obsolescence notice this product is obsolete.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 - 1 2 1 f e a t u r e s i n p u t i m p e d a n c e 6 0 0 w t r a n s f o r m e r l e s s 2 - w i r e t o 4 - w i r e c o n v e r s i o n b a t t e r y a n d r i n g i n g f e e d t o l i n e o f f - h o o k a n d d i a l p u l s e d e t e c t i o n r i n g g r o u n d o v e r - c u r r e n t p r o t e c t i o n a d j u s t a b l e c o n s t a n t c u r r e n t f e e d r e l a y d r i v e o u t p u t w i t h d i o d e p r o t e c t i o n p o w e r d e n i a l w i d e v b a t o p e r a t i n g r a n g e t i p / r i n g r e v e r s a l a p p l i c a t i o n s l i n e i n t e r f a c e f o r : p a b x i n t e r c o m s k e y t e l e p h o n e s y s t e m s c o n t r o l s y s t e m s f i g u r e 1 - f u n c t i o n a l b l o c k d i a g r a m v b a t v d d v e e g n d a v r v x v r e f c a p s h k r d 1 r c 1 v r l y r c 2 r f r i n g t i p t f r e l a y d r i v e c i r c u i t o v e r c u r r e n t p r o t e c t i o n 2 - w i r e t o 4 - w i r e c o n v e r s i o n l o o p s u p e r v i s i o n c u r r e n t c o n s t a n t f e e d p o w e r d e n i a l b a t t e r y f e e d t / r r e v e r s e t / r r e v e r s e r e l a y d r i v e r p d l p g n d r v o r d e r i n g i n f o r m a t i o n m h 8 8 6 1 2 k 3 0 p i n s i l p a c k a g e 0 c t o 7 0 c d e s c r i p t i o n t h e s l i c p r o v i d e s a c o m p l e t e i n t e r f a c e b e t w e e n a s w i t c h i n g s y s t e m a n d s u b s c r i b e r l o o p . f u n c t i o n s p r o v i d e d i n c l u d e b a t t e r y f e e d , r i n g i n g f e e d a n d t i p - r i n g r e v e r s a l t o t h e s u b s c r i b e r l i n e , 2 - w i r e t o 4 - w i r e h y b r i d i n t e r f a c i n g , c o n s t a n t c u r r e n t f e e d a n d d i a l p u l s e d e t e c t i o n . t h e d e v i c e i s f a b r i c a t e d a s a t h i c k l m h y b r i d u s i n g v a r i o u s t e c h n o l o g i e s . d s 5 0 6 6 i s s u e 3 a p r i l 1 9 9 5 m h 8 8 6 1 2 k s u b s c r i b e r l i n e i n t e r f a c e c i r c u i t p r e l i m i n a r y i n f o r m a t i o n
2-122 MH88612K preliminary information figure 2 - pin connections pin description pin # name description 1tf tip feed. connects to external diode for protection. internally connected to pin 21. 2rf ring feed (input) . is normally connected to ring relay for negative battery feed voltage and ringing voltage input. 3 ic/nc no connections to be made to this pin, used for internal connection. 4 ic/nc no connections to be made to this pin, used for internal connection. 5 ic/nc no connections to be made to this pin, used for internal connection. 6 ic/nc no connections to be made to this pin, used for internal connection. 7 ic/nc no connections to be made to this pin, used for internal connection. 8 tip connects to the tip lead of the telephone line. 9 ic/nc no connections to be made to this pin, used for internal connection. 10 ring connects to the ring lead of the telephone line. 11 rc2 relay control 2 (input ). active high to reverse tip/ring. 12 lpgnd loop ground is the system ground reference with respect to v bat . normally tied with gnda. 13 ic/nc no connections to be made to this pin, used for internal connection. 14 vr voice receive (input) is the 4-wire analog signal to the slic . 15 vref voltage reference (input). to set the constant current feed to the subscriber line. constant current feed can be adjusted by the input voltage on the v ref . this pin can also be grounded for normal 25ma loop current. 16 cap connects external capacitor to ground for ring trip. 17 shk switch hook detect (output). active high 18 gnda analog ground (0v) 19 vee negative power supply voltage (-5v). 20 vdd positive power supply voltage (+5v). 21 tf tip feed . connect an external diode for protection. internally connected to pin 1. 22 vbat negative battery feed supply voltage (-48v). 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 tf rf ic ic ic ic ic tip ic ring rc2 lpgnd ic vr vref cap shk gnda vee vdd 20 21 22 23 24 25 26 27 28 29 30 tf vbat rv pd vx ic ic vrly rc1 rd1
