 6 - typical protection circuit characteristics sym min typ max units test conditions 1 gain 2-wire to junctor 1.05 0.42 1.12 0.98 1.19 1.51 v/v dbv input 0.5v 1khz input 0.5v 1khz 2 frequency response gain (relative to gain at 1khz) -0.3 0.3 db 200hz - 3400hz 3 gain junctor to 2-wire 0.96 -0.35 1.00 0.0 1.04 0.35 v/v dbv input 0.5v 1khz input 0.5v 1khz 4 frequency response gain (relative to gain at 1khz) -0.3 0.3 db 200 z - 3400hz characteristics sym min typ max units test conditions 1 gain 2-wire to junctor 1.15 0.21 1.19 1.50 1.22 1.72 v/v dbv input 0.5v 1khz input 0.5v 1khz 2 frequency response gain (relative to gain at 1khz) -0.3 0.3 db 200hz - 3400hz 3 gain junctor to 2-wire 1.04 0.34 1.08 0.67 1.11 0.91 v/v dbv input 0.5v 1khz input 0.5v 1khz 4 frequency response gain (relative to gain at 1khz) -0.3 0.3 db 200hz - 3400hz tip ring mh88510/11 agnd protection circuit tip ring rv3 rv2 rv1 earth ground system ground 1 3 7 notes rv1,2,3 = 175vac, 225vac, 15j ge v175la2 or similar
9 preliminary information mh88510/11 figure 7 - mh88511 as a trunk interface application figure 8a - line to line mh88511 j t r t1 c2 r1 r2 q1 r3 c4 d3 d6 d4 d5 q2 c3 q3 r7 +5v d8 c5 r4 c6 r6 r5 d7 +5v r9 var1 til111 ring det var2 r8 var3 2 6 4 5 1 tip relay line seize ring d9 components d1,d2,=in4732 d3,d4,d5,d6,d7=in4003 d8=in4148 d9=in5246b var1,var2,var3-v130la20a c1,c3=10 f,60v,5% c2=1.0 f,100v,5% c4=0.1 f,100v,5% c5=0.01 f,100v,5% c6=0.33 f,200v,5% r1=1/4w,1%,6.8k r2,r5=1/4w,10%,10k r3=1/2w,10%,50 ? r4=1/4w,10%,680 ? r6=1/4w,10%,100k ? r7=1/4w,10%,1k ? r8,r9=1/2w,10%,10 ? q1=mpsa90 q2=zn6716 q3=bc238 t1=fil tran tpf712 (or equivalent) 600 ? :1 1 3 c1 d2 d1 mh88510 mt8816 mh88510 1db -2db 0db 0db 1db -1db -1db
10 mh88510/11 preliminary information figure 8b- line to line figure 9 - mechanical data mh88511 mt8816 mh88510 1db -2db 0db 1.2db -0.7db -0.7db -0.2db 0db -0.2db c.o. t1 2.00 + 0.020 (50.8 + 0.5) 0.58+ 0.02 (14.7+ 0.5) 0.12 max (3.1 max) 0.010 + 0.002 (0.25 + 0.05) 0.080 max (2.0 max) side view 0.05 + 0.01 (1.3 + 0.5) *** 0.05 + 0.02 (1.3 + 0.05) 0.020 + 0.05 (0.51 + 0.13) 0.100 + 0.10 (2.54 + 0.13) 0.18 + 0.02 (4.6 + 0.5) 12 34 1920 notes: 1) not to scale 2) dimensions in inches). 3) (dimensions in millimetres). *dimensions to centre of pin & tolerance non accumulative.
www.zarlink.com information relating to products and services furnished herein by zarlink semiconductor inc. trading as zarlink semiconductor o r its subsidiaries (collectively zarlink ) is believed to be reliable. however, zarlink assumes no liability for errors that may appear in this publication, or for liabil ity otherwise arising from the application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. neither the supply of such information or purchase of product or service conveys any license, either e xpress or implied, under patents or other intellectual property rights owned by zarlink or licensed from third parties by zarlink, whatsoever. purchasers of produc ts are also hereby notified that the use of product in certain ways or in combination with zarlink, or non-zarlink furnished goods or services may infringe patents or o ther intellectual property rights owned by zarlink. this publication is issued to provide information only and (unless agreed by zarlink in writing) may not be used, applied or re produced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. the products, t heir specifications, services and other information appearing in this publication are subject to change by zarlink without notice. no warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. information concerning possible methods of use is provided as a guide onl y and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. it is the user s responsibility to fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. man ufacturing does not necessarily include testing of all functions or parameters. these products are not suitable for use in any medical products whose failure t o perform may result in significant injury or death to the user. all products and materials are sold and services provided subject to zarlink s conditions of sale which are available on request. purchase of zarlink s i 2 c components conveys a licence under the philips i 2 c patent rights to use these components in and i 2 c system, provided that the system conforms to the i 2 c standard specification as defined by philips. zarlink and the zarlink semiconductor logo are trademarks of zarlink semiconductor inc. copyright 2001, zarlink semiconductor inc. all rights reserved. technical documentation - not for resale for more information about all zarlink products visit our web site at
www.zarlink.com information relating to products and services furnished herein by zarlink semiconductor inc. or its subsidiaries (collectively ?zarlink?) is believed to be reliable. however, zarlink assumes no liability for errors that may appear in this publication, or for liability otherwise arising from t he application or use of any such information, product or service or for any infringement of patents or other intellectual property rights owned by third parties which may result from such application or use. neither the supply of such information or purchase of product or service conveys any license, either express or implied, u nder patents or other intellectual property rights owned by zarlink or licensed from third parties by zarlink, whatsoever. purchasers of products are also hereby notified that the use of product in certain ways or in combination with zarlink, or non-zarlink furnished goods or services may infringe patents or other intellect ual property rights owned by zarlink. this publication is issued to provide information only and (unless agreed by zarlink in writing) may not be used, applied or re produced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. the products, t heir specifications, services and other information appearing in this publication are subject to change by zarlink without notice. no warranty or guarantee express or implied is made regarding the capability, performance or suitability of any product or service. information concerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. it is the user?s responsibility t o fully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not b een superseded. manufacturing does not necessarily include testing of all functions or parameters. these products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. all products and materials are sold and services provided subject to zarlink?s conditi ons of sale which are available on request. purchase of zarlink?s i 2 c components conveys a licence under the philips i 2 c patent rights to use these components in and i 2 c system, provided that the system conforms to the i 2 c standard specification as defined by philips. zarlink, zl and the zarlink semiconductor logo are trademarks of zarlink semiconductor inc. copyright zarlink semiconductor inc. all rights reserved. technical documentation - not for resale for more information about all zarlink products visit our web site at

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