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v1.0 dec 2006 data sheet silver t e l e c o m 1. features ? a highly featured low power slic in a 14 pin sil format. ? integral high efficiency dc/dc converter. single supply voltage: +3.3v to + 5 .0v. ? highly integrated with an on-board ringing generator. ? tip/ring polarity reversal. on-hook transmission for caller line id. ? suitable for fct applic ations. ? easy to use, with a mi nimum number of external component s. ? simplified protection in ?on-premise? applications. ? silver telecom ?design-in? assistance 2. description the silv er telecom AG1171 is a single subscriber line interface circuit (slic) in a 14 pin single in line (sil) format. t he combination of features and packa ging offers extremely efficient use of board area, saving signif icant system size and cost, mini mising time to market for telephony system s developers. the AG1171 has been designed to work with loop lengths of typi cally 1.0k m (470r including telephone). the AG1171 has integral dc/dc converter and ringing generation thus providing all the line powering requirement s from a single supply. the AG1171 requires a minimum of exter nal component s, making it ideal for low line count, s hort loop length applic ations, such as wll terminal (wll), fixed cellular terminals (fct), fixed wireless terminals (fwt) and internet telephony (voip). AG1171 +3.3v / +5.0v low pow e r ringing s l ic pb pb ? silver tele com 20 06
v1 .0 d e c 20 06 AG1171 data sheet +3.3v / + 5 .0v low pow e r ringing slic table of contents 1. features ........................................................................................................................... 1 2. description ....................................................................................................................... 1 table of contents ............................................................................................................. 2 table of figures ............................................................................................................... 2 3. AG1171 product selector ................................................................................................. 3 4. pin desc ription ................................................................................................................. 5 5. functional description ..................................................................................................... 6 5.1. line interfacing .......................................................................................................... 6 5.2. battery feed .............................................................................................................. 6 5.3. ringing ...................................................................................................................... 6 5.4. power down and synchronis a tion ............................................................................. 7 5.5. the 2-4 wire (hybrid) conversion ............................................................................. 8 5.6. transmit and receive gain ....................................................................................... 8 5.7. the 2 wire impedance .............................................................................................. 8 5.8. network balance impedance .................................................................................... 8 5.9. tip & ring polarity reversal ..................................................................................... 8 5.10. on h ook transmission ............................................................................................ 8 5.11. switch hook detection ............................................................................................ 9 6. protection of the AG1171 slic ...................................................................................... 10 6.1. thermal protection .................................................................................................. 10 6.2. lightning and power cross protection .................................................................... 10 7. typical application ......................................................................................................... 