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1 features ? fully programmable line impedance,network balance impedance and gains ? programmable loop current with long loop capability ? 2-4 wire conversion ? power down and wake up ? battery feed to line with wide operating range ? off-hook and dial pulse detection ? over-current protection ? integral ringing amplifier with auto ring trip ? tip/ring reversal ? meter pulse injection ? on-hook transmission to the line capability ? relay driver ? short loop ringing capability with low voltage dc supply applications line interface for: ? pabx/key telephone system ? analog terminal adaptors ? pair gain system ? fibre in the loop/wireless local loop description the zarlink MH88617 is a highly featured, low cost subscriber line interface circuit (slic). it provides a total analog transmission and signalling link between a codec and a subscriber line. all functions are integrated into a single thick film hybrid module, which provides high reliability and optimum circuit design needing a minimum of external components. the line impedance, network balance impedance, gain and loop current are all externally programmable, making the device suitable for a wide range of applications worldwide. figure 1 - functional block diagram tip ring gvx vbat vcc vee gnd lca ringing control and amplifier lr power management constant current control reversal supervision auto ring trip tip / ring drive and sense vx vr za rdi rdo ese esi shk dcri rv rc 2 - 4 wire conversion gain adjust programmable impedance metering injection relay driver & programmable network balance ds5037 issue 5 october 2001 ordering information MH88617av-pi 21pin sil package -4 0 c to 85 c MH88617 programmable slic with ringing amplification advance information
MH88617 advance information 2 figure 2 - pin connections pin description 28 pin dil 21 pin sil name description 26 1 dcri dc ringing voltage input. a continuous dc voltage is applied to this pin. this voltage is the positive supply rail for the internal ringing amplifier. 16 2 rdi relay driver input. relay driver control pin. 15 3 rdo relay driver output. open collector relay driver output. 5 4 lr line reversal. setting this pin to a logic 0 will perform a line reversal. this pin must be connected to logic 1 for normal operation. 1 5 tip tip lead. connects to the "tip" lead of the subscriber line. 3 6 ring ring lead. connects to the "ring" lead of the subscriber line. 12 7 vbat battery voltage. battery supply for the subscriber line. typically -48v dc is applied to this pin. 9 8 lca loop current adjust. the loop current is programmed by connecting a resistor between this pin and the vcc or agnd pins. leaving this pin open circuit defaults the loop current to 24ma. setting this pin to 0v will apply power down. 28 9 vx transmit signal (output). 4-wire analog signal from the slic. 27 10 gvx transmit gain adjust. the transmit gain can be programmed by connecting a resistor between this pin and vx. the network balance impedance can also be programmed by connecting external matching components from this pin to vr. 17 11 vr receive signal (input). 4-wire analog signal to the slic. 22 12 vcc positive supply voltage. +5v. 21 13 agnd analog ground. ground path for the subscriber line and all dc power supplies, normally connected to system ground. 20 14 vee negative supply voltage. -5v. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 dcri rdi rdo lr tip ring vbat lca vx gvx vr vcc agnd vee rv ese esi ic shk rc za 21 pin sil 28 pin dil 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 tip ic ring ic lr rc ese esi lca ic ic vbat ic shk vx gvx dcri ic ic ic vcc agnd vee rdo rdi vr rv za
