View MH88500IN_1319142.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

obsolescence notice this product is obsolete. this information is available for your convenience only. for more information on zarlink?s obsolete products and replacement product lists, please visit http://products.zarlink.com/obsolete_products/
1 features differential to single ended conversion no transformers required minimum installation space off-hook detection and led indicator drive relay drive output battery and ringing feed to line logic interface: mute , ofhk , rc mute of incoming audio dial pulse detection voltage surge protection applications line interface for: pabx intercoms key systems description the zarlink MH88500IN 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 MH88500IN 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 in a 20-pin ?ingle-in- line package allowing optimum circuit board packing density. figure 1 - functional block diagram junctor mute ofhk led thresh adj v c2 v a2 v b v c1 gnd va 1 tip ring ring feed cd rd rc rgnd v a2 v b speech circuit loop detection loop feed/ ring feed relay drive circuit issue 1 april 1995 ordering information MH88500IN 20 pin sil package 0 c to 70 c MH88500IN hybrid subscriber line interface circuit (slic) preliminary information
2 MH88500IN 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. 2v a1 positive line feed supply voltage . normally connected to v a2 . 3 ring ring lead. connects to the ?ing lead (b-wire) of the telephone line. 4 ring feed negative line feed voltage and ringing input. normally connected to ring relay. 5ic internal connection. leave open circuit. use for testing only. 6v c1 sense input. normally connected to negative line feed voltage supply. 7 gnd analog ground (0v). internally connected to pin 13. 8v b negative analog supply voltage . 9 led led drive output. drives an led directly. off-hook condition, logic low. 10 ofhk logic low output. indicates closed loop condition (off-hook and dial pulsing). 11 thresh adj allows adjustment of ofhk detection threshold. 12 v a2 positive power supply voltage. normally connected to v a1 . 13 gnd analog ground (0v). internally connected to pin 7. 14 v c2 loop detector voltage supply. connected to negative line feed voltages supply. 15 mute input mutes the incoming audio. active low. 16 junctor receive/transmit audio speech path . (referenced to 0v gnd) 17 rd relay drive output. open collector sinks current when rc high. diode clamp protected. 18 rgnd ground for relay drive circuit . 19 rc ring control input . active high. 20 cd clamping diode . normally connected to relay positive voltage. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 tip va1 ring ic vc1 gnd v b led ofhk thresh adj va2 gnd vc2 mute junctor rd rgnd rc cd ring feed
3 preliminary information MH88500IN functional description speech circuit the speech circuit converts the bidirectional tip and ring line pair to a bidirectional single ended junctor line. figure 3 illustrates a typical connection between two slics through two crosspoint switches. this con?uration gives optimum transhybrid loss as seen from figure 4 given that the output impedance of the junctor line is 604 ? . the mute input mutes signals coming from tip and ring to the junctor line while allowing the signal from the junctor to the tip-ring pair to be transmitted. loop detection the loop detection circuit determines whether a low enough impedances is across tip and ring to be recognized as an off-hook condition. (threshold impedance = 5.4k ? with no adjustment) this threshold level can be adjusted by the use of external resistors as shown in figure 6. ofhk has low output drive capability so it may drive cmos operating with different power supplies. line feed/ring feed circuit the line feed circuit provides loop current and the ability to apply ringing onto tip and ring. the impedance from ring feed to gnd is 600 ? which gives the loop current as: il = v oltage at ring feed pin amps telephone impedance + 600 the positive supply for the line feed circuit is v a1 through the loop current is determined from ring feed and gnd. relay drive circuit the relay drive circuit switches ringing onto ring feed (fig.7). the diode is present to suppress voltage transients during relay switches caused by the inductive coils of the relay. ringing voltage includes ac ringing (90v typically) an ddc line feed voltage (-24v typically). figure 3 - slic crosspoint switch connection MH88500IN MH88500IN tip ring tip ring tip ring tip ring junc junc 75 ? 75 ? crosspoint switch crosspoint switch 16 16 1 3 1 3