2-123 preliminary information MH88612K 23 rv ring feed voltage connects to (rf) through a normally closed ring relay. 24 pd power denial (input). a logic high will isolate the battery voltage to tip/ring. 25 vx voice transmit (output). is the 4-wire analog signal from the slic. 26 ic/nc no connections to be made to this pin, used for internal connection. 27 ic/nc no connections to be made to this pin, used for internal connection. 28 vrly relay voltage supply (+5v). this pin is used to power the on board relay. 29 rc1 relay control 1 (input). active high. normally used for ringing. 30 rd1 open collector sinks current when rc1 is at logic high. pin description (continued) pin # name description functional description the slic performs a transformerless 2-wire to 4- wire conversion of the analog signal. the 2-wire circuit is the balanced line going to the subscriber loop, while the 4-wire circuit is the audio signal going to and from devices such as the voice codec or switching circuit. the slic also provides a switch hook (shk) status output which goes high when the telephone is set off-hook. constant current feed the slic employs a complex feedback circuit to supply a constant feed current to the line. this is done by sensing the sum of the voltages across the internal feed resistors and comparing it to an input reference voltage (v ref ) that determines the constant feed current. if v ref is externally grounded, the constant current is set at 25ma. for a constant current setting between 18ma and 30ma. v ref can be set between 8.75 vdc and -6.35 vdc. the relationship is de?ned by the equation: i loop = 25 - v ref ma ( 2 ma) 1.25 switch hook detection when the dc current exceeds an internal threshold level, the switch hook (shk) will go high. if the loop resistance is so high that v bat can no longer supply the required amount of loop current as determined by constant current supply circuit, the output of the switch hook (shk) will go low to indicate that the loop resistance is too high and the line is on hook. ringing and ring trip detection in figure 3 a ringing signal (e.g., 90 vrms +-48 vdc is applied to the line by disconnecting (rv) from (rf), and connecting the ringing voltage at (rf) by use of the relay k1. an internal clamp diode is provided between vrly and rd1. the slic can detect an off-hook condition during ringing but there is a large ac component which must be ?ltered out to give a true off-hook condition at shk. a 1.0 m f capacitor connected from (cap) to ground will provide adequate attenuation when ringing is applied. once an off-hook condition has been detected a logic high should be applied to (rc) which will activate the relay (k1) to disconnect the ringing voltage from (rf) and reconnect to (rv). at that time slic will revert to constant current feed operation. for applications requiring dial pulse detection the capacitor connection to ground should be controlled such that the capacitor is only connected during ringing. during off-hook conditions (closed loop), the capacitor should be switched out. this can be performed using a transistor, relay to system drive output of a codec. applying gnda to the ring trip filter control pin will switch in the ?lter, whilst removing gnda, (with the switch in a tristate condition), will switch out the ?lter. for applications using dtmf signalling, the capacitor can be permanently connected to ground. tip/ring reverse the MH88612K provides a tip/ring reversal relay driver. to activate the internal relay to reversal tip and ring apply a logic input to rc2. current limit the tip or ring may be accidentally shorted to ground. in such a case, current will only ?ow through the feed resistor. this high current will be sensed
2-124 MH88612K preliminary information and reduced by the current limit circuit to a lower value to protect the internal circuitry. receive gain the power denial function is a feature of the mh88612c which allows for powering down of the subscriber loop. a logic high input applied to the power denial pin effectively removes the battery voltage from the loop driver circuitry. the resulting i loop is negligible and power consumption is minimised. the power denial function is useful for disabling a loop which may have a ground fault. this pin should be held low when not in use. applications component list r1 = 1/4 w, + 10%, 200 w r2 = 1/4 w, + 5%, 470 w c1 = cap. elec., 1.0 m f, + 10%, 25v d1,d2,d3,d4 = diode rect., 200v, 1a, in4003 k1 = relay e/m, 5 or 6v, 1 form c decoupling capacitors (cap. cer 0.1 m f, 50% + 20%) should be added to v dd , v ee , v bat , v ref and v rly options rv1, rv2 = 160v vrms, 250v, 10j figure 3 - application circuit vr vx vref shk cap gnda vee vdd vbat rd1 rc2 rc1 ring tip tf rv rf vbat vbat c1 r1 rv1 rv2 k1 d1 d2 d3 d4 90 vrms superimposed on -48vdc + - -5v +5v -48v +5v MH88612K vrly pd tip ring k1 ring trip filter control r2
2-125 preliminary information MH88612K absolute maximum ratings* * exceeding these values may cause permanent damage. functional operation under these conditions is not implied. ? typical ?gures are at 25?c and are for design aid only. parameter symbol min max units 1 dc supply voltage v dd v ee v bat -0.3 +0.3 0.3 +15 -15 -60 v v v 2 storage temperature t stg -40 100 c 3 package power dissipation p d 2w recommended operating conditions characteristics sym min typ ? max units comments 1 operating supply voltage v dd 4.75 5.0 5.25 v v ee -4.75 -5.0 -5.25 v v ref 0 v adjustable v bat -27 -48 -60 v v rly 5v 2 operating temperatures t o 070?c
2-126 MH88612K preliminary information dc electrical characteristics* - voltages are with respect to gnda unless otherwise stated. * dc electrical characteristics are over recommended operating supply voltages. ? typical ?gures are at 25?c with nominal 5v supplies and are for design aid only. characteristics sym min typ ? max units test conditions 1 supply current v dd v ee v bat i dd i ee i bat 5.8 -2.6 500 ma ma m a pd = logic high 2 power consumption p c 210 1410 mw mw standby active 3 constant current line feed i loop 23 25 27 ma v ref = gnda, v bat = -48v 4 adjustable loop current range operating loop resistance i loop 18 30 ma adjustable with ext. v ref input, v bat = -48v 5 ring ground over-current r loop 1200 w v bat = -28v @ i loop = 18ma, r loop includes telephone set 6 protection off-hook detect 40 ma 7 output low voltage (on-hook) output high voltage (off-hook) off- hook detect v ol v oh 0 2.7 0.4 5.25 v v active high logic 8 output low current (on-hook) input high current. (off-hook) rc1,rc2, pd control inputs i ol i oh 8 -400 ma m a 9 input low volt. (no activation) input high volt. (activation) rc1, rc2, pd control inputs v il v ih 2.0 0.7 v v active high logic 10 input low current (no activation) input high current (activation) i il i ih -50 50 m a m a
2-127 preliminary information MH88612K ac electrical characteristics * typical ?gure are at 25 c and are for design aid only: not guaranteed and not subject to production testing. characteristics sym min typ* max units test conditions 1 ringing voltage v ring 40 17 80 110 25 v rms hz superimposed on v bat = -48v 2 ringer equivalence number ren 3 3 ring trip detect time 100 125 ms 4 input ac impedance 2-wire z in 600 w 5 input impedance at v r 100 k w 6 output impedance at vx 10 w 7 gain 2-wire to vx gain relative to gain @ 1khz -1.0 +0.1 db input 3 dbm, 1khz across tip and ring, 300-3400 8 gain vr to 2-wire gain relative to gain @ 1khz -1.0 +0.25 db db (input 1.0 v rms 1khz at v r z load = 600 w 300-3400 hz) 9 2-wire return loss over 300-3400hz 20 30 db input 0.5 v rms 1khz across tip and ring, z load = 600 w 10 transhybrid loss over 300-3400 hz thl 35 50 db input 0.5v v rms at vr z load = 600 w 11 longitudinal to metallic balance 50 55 db input 0.5 v rms 12 total harmonic distortion at vx at tip and ring thd 0.1 0.1 1.0 1.0 % % input 3dbm, 1 khz across tip and ring, input 1.0 v rms 1khz at v r 13 common mode rejection ratio 2-wire to vx cmrr 40 50 db input 0.5 vrms, 1khz 14 idle channel noise (at vx) nc 12 dbrnc c- message 15 power supply rejection ratio v dd v ee v bat psrr 30 30 30 35 40 60 db db db 1 v pp ripple, 1khz on v dd v ee , v bat , measure at vx and across tip and ring
2-128 MH88612K preliminary information figure 4 - mechanical data (76.2 + 0.5) 0.34 max (8.5 max) 0.010 + 0.002 (0.25 + 0.05) 0.020 max (0.5 max) side view * 0.05 + 0.02 (1.3 + 0.5) * 0.15 + 0.02 (3.81 + 0.5) 0.100 + 0.010 (2.54 + 0.26) 0.180 + 0.02 (4.6 + 0.5) 3.000 ?? + 0.020 0.527 +0.020 (13.4 + 0.5) notes: 1) not to scale 2) dimensions in inches). 3) (dimensions in millimetres). *dimensions to centre of pin & tolerance non accumulative.
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