advance information MH88617 3 18 15 rv ringing voltage. a low level ac sinusoid is applied to this pin. this signal is amplified and output from tip/ring to the line as the ringing signal, when rc is at logic 1. this pin should be driven with a low impedance agnd centred source . 7 16 ese external signal enable. meter pulse input enable. 8 17 esi external signal input. meter pulse input. 2, 4,10 11,13 ,23 25,24 18 ic internal connection. no connection should be made to this pin. 14 19 shk switch hook detect (output). a logic 1 at this pin indicates when the subscriber has gone off-hook. 6 20 rc ringing control (input). a logic 1 will cause the ringing voltage to be applied to the line. 19 21 za line impedance. connect passive components from za to ground to match input and line impedance. pin description (continued) 28 pin dil 21 pin sil name description functional description the MH88617 is a subscriber line interface circuit (slic) used to provide an analog interface between the 4-wire connection and the 2-wire subscriber line of a communications system. it provides powering of the subscriber line along with signalling, control and status circuits. this combines to provide a comprehensive line and interface solution in applications such as pabx, key systems, analog terminal adapters, pair gain systems, fibre in the loop and wireless local loop. external protection circuit an external protection circuit assists in preventing damage to the device and the subscriber equipment, due to over-voltage conditions (see figure 3). also reference msan-156. 2-4 wire conversion the slic converts the balanced 2-wire input at tip and ring to a ground referenced signal at vx. the device converts the ground referenced signal input at vr to a balanced 2-wire signal across tip and ring. normally the vx and vr pins connect to a codec that interfaces the analog signal to a digital network.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 vr being sent to the line, must not appear at the output vx. in order to prevent this, the device has an internal cancellation circuit, the measure of this attenuation is transhybrid loss (thl). the MH88617 has the ability to transmit analog signals from vr through to tip and ring when on- hook. this can be used when sending caller line identification information. battery feed and loop current adjust the MH88617 has an active feedback circuit to regulate the dc current to the subscriber line. this current is programmable over a wide range via the lca pin. with lca open circuit the current will be set to 24ma. this can be increased up to 55ma by connecting a resistor between lca and vcc or reduced down to 14ma by connecting a resistor between lca and agnd. msan-156 shows a table of resistor values and loop current. the line driver stage is biased between +5v and -48v dc. therefore it should be noted that loop current will flow in the +5v supply, this must be taken into consideration when choosing the +5v supply. the device will operate over a very wide vbat supply range but care must be taken when programming the constant current that the maximum
MH88617 advance information 4 power dissipation is not exceeded. for the majority of applications this will not be a problem, however the device could be damaged if used to drive a very short line with the maximum battery voltage and maximum programmable loop current. for very long loops the constant current drive reverts to a constant voltage source. a graph of loop current versus line resistance is shown in figure 4. under fault conditions, tip or ring are protected from short circuits to ground when the current exceeds the protection trip threshold. under these circumstances, the slic will go into a power down mode and periodically check the line status until the fault has been removed. thereby minimizing power dissipation. the slic will revert to an operational state once the fault is removed. ringing amplification the MH88617 incorporates an internal ringing amplifier circuit. a balanced ringing signal is applied across tip and ring, when a dc voltage is connected to the dcri pin, a low level sinusoidal signal is applied to rv and rc is set to logic 1. the ringing voltage is approximately 50 times the signal at rv. the gain depends on the ringer load and impedance at za. if an absolute gain is required, a transistor can be fitted across za to give 42. the slic also has the ability to provide ringing on short loops without the need for a high voltage dcri supply. this is achieved by connecting the dcri pin to a low voltage supply such as +5v or +12v providing the subscriber equipment ringing detector has a low enough sensitivity threshold. in this application the input at rv needs to be a square wave (refer msan-156) . the slic has an automatic ring-trip circuit that ensures the ringing is removed when the subscriber goes off-hook. however the user must still insure rc is taken to logic 0 when shk signals the subscriber has gone off-hook. programmable input impedance by connecting external passive components between za and ground (agnd) the device?s input impedance can be set to match the line impedance. as shown in figure 3 and table 1. a more comprehensive list is given in msan-156. programmable network balance the network balance of the device can be programmed by connecting external passive components between gvx and vr, as shown in figure 3 and table 1. figure 3 - typical application circuit tip ring vx vr agnd vcc tip ring +5v MH88617 protection circuit notes: za z1 vee vbat dcri -5v -48v rv lr gvx sd3 sd2 sd1 sd0 rdi ese rc vx vr mt896x esi shk rdo shk relay drive output lca loop current adjust input 1.0vrms sinewave (16-68hz) 1.0vrms sinewave (12/16khz) 1) for resistor and impedance values 0-100v dsto dsti clk f1i ca +5v 10k c1 c2 2) c1 and c2 are 100nf decoupling capacitors r2 z2 r1 see table 1 t e.g teccor p2353ab f1 f2 3) f1 and f2 slow blow fuses
advance information MH88617 5 table 1 gives table of values for some common applications. a more comprehensive list is given in msan-156. programmable transmit and receive gain the transmit gain from tip and ring to vx can be programmed by connecting a resistor between gvx and vx. similarly the receive gain from vr to tip and ring can be programmed by connecting an impedance in series with vr as shown in figure 3 and table 1. refer to msan-156 for additional impedances. off-hook and dial pulse detection the switch hook detect output (shk) goes to a logic 1, when loop current is above the detect threshold (see dc electrical characteristics). this occurs when the subscriber?s equipment seizes the line to initiate a call or answer a call. when loop disconnect dialling is being used, shk pulses to logic 0 to indicate the digits being dialled. this output should be debounced by the system software. during on-hook transmission shk remains at logic 0. reversal during normal operation i.e. lr connected to logic 1, the dc voltage on tip is positive with respect to ring. this can be reversed by applying a logic 0 to the line reversal pin ( lr ). this feature is used for signalling. the slic is functional during reversal but for optimum performance forward operation is recommended. meter-pulse injection if the external signal enable (ese) is taken to logic 1 and a 12khz or 16khz meter pulse signal is applied to the esi pin then this signal will be amplified and output across tip and ring. this is used for calculating the cost of a telephone call. the gain of the meter pulse signal varies with programmed input impedance e.g. with the input impedance programmed for 600 w and a 200 w ac load applied across tip and ring the esi signal will be amplified by a factor of 2. some applications require the 12/16 khz meter pulse signal to be ramped before being input at esi. power down if agnd is applied to lca pin the MH88617 will enter a power down mode where the internal circuitry is turned off and the power consumption is reduced. this can be used to conserve power when the line is inactive. if the system wants to initiate a call the agnd must be removed from the lca before the ringing signal is transmitted. if the subscriber initiates a call by seizing the line, shk will go to logic 1. the system should monitor this and respond by removing the agnd from lca causing the device to wake up. figure 4 - loop current vs. line resistance 24ma 0 w ? 1800 w r loop i loop vbat @ -48v lca o/c constant current constant voltage ? 2800 w 14ma
MH88617 advance information 6 relay driver an open collector output is provided as a driver for an external relay. applying 5v to the rdi pin will cause the rdo pin to sink current to ground. a flyback diode must be connected across the relay coil to protect this output. the dc load of the relay coil must not exceed 20 w. mechanical data see figure 11, 12, 13, and 14 for details of the mechanical specification. table 1 - external programming components note: the programming component values shown, give the optimum performance in terms of gain accuracy, return loss and thl. a compromise is these values can be made if a reduction in performance is acceptable. line conditions programming components line impedance balance impedance vx gain vr gain z1 z2 r1 r2 600 w 600 w 0db 0db 30k 18k + 18k t 470pf 36k 110k 600 w 600 w 4db -4db 30k 28k5 + 28k5 t 330pf 57k 180k 600 w 350 w +1k w //210nf 0db 0db 60k//30k 18k + 18k t (10k3+5.3nf) 36k 110k 370 w +620 w / /310nf 370 w +620 w //310nf 0db 0db 40k//(1.2nf+ 32k5) 18k + 18k t 100pf 36k (124k//1.5nf) + 64k 220 w +820 w / /115nf 220 w +820 w //115nf 0db 0db 41k//(630pf+3k) 36k 36k (164k//550pf) + 34k 900 w 900 w 0db 0db 38k9 18k+18k t 330pf 36k 174k 270 w +750 w / /150nf 270 w +750 w //150nf 0db 0db 40k3//(11k5+730pf) 18k+18k t 100pf 36k (150k//760pf) + 48k5
advance information MH88617 7 *exceeding these values may cause permanent damage. functional operation under these conditions is not implied. . ? typical figures are at 25c with nominal supply voltages and are for design aid only note 1: applies to a sinusoidal input. rv can also be driven with a ttl signal (ac coupled) see msan-156. absolute maximum ratings* - all voltages are with respect to agnd unless otherwise specified. parameter sym min max units 1 dc supply voltage v cc v ee -0.3 -6 6 0.3 v v 2 dc battery voltage v bat -75 0.3 v 3 dc ringing voltage v dcri -0.7 150 v 4 dc reference voltage lca -0.3 6 v 5 relay driver voltage rdo -0.3 15 v 6 relay driver coil resistance 230 w (for 5v relay) 7 ringing input voltage rv 0 3 vrms note 1 8 maximum power handling capacity (off-hook) @ 25c @ 70c @ 85c pd 2250 1530 1290 mw mw mw 9 storage temperature t s -55 +125 c recommended operating conditions parameter sym min typ ? max units test conditions 1 dc supply voltages v cc v ee 4.75 -5.25 5.0 -5.0 5.25 -4.75 v v 2 dc battery voltage v bat -72 -48 -20 v 3 dc ringing voltage v dcri 5 110 v 4 ringing input voltage rv 2.5 vrms note 1 5 ringing output power pr 2250 mw @ 25c 6 operating temperatures t op -40 25 85 c
MH88617 advance information 8 ? electrical characteristics are over recommended operating conditions unless otherwise stated. ?typical figures are at 25 c with nominal supply voltages and are for design aid only. note: figure quoted is the +5v supply current plus loop current which flows between -48v (battery supply) and the +5v supply. dc electrical characteristics ? characteristics sym min typ ? max units test conditions 1 supply current i cc i cc i ee i bat i dcri i dcri 12 i loop + 12 -12 -3 100 100 ma ma ma ma m a ma test circuit as fig 7 on-hook off-hook note on-hook on-hook rc at logic 0 rc at logic 1 2 power consumption pc 40 270 80 mw mw power down, on-hook = -48v idle 3 constant current feed to line i loop 24 ma lca o/c, v bat = -48v r loop = 300 w, v cc = 5v 4 adjustable loop current range i loop 14 55 ma 5 maximum operating loop resistance r loop 2000 w i loop = 18ma, v bat = -48v includes telephone set 6 tip or ring to gnd, over- current protection 100 ma v bat = -48v 7 low level output voltage high level output voltage v ol v oh 2.4 0.4 v v i ol = 4ma i oh = 0.4ma 8 relay driver current sink capability 20 ma for sv relay 9 low level input voltage high level input voltage low level input current high level input current v il v ih i il i ih 5.0 0.1 0.5 0.8 v v ma ma 10 switch hook detect threshold 4 8.5 13 ma v bat = -48v
advance information MH88617 9 ac electrical characteristics ? characteristics sym min typ ? max units test conditions 1 ringing drive capability 5 ren 5 ren=1400 w @ 20hz r loop = 1800 w v@load=35v rms (@25c) dcri=100vdc v bat =-48v 2 ac ringing amplifier gain (note 5) output voltage (note 3) frequency range a ring v ring f ring 16 50 60 68 vrms hz v bat = -48v dc v dcri = 100v dc rv = 1.2vrms sinewave, ren 5 3 auto ring trip & shk detect time ring trip shk 200 40 ms ms test circuit as fig 5 rv = 16hz, rc = 1 rc at logic 0 4 input impedance at vr 10 k w 5 output impedance at vx 10 w 6 receive gain (vr to 2-wire) off-hook programmable range on-hook (relative to off-hook) -0.2 -12 0 6 0.2 6 db db db test circuit as fig 7 input 0.5v at 1khz t-r load > 10k w, output<2.25v @ 1khz 7 frequency response gain (relative to gain @ 1khz) -0.25 0 0.25 db test circuit as fig 7 300 - 3400hz 8 transmit gain (2-wire to vx) programmable range -0.2 -12 0 0.2 6 db test circuit as fig 6 input 0.5v @ 1khz 9 frequency response gain (relative to gain @ 1khz) -0.25 0 0.25 db test circuit as fig 6 300 - 3400hz 10 total harmonic distortion at vx and 2-wire. thd 1 % test circuits as fig 6&7 output 0dbm @ 1khz 11 overload at vx and 2-wire. 5 % test circuits as fig 6&7 output +3dbm @ 1khz 12 common mode rejection ratio cmrr 48 db test circuit as fig. 9 200 - 3400hz 13 idle channel noise at vx nc 12 dbrnc test circuit as fig. 7 input 0v 14 idle channel noise at 2-wire nc 12 dbrnc test circuit as fig. 7 input 0v 15 power supply rejection ratio at vx and 2-wire vx 2-wire psrr 25 25 db db test circuit as fig. 7 ripple 0.1vrms 1khz @ v cc / v ee / v bat / v dcri 16 transhybrid loss thl 18 21 db test circuit as fig 7 300 - 3400hz 500 - 2500hz 17 return loss at 2-wire rl 18 db test circuit as fig 8 300 - 3400hz
MH88617 advance information 10 ? electrical characteristics are over recommended operating conditions unless otherwise stated. ?typical figures are at 25 c with nominal power supplies unless otherwise stated and are for design aid only. test conditions shown in figures 7-12 are programmed for 600 w . note 1: all of the above test conditions use a test source impedance which matches the device?s impedance. note 2: dbm is referenced to 600 w unless otherwise stated . note 3: the typical output voltage from the ringing amplifier assumes the output is unloaded. note 4: the test shown is for 600r impedance for other impedance use the programming components as shown in table 1. note 5: the gain will change depending on the programming components at za. for amplifier gain msan156 describes a circuit where the gain can be guaranteed to be 42. 18 longitudinal to metallic balance 55 48 60 53 db db test circuit as fig. 9 200-1000hz 1000-3400hz test circuit as fig. 10 19 meter pulse output level (note 5) eso 1.75 2 2.25 vrms za= 30k (600r config) t-r ac load = 200 w , esi = 1vrms 20 audio settling time after reversal 50 ms ac electrical characteristics ? characteristics sym min typ ? max units test conditions
advance information MH88617 11 figure 5 - dc condition test figure 6 - 2-4 gain wire test circuit vbat vcc vee dcri vr vx shk tip ring rv rc lr gnd ese z1 esi rdo 100 w rdi 1k za 1k +5v +5v -5v +90v -48v dut lca sw1 1 2 3 10uf 1.6k i ringing source 1.2vrms z2 gvx z1 = 30k w z2 = 18k + 18k t 470pf 20hz r1 r2 300r r2 = 110k r1 = 36k vs i=24ma 100uf + 100uf + 4-2 wire gain = 20 * log (vx / vs) impedance = 600 w vr vx shk tip ring rv rc lr gnd ese z1 esi rdo 100 w rdi 1k 1k +5v +5v -5v -48v dut lca ringing source 10h 1k w vbat vcc vee dcri za +90v 1.2vrms r1 z2 r2 gvx z1 = 30k w z2 = 18k + 18k t 470pf r2 = 110k r1 = 36k
MH88617 advance information 12 figure 7 - 4-2 wire gain test circuit figure 8 - return loss zin (600 w) gain = 20 * log (v(zin) / vs) vs i=24ma 100uf + 100uf + vr shk tip ring rv rc lr gnd ese z1 esi rdo 100 w rdi 1k 1k +5v +5v -5v -48v dut lca ringing source 10h 1k w vbat vcc vee dcri za +90v 1.2vrms z2 z1 = 30k w z2 = 18k + 18k t 470pf gvx vx 20hz r1 r2 r2 = 110k r1 = 36k v1 300 w 300 w vs return loss = 20 * log (2v1/vs) zin i=24ma 100uf + 100uf + vr shk tip ring rv rc lr gnd ese z1 esi rdo 100 w rdi 1k 1k +5v +5v -5v -48v dut lca ringing source 10h 1k w vbat vcc vee dcri za +90v 1.2vrms z2 r2 gvx vx 20hz r1 z1 = 30k w z2 = 18k + 18k t 470pf r2 = 110k r1 = 36k
advance information MH88617 13 figure 9 - longitudinal to metallic balance & cmrr test circuit figure 10 - mechanical data for 21 pin sil hybrid vs 300 w 300 w long. to met. balance = 20 * log (v1 / vs) v1 i=24ma 100uf + 100uf + vr shk tip ring rv rc lr gnd ese z1 esi rdo 100 w rdi 1k 1k +5v +5v -5v -48v dut lca ringing source 10h 1k w 1.2vrms cmrr = 20 * log (v2/vs) z2 r2 z1 = 30k w z2 = 18k + 18k t 470pf vbat vcc vee dcri gvx za +90v vx 20hz r1 v2 r2 = 110k r1 = 36k 1 0.75 + 0.02 0.020 + 0.005 (0.5 + 0.13) 0.100 + 0.010 (1.3 + 0.25) 0.05 + 0.01 0.180 + 0.020 (4.57 + 0.51) (2.54 + 0.25) * * 0.14 max (3.5 max) 0.010 + 0.002 (0.25 + 0.05) 0.1 max (2.5 max) 2.120 max (53.85 max) 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: wave soldering max. temp: 260 c for 10 secs. (19.0 + 0.51)
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MH88617AV-PI	Zarlink Semiconductor Inc	INSTOCK		64
MH88617AV-PI	Zarlink Semiconductor Inc	INSTOCK		4

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