10 8. dc sup p ly voltag e ........................................................................................................ 10 9. layout considerations ................................................................................................... 11 9.1. power and ground .................................................................................................. 11 10. electrical characteristics .............................................................................................. 12 10.1. absolute maximum ratings* ................................................................................. 12 10.2. recommended oper ating conditions* .................................................................. 12 10.3. dc electrical characteristics* ............................................................................... 13 10.4. ac electrical characteristics* ................................................................................ 14 11. package ....................................................................................................................... 15 table of figures figure 1: block diagram ...................................................................................................... 3 figure 2: AG1171 pac k age format ...................................................................................... 4 figure 3: ringing signal waveforms ................................................................................... 7 figure 4: typical connection diagram ................................................................................. 9 figure 5: optional emi suppression .................................................................................. 11 ? silver telecom 2006 2
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic 3. ag1 171 product selector part n u m b e r i m p e d a n c e p a c k a g e s u p p l y vo l t a g e m a r k i n g AG1171 600 ohm sil 3.3 to 5.0 v o lt table 1: ordering information figure 1: block diagram ? silver telecom 2006 3
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic AG1171 ag117 1 1 AG1171 ag117 1 1 AG1171 ag117 1 AG1171 ag117 1 1 figure 2: AG1171 package for mat ? silver telecom 2006 4
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic 4. pin description pin # name description 1 r i n g ( b ) ring. connects to the subscriber line ring. 2 t i p ( a ) tip. connects to the subscriber line tip. 3 f / r forw a rd/r everse. a logic (l) will reverse the tip and ring voltage polarities. f/r is toggl ed to produce the ringing output. 4 r m ringing mode. sets bias conditions during ringing. must be set to logic (h) during ringing. logic (l) for other modes. 5 s h k s w itch hook. indicates an off-hook condition when at logic (h). 6 n c no connection. do not connect to this pin. 7 n c no connection. do not connect to this pin. 8 n c no connection. do not connect to this pin. 9 v in audio in. analog input signal from t he codec (which is output on tip and ring). connect via a 10nf capacitor 1 0 v ou t audio out. this is the analog out put signal (from tip and ring) to the codec. connect via a 100nf capacit or. 1 1 n c no connection. do not connect to this pin. 1 2 g n d pwr dc/dc ground. ground input for the dc/dc converter. 1 3 + v pwr dc/dc su ppl y . +5.0v or +3.3v input for the dc/dc c onverter. 1 4 p d pow e r dow n dc/dc converter . a logic (l) on this pin powers down the AG1171. do not put logic (h) on this pin. ? silver telecom 2006 5
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic 5. functional description 5.1. l i ne in terfacing as well as being us ed in an electrically demanding environment, the needs of different applications and regulatory standards means t hat the slic must be flexible, and hav e facilities to ensure robust perfo rmance. the ag117 1 sl ic provides a complete and fle x ible interface to the telephone. 5.2. battery f e ed the AG1171 has an integral dc/dc converter, which generates the battery voltage in the device. this means that only a single supp ly of between +3.3v to +5.0v is needed, unlik e conventional slics which will also need a battery voltage of any thing between 20v and 60v ( 75v for ringing). this confers a signific ant cost, space and time to market benefit on the equipm ent designer. the battery feed to the telephone line is gener ated from the positive supply rail. this provides a 48v battery feed to the line driver, which is adjusted automatically to match line conditions. in forward mode the ring voltage is negativ e with respect to the tip voltage. power efficiency is good, because the line is sup p lied with only as muc h power as is needed. lit t le excess heat is gener ated, even on short lines. the loop current is pre-set to a constant 30ma, under the conditions s h own in section 10.3 of this datasheet, which specifies the ?dc electrical c hara c teristics? for the AG1171. 5.3. ringing the ringing signal is generated by switching t he slic into ringing mode, by setting the rm pin high, and then toggling the f/r pin at the required frequency and cadence. t h e toggling of the f/r pin produc es a balanc ed signal at tip and ring. these signal waveforms are shown in f i gure 3. ringing v o ltage of approximately 60vrms is applied to a single telephone set. it is important that the rm pin is only se t high during rin g ing and that this pin is set low at all other times. during ringing the integral dc/dc converter is switched by rm (h) to produce a battery voltage of 72v. this will prod uce greater than 40vrms into 3 telephon es (with to n e ringers). the slope of the edges on the ri nging wa v e form is set internally to give the correct waveform with 20hz to 25hz ringing frequency. when an ?off-hook? condition oc curs during ringi ng, the ring-trip circuit on the AG1171 senses the loop current flowing and signals t he off-hook condition on the shk output. the shk s i gna l must be ?de-bounce d ? (by the cont rollin g processor) for 10ms to remove any spurious p u lses. the dc/dc c ontroller li mits the power. the AG1171 will oper ate continuous ly with a ring-trip load (but this is not recommended as the power dissipation is high). the ring-trip function will operate up to a loop resistance of typically 470r (includin g 300r telephone). ? silver telecom 2006 6
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic c o nd i t i o n 1 - d c op e r at i o n si g n a l no t e s in p u t r m 1 0 no r i n g i n g ou t p u t s h k 1 0 o f f hoo k d e t e c t e d of f h o o k no t e : s h k s h o u l d be d e - b o u n c e d f o r 10 m s c o n d it io n 2 - r in g i n g o n - h o o k rm 1 0 f/ r (i np ut ) 1 0 sh k 1 0 c o nd i t i o n 3 - r i n g i n g / o f f - h ook ab t h e p h o n e g o e s o f f h o o k , a n d sh k i s d e t e c t e d a t p o i n t a ( l e a d i ng e d ge ) . r m m u s t b e s w i t c h e d l o w i n < 5 0 0 m s ( p oi nt b ) , a n d t h e r i ng i ng c a de nc e s h ou l d b e r e m o ve d fro m f / r . . a s lo n g a s t h e t e le p h on e is o f f h o o k , s h k w i l l r e m a in h i g h . 1 se c 3 se c 1 se c 3 se c c o nd i t i o n 1 - d c op e r at i o n si g n a l no t e s in p u t r m 1 0 no r i n g i n g ou t p u t s h k 1 0 o f f hoo k d e t e c t e d of f h o o k no t e : s h k s h o u l d be d e - b o u n c e d f o r 10 m s c o n d it io n 2 - r in g i n g o n - h o o k rm 1 0 f/ r (i np ut ) 1 0 sh k 1 0 c o nd i t i o n 3 - r i n g i n g / o f f - h ook ab t h e p h o n e g o e s o f f h o o k , a n d sh k i s d e t e c t e d a t p o i n t a ( l e a d i ng e d ge ) . r m m u s t b e s w i t c h e d l o w i n < 5 0 0 m s ( p oi nt b ) , a n d t h e r i ng i ng c a de nc e s h ou l d b e r e m o ve d fro m f / r . . a s lo n g a s t h e t e le p h on e is o f f h o o k , s h k w i l l r e m a in h i g h . 1 se c 3 se c 1 se c 3 se c c o nd i t i o n 1 - d c op e r at i o n si g n a l no t e s in p u t r m 1 0 no r i n g i n g ou t p u t s h k 1 0 o f f hoo k d e t e c t e d of f h o o k no t e : s h k s h o u l d be d e - b o u n c e d f o r 10 m s c o n d it io n 2 - r in g i n g o n - h o o k rm 1 0 f/ r (i np ut ) 1 0 sh k 1 0 c o nd i t i o n 3 - r i n g i n g / o f f - h ook ab t h e p h o n e g o e s o f f h o o k , a n d sh k i s d e t e c t e d a t p o i n t a ( l e a d i ng e d ge ) . r m m u s t b e s w i t c h e d l o w i n < 5 0 0 m s ( p oi nt b ) , a n d t h e r i ng i ng c a de nc e s h ou l d b e r e m o ve d fro m f / r . . a s lo n g a s t h e t e le p h on e is o f f h o o k , s h k w i l l r e m a in h i g h . 1 se c 3 se c 1 se c 3 se c figure 3: ringing signal waveforms 5.4. p o wer dow n a nd synchronisation the dc/dc converter can be switched off by apply i ng a logic (l) level to the pd input. th e slic takes 50ms to power up from this state. logic outputs are not valid during this tim e . when using the power down function, it is recommended that the slic is polled (power ed up periodic a lly) to check for shk (the subscri ber has gone off-hook). if power down mod e is not required, the pd pin should be left open circuit. the pd in put should not be taken to a logic (h) as this may damage the slic. connec ting to pd via a diode will ensure it is never taken (h). note: this is a sensitive node, keep connections very short. the dc/dc has an internal oscillator. if desired, the oscillator frequency may be synchronis ed with an external clock for emi reasons. to do this, a 64khz square wav e (with 50:50 mark space) should be inputted to the pd pin. see applications note: an1171- 1, for further details. ? silver telecom 2006 7
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic 5.5. the 2-4 wire (hybrid) conv ersion the AG1171 slic transmits and receives bal anced 2 wire analog signals at the tip and ring connections. these are converted to a ground referenced output at vout and from a ground referenced input at vin. the vout and vin pins are normally connec ted to a codec or telephony dsp for conversion of audio to and from a digital format. 5. 6. t r ansmi t and receive gain the gain in both the transmit direction (tip/ri ng to vout) and the receive dir e ction (vin to tip/ring) is set to 0db. normally any gain ad justments required by the user can be made by programming the codec or telephony dsp. 5.7. the 2 wire imped a nce the 2 wire impedance at tip/ring of the ag117 1 is set to 600r. it requires no external programming resistors. 5.8. network balance impe dance the network balance impedanc e zb of the a g117 1 is set to 600r and it requires no external pr ogramming resistors. 5.9. tip & ring polarity reversal the AG1171 can reverse the battery voltage pol arity at tip and ring via the f/r pin. if f/r is held at logic ( h ) (forwa rd) the d.c. voltage at ring is negative with r e spect to tip. if f/r is taken to logic (l) (reverse) the volt age at ring is positive with respect to tip. 5. 10. on hook t r ansmission the AG1171 is capable of on-hook transmission if an external r e sistor is fitted between pins 1 (ring) and 2 (tip). this means analog s i gnals c an be transmitted fr om vin through tip a nd ring and ont o the line even when no external loop cu rrent is flowing. this can be used when sending ca lle r line identification (cli) information or for other ?no ring? calls. the AG1171 will provi de on hook transmission of audio si gnals up to 0dbm (0.775v) with a high impedance on tip/ring or with ac loads down to 600r. to achieve this the external bias resistor should have a value of 20kohm s. this will increase the vpwr idle current by 35ma. a larger value of resistor will reduce the idle current but the maximum audio s i gnal which can be transmitted will be reduced in proportion e.g. a 39kohm bias resistor wil l allow audio signals up to ?6dbm (0.387v) with an increase in idle c u rrent of 18ma. ? silver telecom 2006 8
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic components c1, c3 = 100nf c4 = 10nf c2 = 470uf, 16v aluminium electrolytic (standard type) r1 = external dc bias resistor (requi red for cli) typically 20k to 39k d1 = bzt03c82 or p6ke82 (only one needed per line card) d2 ? 5 = 1n4004 or mb4s bridge d6 = 1n41 48 or bas1 6 figure 4: typical con n ection diagram 5.11. s w itch hook detection when the subscriber goes ?off-hook? loop cu rrent will b egin to flow. if this current is above the detection threshold the swit ch hook o u tpu t, shk, will switch to a logic (h). it is recommended that software or har dware de-bouncing of the swit ch hook signal is used. this is to avoid short pulses which can caus e a false switch hook output, triggering the incorrect system respo n se. during loop disc onnect dialling, shk will pulse betwe en logic (h) and logic (l) to indic a te the digits being dialled. again it is re commended that software de-bouncin g of the pulse edges is us ed to avoid false detection of digits ? silver telecom 2006 9
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic 6. protection of the ag1 1 71 slic 6.1. thermal protection should the slic be operated in correctly, for example by a ccidentally shorting tip and rin g to each other or to ground, the power diss i pation is automatically limited by the dc/dc converter this feature means that t he slic will always operate withi n it s power limits, without overheating. when operating on ve ry short lines the battery voltage is regulated to a low value. this limits the power dissipation and ensures the AG1171 operates with a minimum temperature rise. 6.2. lightning and po wer cross protection the AG1171 is designed for use short loop ?on-premise? applic ations, such as fct, fw t, wll and voip. in this case power cross and li ghtning protection is not required. the only protection which should be required is for esd (electro static discharge) caused by handling during installation. the AG1171 has been designed to be able t o use low c o st esd protection components. a typical c i rcuit is shown in f i gure 4. t h is circuit is suitable for most ?on-premise? applications. 7. t y pical application the AG1171 has been designed to interface to telephony codec s or dsps. applications drawings f o r many codecs and dsp ch ips are av ailable. please contact silver telecom or visit our website www. silvertel.co m. an example is shown in figure 4. the status outputs from the sl ic are passed to the micro- controller. thes e signals c a n then be processed as necessary by the system software. the audio signals which are on the 4 wire side of the connection are coupled by capacitors to avoid d.c. level probl ems between the two devices. 8. dc supply v o lt age during operation the dc supply voltage must be regulated wit hi n the limits shown in the electrical characteristics ? se ction 10.0 of this datasheet. us e of a ?clean? power supply is extremely important. should the vcc supply rail go above the absolute max i mum rating of 7.0v, for even a short time, then permanent damage to the AG1171 is lik ely to result. we also advise that the designer performs a full system evaluation, under all possible performance conditions, to ensure that the vcc maximu m rating is not exceeded. ? silver telecom 2006 10
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic in some applic ations, additional emi suppr ession may be needed. in this instance capacitors can be added to filter out the hig her frequencies of the dc-dc c onverter. se e figure 5 for details. values bet ween 1nf and 10nf are suitable. ri n g ti p ring tip 1nf 1nf figure 5: optional e m i suppression 9. layout considerations 9.1. p o wer and grou n d tracks to the +vpw r and gndpwr should be ma de as thick as possible. to maximise the performance of t he device, signal tracks should be kept as short as possible. to reduce dc/dc nois e capacitors up to 10nf ma y be connected to ground at tip and ring. ? silver telecom 2006 11
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic 10. electrical characteristics 10.1. absolute maximu m rating s* p a r a m e t e r s y m b o l m i n m a x u n i t s 1 dc supply voltage v cc - 0 . 3 7 . 0 v 2 max i mum power dissipation, off hook @ 25 o c p slic 1 . 2 w 3 s t o r a g e t e m p e r a t u r e t s - 4 0 + 1 0 0 o c 4 duty cycle for rm(h) 33 % *exceeding the a bove ratings ma y cause permane nt damage to t h e product. fu nctional operation u nder these condit i ons is not imp lied. maximum ratings assume free airfl o w . 10.2. recomm ended op erating conditions * all voltages are w i th respect to gr ound unless othe r w ise stated. p a r a m e t e r s y m b o l m i n ty p m a x u n i t s 1 dc supply voltage v cc 3 . 1 5 . 5 v 2 o p e r a t i n g t e m p e r a t u r e t op 0 2 5 7 0 o c *t y p ical figures a r e at 25 c w i th n o minal +5.0v/+3.3v supplies and are for design use onl y . th e y a r e not guara n teed it is important tha t the user pe rfor ms a full sy stem evaluat ion, under all possible perf o rmance conditions, to ensure tha t the vcc maximum rating i s not exceeded. ? silver telecom 2006 12
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic 10.3. dc electrical characteristics* dc charac teristic sym min typ* max units test comments 1 supply current, on-hook @ 5.0v @ 3.3v i vpw r 60 70 90 105 ma ma cli bias resistor not fitted 2 supply current ringing 1 ren @ 5.0v @ 3.3v i ringin g 330 350 480 500 ma ma r loop = 0r load = 1 ren 3 supply current, off-hook @ 5.0v @ 3.3v i active 290 360 400 450 ma ma r loop =0r load = 300r 4 supply current during ring trip (<1 sec ma x) @ 5.0v @ 3.3v 330 350 ma ma r loop =0r load = 300r 5 supply current in power down i pd 7 5 ma ma @ 5.0v @ 3.3v 6 w a k e - u p t i m e 5 0 m s logic outputs not valid during wake-up period 7 shk debounce time 15 ms 8 constant current feed to line @ 5.0v @ 3.3v i loop 30 26 ma ma load = 300r 9 tip/gnd or ring/gnd or tip&ring/gnd overcurrent 45 50 ma ma rm = l rm = h 10 off-hook detect @5.0v output low voltage output high voltage v ol v oh 4.5 0 . 5 v v 11 off-hook detect @3.3v output low voltage output high voltage v ol v oh 2.8 0.5 v v 100ua max output (with 3.3k in ternal pull-up resistor) v il v ih 3.5 0.5 v v @ 5.0v 12 control inputs, f/r, rm input low voltage input high voltage v il v ih 2.0 0.5 v v @ 3.3v 13 control inputs, f/r, rm input low cu rrent input high current i il i ih -0.5 -0.5 0.5 0.5 ma ma v il v ih 2.0 0.5 v v @ 5.0v 14 control inputs, pd input low voltage input high voltage v il v ih 2.0 0.5 v v @ 3.3v ? silver telecom 2006 13
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic dc charac teristic sym min typ* max units test comments 15 control inputs, pd input low cu rrent input high current i il i ih -0.5 -0.5 0.5 0.5 ma ma 1) all dc electrical charac teristics are over the re commended ope r ating conditions w i th v cc at +5. 0 v + 1%,or +3. 3 v + 1%, unless other w i se stated. 2) op erating cur r ents are depe nd ent on the users application. *t y p ical figures a r e at 25 c and a r e for design aid o n ly . not guar ant eed 10.4. ac electrical characteristics* ac characteristic sy m m i n t y p* max u n i t s t e s t c o m m e n t s 1 shk detec t time 5 ms no rin ging 2 ring trip capability 4 7 0 ohm includes telephone set 3 input impedance at v in 6 0 kohm 4 output impedance at v ou t 1 0 ohm 5 ringing capability at 40v rms 3 phone note 3 6 r i n g i n g v o l t a g e 6 5 vrms no load @ 20hz 7 absolute voltage gain, 2 wire to v out -0.75 0 0 . 7 5 db off-hook 8 absolute voltage gain v in to 2wire -0.75 0 0 . 7 5 db off-hook 9 relative gain. referenced to 1khz. 2wire - v out , v in - 2 w ire - 0 . 5 0 . 5 db over frequency range 300 to 3400 hz 10 overload distortion @2 wire and v out od 0.5 5 1 % % @+3dbm, 1khz @+6dbm, 1khz 11 idle channel nois e n c 5 1 8 dbrnc @2 wire & v out 1 3 r e t u r n l o s s rl 1 8 db 300-3400hz 14 transhybrid loss thl 12 21 16 db db db 300-500hz 500-2500hz 2500-3400hz 15 load on vout 10 kohm cou p li ng capac itor = 100nf 16 tip-ring reversal settling time 5 0 ms to within + 20% of set i loop 3) this applies to 3 phones w i th t one ringers o r 2 phones w i th mechanical bells. *t y p ical figures a r e at 25 c and a r e for design aid o n ly . ? silver telecom 2006 14
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic 11. packag e 12 .0mm 61mm 3.0 0.6 0 .05 2.54 0 .25 12.7 0 .25 1.27 mm AG1171 AG1171 1 0.6 0 .05 12.0 mm ma x 6.5mm d i me nsio ns a r e n o mina l un less ot he r w i s e st a t ed 12 .0mm 61mm 3.0 0.6 0 .05 2.54 0 .25 12.7 0 .25 1.27 mm AG1171 AG1171 AG1171 AG1171 1 0.6 0 .05 12.0 mm ma x 6.5mm d i me nsio ns a r e n o mina l un less ot he r w i s e st a t ed ag117 1 ag117 1 pi n 1 r i n g (b) ti p ( a ) fr rm shk nc nc nc v in v out nc gnd p w r vpw r pd ag117 1 ag117 1 ag117 1 ag117 1 pi n 1 r i n g (b) ti p ( a ) fr rm shk nc nc nc v in v out nc gnd p w r vpw r pd silver telecom recommends the use of 2.54mm sockets, especially on prototype and pre production boards. recommended pcb hole diamet er = 1.1 0.05 mm information pu blished in this datasheet is believed to be correc t an d accurate. silver telecom assu mes no liability f o r errors wh i c h m a y occur or for liability oth e r w ise arising out of use of this information or infringement o f patents w h ich ma y occur as a result of such u s e. no license is gra n ted b y this document under pat ents ow ne d b y silv er telecom or licensed from thir d parties b y silver telecom. the products, their sp ecification and in formation appe ar ing in this docum ent are subject to change b y silver telecom w i thout notice . ? silver telecom 2006 15
v1 .0 d e c 20 06 data sheet AG1171 +3.3v / + 5 .0v low pow e r ringing slic ? silver telecom 2006 16

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