4 MH88500IN preliminary information absolute maximum ratings ? ? exceeding these values may cause permanent damage. functional operation under these conditions is not implied. ? 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. note 1: 754 ? connected between junctor (pin 16) and 0v. note 2: 604 ? connected between tip (pin 1) and ring (pin 3). parameter symbol min max units 1 voltage supplies - v ref to gnd v a1, v a2 v v b -18 +18 v v c1 , v c2 -35 v 2 clamp diode breakdown voltage-v ref to rgnd v cd +15 v 3 operating temperature t amb 0 +70 ?c 4 storage temperature t stg -40 +100 ?c 5 power dissipation p d 1.2 watt ac electrical characteristics ? voltages are with respect to ground (v ss ), ta = 25?c, unless otherwise stated. test conditions unless noted, v a1 =v a2 =+7v, v b =8v, v c2 =-24v(+ 5%). characteristics sym min typ max units test conditions 1 junctor to differential output (tip- ring) gain. a jl 0.8 1.0 0 1.2 v/v db 1khz, 400mv rms source on pin 16. note 2 2 differential input (tip-ring) to junctor gain a lj 0.8 1.0 0 1.2 v/v db 1khz, 1v rms source on pins 1&3. note 1,2 3 on/off hook detection threshold loop resist loop current r thresh i thresh 4.0 3.6 5.4 4.0 6.0 5.3 k ? ma note 1 note 1 4 trans hybrid loss 55 db notes 1,2. see figure 2 5 passband linearity + 1 db notes 1,2 6 power supply rejection ratio (vc to junctor) psrr 40 db notes 1,2 7 common mode rejection ratio (tip and ring to junctor) cmrr 40 db notes 1,2 8 low frequency cutoff (3db) junctor to line line to junctor f llj f ljl 53 20 hz hz notes 1,2 notes 1,2 9 high frequency cutoff (3db) line to junctor junctor to line f hlj f hjl 800 500 khz khz notes 1,2 notes 1,2 10 longitudinal balance 65 db note 1 11 tip (or ring) to ground ac input impedance z i 300 ? 12 junctor output impedance z oj 604 ?
5 preliminary information MH88500IN . dc electrical characteristics typical ?ures are at 25 c with nominal+ 5v supplies and are for design aid only: not guaranteed and not subject to production testing. figure 4 - return loss vs junctor load impedance characteristics sym min typ max units test conditions 1 s u p p l y operating supply voltages v a1 ,v a2 v b v c1 ,v a2 -13 -30 -24 +13 -20 v v v 2 operating supply currents i a1 i a2 i b i c1 i c2 7 8 6 .2 .1 ma ma ma ma ma 3 i n p u t s high level input voltage mute rc v ih v ih 4.2 3 v v 4 low level input voltage mute rc v il v il .8 1 v 5 high level input current mute rc i ih i ih -28 700 a a 6 low level input current mute rc i il i il 100 1 a a 7 o u t p u t s sink current led rd i led i rd 2 65 6 100 ma ma v ofhk ,-6v cd=rc=5v,rgd=0v v rrd <1.5v 8 diode clamp current i rly 65 100 ma rc=rgnd=0v, cd=5v v rrd <1.5v 9 high level output voltage v oh 6 v led unconnected 10 low level output voltage ofhk v ol -6.5 v led unconnected 11 high level output current i oh 10 a 12 low level output current i ol 10 ? 10 20 30 40 50 60 550 600 650 700 750 800 850 900 950 transhybrid loss (db) load impedance on junctor ( ? )
6 MH88500IN preliminary information figure 5 - transhybrid loss test circuit figure 6 - off-hook threshold adjust 5 1 3 16 1 5 16 604 ? 604 ? vtr vtr vo 10 f 200 ? 10h 54 ? vs 3 754 ? vx can be measured that v tp =2vx=2v tr (a) transhybrid loss = - 20log (v o ) (b) 2vs MH88500IN MH88500IN r r gnd MH88500IN thresh adj MH88500IN 11 11 vc2 thresh adj 120 100 80 60 40 20 1 2 3 456 2000 1000 10 20 30 40 r r (k ? ) (k ? ) r thresh (k ? ) (b) r thresh (k ? ) (a) (48 x r thresh ) -28.8 5.4 - r thresh (912 x r thresh ) +604 r thresh - 5.4 r and r thresh (k ? ) (a) r and r thresh (k ? ) (a) r = r =
7 preliminary information MH88500IN figure 7 - relay drive circuit tip ring ring feed cd rd rgnd relay coil line feed/ ring feed clamp diode relay drive circuit +v v a1 MH88500IN rc -24vdc -24vdc +90vac
8 MH88500IN preliminary information figure 8 - pabx typical application -24vdc 90vac -24vdc -24vdc 90vac -24vdc -24vdc 90vac -24vdc -8v -24v 0v +7v +5v +5v -8v -24v 0v +7v +5v +5v -8v -24v 0v +7v +5v +5v control logic address out 00 01 02 03 04 05 06 07 a0 a1 a2 a0 a1 a2 00 01 02 03 04 05 06 07 a 0 -a 2 /d 0 -d 3 mt8812 crosspoint switch j 0 j 1 j 2 j 3 -l 7 l 0 MH88500IN MH88500IN MH88500IN a0 a1 a2 select output d 0 d 1 d 2 | | d 7 2 12 9 20 17 4 1 3 tip ring 7 14 6 8 16 10 19 15 15 19 10 16 8 6 14 7 3 1 ring tip 4 17 20 9 12 2 15 19 10 16 8 614 7 ring tip 3 1 4 17 20 9 12 2 md74sc137 1 of 8 decoder md74sc137 1 of 8 decoder 5 more slics 5 more slics cmos 4512 8-input mux
9 preliminary information MH88500IN figure 9 -mechanical data 2.00 + 0.020 (50.8 + 0.5) 0.52+ 0.02 (13.2+ 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) 1 2 3 4 19 20 notes: 1) not to scale 2) dimensions in inches). 3) (dimensions in millimetres). *dimensions to centre of pin & tolerance non accumulative.
10 MH88500IN preliminary information notes :
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

▲Up To Search▲

Price & Availability of MH88500IN

	To Download MH88500IN Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .