View MH88636-4_5958138.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obsolescence notice this product is obsolete.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/
2-287 zfeatures ? loop start trunk interface ? 900 w input impedance ? 2-4 wire conversion ? on-hook reception ? line state detection outputs: - forward loop - reverse loop - switch hook - ringing voltage ? relay driver ? industrial temperature range option ? dil and smt versions ? meets fcc part 68 leakage current requirements applications interface to central of?ce for: ? pabx ? key telephone systems ? channel bank ? voice mail ? terminal equipment ? digital loop carrier ? optical multiplexer description the mitel MH88636-4 central of?ce trunk interface circuit provides a complete analog and signalling link between audio switching equipment and a subscriber line. the device is fabricated as a thick ?lm hybrid technology for optimum circuit design and very high reliability for both commercial and industrial temperature changes. figure 1 - functional block diagram status detection receive gain transmit gain 2 - 4 wire hybrid line termination loop relay driver network balance xla xlb xlc xld lrc lrd vrly tip r v vcc rx tx vee agnd fl rl shk ring & impedance matching issue 2 january 1997 ordering information mh88636ad-4i 28 pin dil package -40 c to 85 c mh88636ad-4 28 pin dil package mh88636as-4 28 pin smt package 0 c to 70 c MH88636-4 central of?ce interface circuit preliminary information
MH88636-4 preliminary information 2-288 figure 2 - pin connections pin description pin # name description 1 xlb loop relay contact b. connects to xla through the loop relay contacts (k1) when the relay is activated. 2 xlc loop relay contact c. connects to xld through the loop relay contacts (k1) when the relay is activated. 3ic internal connection. no connection should be made to this pin. 4 tip tip lead. connects to the tip lead of a telephone line. 5 ring ring lead. connects to the ring lead of a telephone line. 6 - 11 ic internal connection. no connection should be made to this pin. 12 rl reverse loop detect. in the on-hook status, a logic 0 output indicates that reverse loop battery is present. in the off-hook state, a logic 0 output indicates that reverse loop current is present. 13 fl forward loop detect. in the on-hook status, a logic 0 output indicates that forward loop battery is present. in the off-hook state, a logic 0 output indicates that forward loop current is present. 14 r v ringing voltage detect (output). a logic 0 indicates that ringing voltage is across the tip and ring leads. 15, 16, 19 ic internal connection. no connection should be made to this pin. 17 tx transmit (output). 4 wire ground (agnd) referenced analog output. 18 rx receive (input). 4 wire ground (agnd) referenced analog input. 20 shk switch hook (output). a logic 0 indicates the presence of forward or reverse battery when lrc is logic 0 and the presence of forward or reverse loop current when lrc is logic 1. 21 lrc loop relay control (input). a logic 1 activates the loop relay driver output ( lrd). 22 vee negative power supply. -5v dc 23 agnd analogue ground. 4 wire ground. normally connected to system ground. 24 vcc positive power supply. +5v dc 25 vrly relay supply voltage. typically +5v. connects to the relay supply voltage. xlb xlc ic tip ring ic ic ic ic rv fl rl ic ic xld xla lrd vrly vcc agnd vee lrc shk ic rx tx ic ic 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
preliminary information MH88636-4 2-289 functional description the MH88636-4 is a central of?ce interface circuit (coic). it is used to correctly terminate a central of?ce 2-wire telephone line. the device provides a signalling link and a 2-4 wire line interface between the telephone line and subscriber equipment. the subscriber equipment can include private branch exchanges (pbx's), key telephone systems, terminal equipment, digital loop carriers and wireless local loops. all descriptions assume that the device is connected as in the application circuit shown in figure 3. isolation barrier the MH88636-4 provides an isolation barrier which is designed to meet fcc part 68 (november 1987) leakage current requirements. external protection circuit an external protection circuit assists in preventing damage to the device and the subscriber equipment, due to over-voltage conditions. the type of protection required is dependant upon the application and regulatorary standards. in figure 3 the protection is shown in block form. further details should be obtained from the speci?c countrys regulatorary body. suitable markets the MH88636-4 has a selectable input impedance of 900 w or 900 w + 2.16 m f. this makes it suitable primarily for north america or brazilian markets. line termination when lrc is at a logic 1, lrd will sink current which energizes the loop relay (k1), connecting xla to xlb and xlc to xld. this places a line termination across tip and ring. the device can be considered to be in an off-hook state and dc loop current will ?ow. the line termination consists of a dc resistance and an ac impedance. when lrc is at a logic 0, the line termination is removed from across tip and ring. an external dummy ringer should be permanently connected across tip and ring and under these conditions is the only load on the line. the device can be considered to be in an on-hook state and negligible dc current will ?ow. the dummy ringer is a series ac load of typically (17k w +330nf) which represents a mechanical telephone ringer and allows ringing voltages to be sensed. this load can be considered negligible when the line has been terminated. depending on the network protocol being used the line termination can seize the line for an outgoing call, terminate an incoming call, or if applied and disconnected at the correct rate can be used to generate dial pulse signals. the dc line termination circuitry provides the line with an active dc load which is equivalent to a dc resistance of less than 300 w, dependant upon the loop current. ringing equivalent number the ringing equivalent number (ren) is application speci?c. see the governing regulatory body speci?cation for details. ac input impedance the input impedance (zin) is the ac impedance that the MH88636-4 places across tip and ring in order to terminate the telephone line. it can be set to either 900 w or 900 w + 2.16uf by connecting an external impedance between xla and xld (zext). to select a 900 w input impedance, 1000 w must be connected across xla and xld. 26 lrd loop relay drive (output). connects to the loop relay coil. when lrc is at a logic 1 an open collector output at lrd sinks current and energizes the relay. 27 xla loop relay contact a. connects to xlb through the loop relay (k1) contacts when the relay is activated. 28 xld loop relay contact d. connects to xlc through the loop relay (k1) contacts when the relay is activated. pin description (continued)
MH88636-4 preliminary information 2-290 to select a 900 w + 2.16 m f input impedance, 1000 w + 360 w //2.2uf must be connected across xla and xld. all connections should be kept as short as possible. network balance impedance the MH88636-4s network balance impedance has been optimised for either of the two input impedances. 2-4 wire conversion the device converts the balanced 2-wire input, presented by the line at tip and ring, to a ground referenced signal at tx. this circuit operates with or without loop current; signal reception with no loop current is required for on-hook reception enabling the detection of caller line identi?cation (cli) signals. conversely the device converts the ground referenced signal input at rx, to a balanced 2-wire signal across tip and ring. the 4-wire side (tx and rx) can be interfaced to a ?lter/codec, such as the mitel mt896x, for use in digital voice switched systems during full duplex transmission, the signal at tip and ring consists of both the signal from the device to the line and the signal from the line to the device. the signal input at rx, being sent to the line, must not appear at the output tx. in order to prevent this, the device has an internal cancellation circuit. the measure of attenuation is transhybrid loss (thl). transmit and receive gain the transmit gain of the device is the gain from the balanced signal across tip and ring to the ground referenced signal at tx. it is set at 0db. the receive gain of the device is the gain from the ground referenced signal at rx to the balanced signal across tip and ring. it is set at -2db. supervision features line status detection outputs the MH88636-4 supervisory circuitry provides the signalling status outputs which are monitored by the system controller. the supervisory circuitry is capable of detecting: ringing voltage; forward and reverse loop battery; forward and reverse loop current; and switch hook. ? ringing voltage detect output ( r v) the r v output provides a logic 0 when ringing voltage is detected across tip and ring. it toggles at the ringing frequency, typically going low 50ms after the ringing voltage is applied and remains low for 50 ms after ringing voltage is removed. ? forward loop and reverse loop detect outputs ( fl & rl) the fl output provides a logic 0 when either forward loop battery or forward loop current is detected, that is the ring pin voltage is negative with respect to tip pin voltage. the rl output provides a logic 0 when either reverse loop battery or reverse loop current is detected, that is the tip pin voltage is negative with respect to ring pin voltage. ? the switch hook detect (shk) the shk output is active if either forward loop or reverse loop current is detected, or if forward or reverse battery voltage is detected. control inputs the MH88636-4 accepts a control signal from the system controller at the loop relay control input (lrc). this energises the relay drive output loop relay drive ( lrd). the output is active low and has an internal clamp diode to vrly. the intended use of this relay driver is to add and remove the line termination from across tip and ring, as shown in figure 3. if this control input and the supervisory features are used as indicated in figure 3, loop-start signalling can be implemented. mechanical data see figure 9 and 10 for details of the mechanical speci?cation.
preliminary information MH88636-4 2-291 figure 3 - typical ls application circuit MH88636-4 analog out analog in ringing detect forward loop reverse loop switch hook -5v +5v k1 protection circuit tip ring loop relay control tip ring lrd vrly lrc xla xlb xlc xld vcc agnd vee shk rl fl r v rx tx k1 notes: 1) k1 electro mechanical 2 form a k1 dummy 2) dummy ringer is typically 17k w + 330nf zext ringer c1 c2 3) c1 and c2 are decoupling capacitors 1 27 13 12 2 20 28 23 22 14 21 26 5 25 18 17 24 4 +5v
MH88636-4 preliminary information 2-292 * exceeding these values may cause permanent damage. functional operation under these conditions is not implied. ? typical ?gures are at 25?c with nominally 5v supplies and are for design use only. ? electrical characteristics are over recommended operating conditions unless otherwise stated. ? typical ?gures are at 25?c with nominally 5v supplies and are for design use only. absolute maximum ratings* parameters sym min max units comments 1 dc supply voltages v cc v ee -0.3 0.3 7 -7 v 2 dc ring relay voltage v rly -0.3 18 v 3 storage temperature t s -55 +125 ?c 4 ringing voltage v ring 130 vrms 5 ring trip current i tr 180 marms 250ms 10% duty cycle or 500ms single shot recommended operating conditions parameters symbol min typ ? max units comments 1 dc supply voltages v cc v ee 4.75 -4.75 5.0 -5.0 5.25 -5.25 v v 2 dc ring relay voltage v rly 5.0 15 v 3 operating temperature t op -40 25 85 ?c industrial range mh88636ad-4i 0 25 70 ?c commercial range mh88636a*-4 dc electrical characteristics ? characteristics sym min typ ? max units test conditions 1 supply current i cc i ee 4 3 13 13 ma ma 2 power consumption pc 35 137 mw 3 fl rl shk r v low level output voltage high level output voltage v ol v oh -0.3 2.4 0.5 5.25 v v i ol = 4ma i oh = 0.4ma 4 lrd sink current, relay to v cc clamp diode current i ol i cd 100 150 ma ma v ol = 0.35v 5 lrc low level input voltage high level input voltage v il v ih 2.0 0.8 v v 6 lrc high level input current low level input current i ih i il 40 40 m a m a v ih = 5.0v
preliminary information MH88636-4 2-293 ? electrical characteristics are over recommended operating conditions unless otherwise stated . ? typical ?gures are at 25 c with nominal 5v supplies and are for design aid only. loop electrical characteristics ? characteristics symbol min typ ? max units test conditions 1 ringing voltage rv 20 110 v rms 2 ringing frequency 16 68 hz 3 operating loop current 16 70 ma 4 off-hook dc resistance 260 300 320 w @ 20ma @ 16ma 5 leakage current (tip-ring to agnd) 7 marms @ 1000vac 6 shk & fl threshold tip-ring (on-hook) tip-ring current (off-hook) 14 5 20 15 vdc ma lrc = 0v lrc= 5v 7 shk & rl threshold tip-ring (on-hook) tip-ring current (off-hook) -14 -5 -20 -15 vdc ma lrc= 0v lrc = 5v
MH88636-4 preliminary information 2-294 ? electrical characteristics are over recommended operating conditions unless otherwise stated . ? typical ?gures are at 25 c with nominal 5v supplies and are for design aid only. ac electrical characteristics ? characteristics symbol min typ ? max units test conditions 1 2-wire input impedance zin 900 w programmed with z ext =1k w 2 return loss at 2-wire rl 20 30 db test circuit as fig 6 200-3400 hz zin = 900 w 3 longitudinal to metallic balance 58 58 53 51 db db db db test circuit as fig 7 200hz 1000hz 2000hz 3000hz-4000hz 4 metallic to longitudinal balance 60 40 db db test circuit as fig 8 200hz - 1khz 1khz - 4khz 5 transhybrid loss thl 20 db 200-4000hz 6 gain (voltage) 2 wire to tx relative gains -0.25 -0.15 -0.25 0 0 0 +0.25 +0.15 +0.15 db db db test circuit as fig 4 1000hz 300hz 3400hz 7 gain (voltage) rx to 2 wire relative gains -2.25 -0.15 -0.25 -2 0 0 -1.75 +0.15 +0.15 db db db test circuit as fig 5 1000hz 300hz 3400hz 8 input impedance at rx 10 k w 9 output impedance at tx 5 w 10 signal overload level at 2-wire at tx 3.0 0 dbm dbm % thd < 5% ref 900 w @ 20ma 11 total harmonic distortion at 2-wire at tx thd 0.1 0.1 1.0 1.0 % % input 0.5v, 1khz @ rx input 0.5v, 1khz @ tip-ring 12 idle channel noise at 2-wire at tx nc 11 13 16 16 dbrnc dbrnc 13 power supply rejection ratio at 2-wire and tx v cc v ee psrr 25 25 db db ripple 0.1v, 1khz 14 cmrr 50 40 db db test circuit as fig 7 50hz - 200hz 200hz - 4khz 15 on-hook gain, 2-wire to tx relative to off-hook gain -1 0 1 db input 1000hz @ 0.5v
preliminary information MH88636-4 2-295 figure 4 - 2-4 wire gain test circuit figure 5 - 4-2 wire gain test circuit ~ 100uf -v ring tip xla xlb xlc xld vs = 0.5v 600 w agnd vcc vee rx tx 100uf +5v -5v i = 25ma 10h 300 w 10h 300 w + + gain = 20 * log (vtx/vs) 17k w 330nf ~ vs = 0.5v z = 600 w gain = 20 * log (vz/vs) 100uf -v ring tip xla xlb xlc xld agnd vcc vee rx tx 100uf +5v -5v i = 25ma 10h 300 w 10h 300 w + + 17k w 330nf
MH88636-4 preliminary information 2-296 figure 6 - return loss test circuit figure 7 - longitudinal to metallic balance and cmrr test circuit 600 w 368 w v1 return loss = 20 * log (v1\vs) ~ 100uf -v ring tip xla xlb xlc xld vs = 0.5v agnd vcc vee rx tx 100uf +5v -5v i = 25ma 10h 300 w 10h 300 w + + 368 w 17k w 330nf 368 w v1 long to met bal. = 20 * log (v1\vs) ~ 100uf -v ring tip xla xlb xlc xld agnd vcc vee rx tx 100uf +5v -5v i = 25ma 10h 300 w 10h 300 w + + 368 w cmrr = 20 * log (vtx\vs) - (2-4w gain) 17k w 330nf vs = 0.5v
preliminary information MH88636-4 2-297 figure 8 - metallic to longitudinal balance test circuit figure 9 - dil package mechanical data 368 w v1 met to long bal. = 20 * log (v1\vs) ~ 100uf -v ring tip xla xlb xlc xld vs = 0.5v agnd vcc vee rx tx 100uf +5v -5v i = 25ma 10h 300 w 10h 300 w + + 368 w 510 w 17k w 330nf 1.42 max (36.1 max) 0.05 typ (1.27 typ) 0.020 +0.005 (0.5 +0.12) 0.260 +0.015 (22.9 typ) 0.95 max (24.2 max) 0.90 typ 0.26 max (6.6 max) 0.08 typ (2 typ) 0.100 +0.010 (2.54 +0.25) * * 1 * (6.6 +0.4) notes: 1) not to scale 2) dimensions in inches. (dimensions in millimetres) * dimensions to centre of pin. 3) pin tolerances are non-accumulative. 4) recommended soldering conditions: max wave solkder temp: 260?c for 10 secs.
MH88636-4 preliminary information 2-298 figure 10 - smt package mechanical data figure 11 - smt footprint notes: 1) not to scale 2) dimensions in inches. (dimensions in millimetres) 1.42 max * dimensions to centre of pin. 1 3) pin tolerances are non-accumulative. 4) recommended soldering conditions: (22.6 typ) 0.060 typ (1.52 typ) 0.89 typ 0.125 +0.015 (3.18 +0.38) 0.32 max (8.13 max) 0.100 +0.010 (2.54 +0.25) * 0.020 +0.005 (0.51 +0.13) 0.05 typ (1.27 typ) * max reflow temp: 235?c for 10 secs. 1.01 typ (29.5 max) (36.1 max) 0.10 (2.54) 0.89 (22.6) 0.04 (1.02) 0.06 (1.52) 0.10 (2.54) notes: 1) not to scale 2) dimensions in inches. (dimensions in millimetres) 3) all dimensions are typical
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 MH88636-4

	To Download MH88636-4 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .