Part Number Hot Search : 
MODELC 1N5461A H8S2111B P3020 TGP6336 GP30A MK1210 4013B
Product Description
Full Text Search
 

To Download KK34118 Datasheet File

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


  Datasheet File OCR Text:
  technical data KK34118 voice switched speakerphone circuit the kk 34118 voice switched speakerphone circuit incorporates the n ecessary am p lifiers, atten u a to rs, lev e l d e tecto r s, an d co n t ro l alg o r ith m to form the heart of a high quality ha nds-free speakerphone system . included are a m i crophone am pl i f i e r wi t h adjust abl e gai n and m u te cont rol , transm it and receive attenuators which operate in a com p lem e ntary m a nner, l e vel det ect ors at bot h i nput and out put of bot h at t e nuat o rs, and background noise m onitors for both th e transm it and receive channels. a di al tone det ect or prevent s t h e di al t one from bei ng at t e nuat e d by t h e receive background noise m onitor circ uit. also included are two line dri v er am pl i f i e rs whi c h can be used t o form a hy bri d net w ork i n co n j u n c tio n with an ex tern al co u p lin g tran sfo r m e r. a h i g h p a ss filter can be used to filter out 60 hz noise in the receive channel, or for other filterin g fu n c tio n s . a ch ip disab l e p i n p e rm its p o w erin g d o w n th e en tire ci rcui t t o conserve power on l ong l oops where l oop current i s at a mi n i mu m. ordering information kk 34118n plastic kk 34118dw soic t a = -25 to 7 0 c for all packages the kk 34118 may be operated from a power supply, or it can be powered from t h e t e l e phone l i n e, requi ri ng t y pi cal l y 5.0 m a . the KK34118 can be interfaced directly to tip and ri ng (through a coupling transform e r) for st and-al one operat i on, or i t can be used i n conjunct i on wi t h a handset speech network and or other features of a feature phone. pin assignment ? im proved at t e nuat o r gai n r a nge: 52 db b e t w een transm i t and receive ? low vol t a ge operat i on for li ne-powered appl i cat i ons (3.0-6.5 v) ? 4 po in t sig n a l sen s in g fo r im p r o v e d sen s itiv ity ? background noise monitors for bo th transm it and receive paths ? m i crophone am pl i f i e r gai n set by ext e rnal r e si st ors - m u t e funct i on incl uded ? c h i p di sabl e for act i v e st andby operat i on ? on bo ard filter pin n e d - ou t fo r user defin e d fu n c tio n ? dial tone detector to inhibit r eceive idle mode during dial tone presence 1
KK34118 simplified block diagram functional description introduction the fundam e nt al di fference bet w een t h e operat i on of a speakerphone and a handset i s t h at of hal f-dupl ex versus ful l - dupl ex. the handset i s ful l dupl ex si nce conversat i on can occur i n bot h di rect i ons (t ransm i t and receive) sim u ltaneously. a sp eakerphone has higher gain l e vel s i n bot h pat h s, and at t e m p t i ng t o converse ful l duplex results in oscillatory problem s due to the loop t h at exi s t s wi t h i n t h e sy st em . the l oop i s form ed by t h e receive and transm it paths, the hybrid, and the acoustic coupl i ng (speaker t o m i crophone). the onl y pract i cal and econom i cal sol u t i on used t o dat a i s t o desi gn t h e speakerphone t o funct i on i n a hal f dupl ex m ode - i . e., onl y one person speaks at a t i m e, whi l e t h e ot her l i s t e ns. to achieve this requires a circuit which can detect who is talk in g , switch o n th e ap p r o p r iate p a th (tran s m it o r receive), and switch off (attenua te) the other path. in this way , t h e l oop gai n i s m a i n t a i n ed l e ss t h an uni t y . w h en the talkers exchange function, th e circu it m u st q u i ck ly d e tect th is, an d switch th e circu it ap p r o p r iately. by providing speech level detectors, the circuit operates in a ?hand-free? m ode, elim inating the need for a ?push-to- talk ? switch . the handset , by t h e way , has t h e sam e l oop as t h e speakerphone. b u t si nce t h e gai n s are consi d erabl y lower, and since the acoustic coupling from the earpiece to the m outhpiece is alm o st non- existent (the receiver is norm a lly held against a person?s ear), oscillations don?t occur. the kk 34118 provides the nece ssary level detectors, at t e nuat o rs, and swi t c hi ng cont rol for a properl y operating speakerphone. the de tection sensitivity and tim in g are ex tern ally co n t ro llab l e. ad d itio n a lly, th e kk3 4118 provides background noise monitors which m a k e th e circu it in sen s itiv e to ro o m an d lin e n o i se, hy bri d am pl i f i e rs for i n t e rfaci ng t o ti p and r i ng, t h e m i crophone am pl i f i e r, and ot her associ at ed funct i ons. attenuators the transm it and receive attenuators are com p l e m e nt ary i n funct i on, i . e., when one i s at m a xi m u m gai n (+6.0 db ), t h e ot her i s at m a xi m u m at t e nuat i on (-46 db ), and vi ce versa. they are never bot h ful l y on or bot h ful l y off. the sum of t h ei r gai n s rem a i n s const a nt (wi t h i n a nom i n al error band of 0.1 db ) at a t y pi cal val u e of -40 db . thei r purpose i s t o cont rol t h e transm it and receive paths to provide the half-duplex operat i on requi red i n a speakerphone. the at t e nuat o rs are non-i nvert i ng, and have a -3.0 db (from m a x gain) frequency of 100 khz. the i nput im pedance of each attenuator (txi and rxi) is nom i n al l y 10 k ? (see fi gure 1), and t h e i nput si gnal shoul d be l i m i t e d t o 350 m v rm s (990 m v p-p) t o prevent di st ort i on. that m a xi m u m 2
recom m e nded i nput si gnal i s i ndependent of t h e vol um e cont rol set t i ng. the di ode cl am p on t h e i nput s l i m i t s t h e i nput swi ng, and t h erefore t h e m a xi m u m negat i v e out put swin g . th is is th e reaso n fo r v rxol and v txol speci fi cat i on bei ng defi ned as they are in the electrical c h aract eri s t i c s. the out put i m pedance i s <10 ? u n til th e output current lim it (typically 2.5 m a ) is reached. figure 1. attenuator input stage the at t e nuat o rs are cont rol l e d by t h e si ngl e out put of th e co n t ro l blo c k , wh ich is m easu r ab le at th e c t pi n (pin 1 4 ) . w h en th e c t pin is at +240 m illivolts with respect to v b , the circuit is in the receive m ode (receive atten u a to r is at +6 .0 d b ). w h en th e c t pi n i s at - 240 m illivolts with respect to v b , th e circu it is in th e tran sm it m o d e (tran s m it atten u a to r is at +6 .0 d b ). th e circu it is in an id le m o d e wh en th e c t v o ltag e is eq u a l to v b , cau sin g th e atten u a to rs? g a in s to b e h a lfway b e tween their fully on and fully o ff positions (-20 db each). m oni t o ri ng t h e c t v o ltag e (with resp ect to v b ) is th e m o st di rect m e t hod of m oni t o ri ng t h e ci rcui t ? s m ode. the i nput s t o t h e c ont rol b l ock are seven: 2 from t h e com p arat ors operat e d by t h e l e vel det ect ors, 2 from t h e background noi se m oni t o rs, t h e vol um e cont rol , t h e di al - t one det ect or, and t h e agc ci rcui t . these seven i nput s are descri bed bel o w. level detectors there are four level detectors - two on the receive si de and t w o on t h e t r ansm i t si de. r e fer t o fi gure 2 - t h e t e rm s i n parent heses form one sy st em , and t h e ot her t e rm s form t h e second sy st em fi gure 2. l e vel detectors each lev e l d e tecto r is a h i g h g a in am p lifier with back-t o-back di odes i n t h e feedback pat h , resul t i ng i n non-l i n ear gai n , whi c h perm i t s operat i on over a wi de dynam i c range of speech levels. the sensitivity of each lev e l d e tecto r is d e term in ed b y th e ex tern al resisto r an d capacitor at each input (tli1, tli2, rli1, and rli2). each out put charges an ext e rnal capaci t o r t h rough a di ode and l i m i t i ng resi st or, t hus provi di ng a dc represent a t i on of t h e i nput ac si gnal l e vel . the out put s have a qui ck ri se t i m e (det erm i ned by t h e capaci t o r and an i n t e rnal 350 ? resistor), and a slow decay tim e set by an internal current source and the capaci t o r. the capaci t o rs on t h e four out put s shoul d have t h e sam e val u e ( 10%) t o prevent t i m i ng probl em s. referring to figure 8, on th e receive side, one level detector (rli1) is at the receive input receiving the sam e si gnal as at ti p and r i ng, and 3 KK34118
t h e ot her (r li2) i s at t h e out put of the speaker am plifier. on th e tran sm it sid e , o n e lev e l d e tecto r (tli2 ) is at th e out put of t h e m i crophone am pl i f i e r, whi l e t h e ot her (tli1) i s at t h e hy bri d out put . out put s r l o1 and tlo1 feed a com p arat or, t h e out put of whi c h goes t o t h e at t e nuat o r c ont rol b l ock. li kewi se, out put s r l o2 and tlo2 feed a second com p arat or whi c h al so goes t o t h e at t e nuat o r c ont rol b l ock. the t r ut h t a bl e for t h e effect s of t h e l e vel det ect ors on t h e c ont rol b l ock i s gi ven i n t h e sect i on descri bi ng t h e c ont rol b l ock. background noise monitors the purpose of t h e background noi se m oni t o rs i s t o distinguish speech (which consists of bursts) from background noi se (a rel a t i v el y const a nt si gnal l e vel ) . there are t w o background noi se m oni t o rs - one for t h e receive path and one for the transm it path. referring to figure 2, the receive background noise m onitor is operat e d on by t h e r l i1-r lo1 l e vel det ect or, whi l e t h e t r ansm i t background noi se m oni t o r i s operat e d on by t h e tli2-tlo2 l e vel det ect or. they m oni t o r t h e background noi se by st ori ng a dc vol t a ge represent a t i v e o f th e resp ectiv e n o i se lev e ls in cap acito rs at cpr an d c p t. the vol t a ges at t h ese pi ns have sl ow ri se t i m es (determ i ned by the external rc), but fast decay tim es. if t h e si gnal at r l i1 (or tli2) changes sl owl y , t h e vol t a ge at cpr (o r cpt) will rem a in m o re p o s itiv e th an th e vol t a ge at t h e non-i nvert i ng i nput of t h e m oni t o r?s output com p arator. w h en speech is present, the voltage on the non-inverting input of the com p arator will rise qui cker t h an t h e vol t a ge at t h e i nvert i ng i nput (due t o t h e burst characteristic of sp eech), causing its output to change. thi s out put i s sensed by t h e at t e nuat o r c ont rol b l ock. the 36 m v offset at t h e com p arat or?s i nput keeps t h e com p arator from changing state unless the speech level exceeds the background noise by 4.0 db . the t i m e const a nt of t h e ext e rnal r c ( 4.7 seconds) det e rm i n es t h e response t i m e t o background noi se vari at i ons volume control the vol um e cont rol i nput at vlc (pi n 13) i s sensed as a v o ltag e with resp ect to v b . the vol um e cont rol affects the attenuators only in the receive m ode. it has no effect in th e id le o r tran sm it m o d e s. w h en in the receive m ode, the gain of the receive atten u a to r will b e +6 .0 d b , an d th e g a in o f th e tran sm it atten u a to r will b e -4 6 d b o n l y wh en vlc is eq u a l to v b . as vlc is reduced below v b , the gain of the receive attenua tor is reduced, and the gain o f th e tran sm it atten u a to r is in creased su ch th at th eir su m rem a i n s const a nt . c h angi ng t h e vol t a ge at vlc changes th e v o ltag e at c t (see t h e at t e nuat o r c ont rol b l ock sectio n ) , wh ich in tu rn co n t ro ls th e atten u a to rs. the vol um e cont rol set t i ng does not affect t h e m a xi m u m at t e nuat o r i nput si gnal at whi c h not i ce abl e di st ort i on occurs. the bi as current at vlc i s t y pi cal l y 60 na out of t h e pi n, and does not vary si gni fi cant l y wi t h t h e vlc vol t a ge or wi t h v cc . dial tone detector the di al t one det ect or i s a com p arat or wi t h one si de connected to the receive input (rxi) and the other input connected to v b with a 15 m v offset (see figure 3). if the circuit is in the recei ve m ode, and the incom i ng si gnal i s great er t h an 15 m v (10 m v rm s), t h e com p arator?s output will cha nge, disabling the receive idle m ode. the receive attenuator will then be at a set t i ng det e rm i n ed sol e l y by t h e vol um e cont rol . th e p u r p o s e o f th is circu it is to p r ev en t th e d i al to n e (whi ch woul d be consi d ered as cont i nuous noi se) from fadi ng away as t h e ci rcui t woul d have t h e t e ndency t o switch to the idle m ode. by disabling the receive idle m ode, the dial tone rem a ins at the norm a lly expected full lev e l. fi gure 3. di al t o ne detector agc the agc circuit affects th e circu it o n l y in th e receive m ode, and only when the supply voltage (v cc ) is less th an 3 . 5 v o lts. as v cc falls b e lo w 3 . 5 v o lts, th e g a in of the receive attenuator is reduced. the transm it path atten u a tio n ch an g e s su ch th at th e su m o f th e tran sm it and receive gains rem a ins constant. the purpose of t h i s feat ur e is to reduce the power (and current ) used by t h e sp eaker when a line-powered speakerphone i s connect ed t o a l ong l i n e, where t h e av ailab l e p o w er is lim ited . by red u c in g th e sp eak er power, t h e vol t a ge sag at v cc i s cont rol l e d, prevent i ng possi bl e errat i c operat i on. 4 KK34118
attenuator control block the at t e nuat o r c ont rol b l ock has t h e seven i nput s descri bed above: - the out put of t h e com p arat or operat e d by r l o2 and tlo2 (m i c rophone/ s peaker si de) - desi gnat e d c 1 . - the out put of t h e com p arat or operat e d by r l o1 and tlo1 (ti p / r i ng) si de) - desi gnat e d c 2 . - the out put of t h e t r ansm i t background noi se m oni t o r - desi gnat e d c 3 . - the output of the receive background noise m oni t o r - desi gnat e d c 4 . - the vol um e cont rol . - the di al t one det ect or. - the agc circuit. the si ngl e out put of t h e c ont rol b l ock cont rol s t h e two atten u a to rs. th e effect o f c1 -c4 is as fo llo ws: i n p u t s o u t p u t c 1 c 2 c 3 c 4 m o d e t x t x 1 x transm i t t x r x y y f a s t i d l e r x t x y y f a s t i d l e r x r x x 1 r e c e i v e t x t x 0 x s l o w idle t x r x 0 0 sl o w idl e r x t x 0 0 sl o w idl e rx r x x 0 slo w id le x = don?t c a re; y = c 3 and c 4 are not bot h 0 a defi ni t i on of t h e above t e rm s: 1) ?tran s m it? m ean s th e tran sm it atten u a to r is fu lly on (+6.0 db), and the receive attenuator is at m a x. at t e nuat i on (-46 db ). 2) ?receive? m eans both attenuators are controlled by the volum e control. at m a x. volum e, the receive atten u a to r is fu lly o n (6 .0 d b ), an d th e tran sm it at t e nuat o r i s at m a x. at t e nuat i on (-46 db ). 3) ?fast idle? m eans both transm it and receive speech are p r esen t in ap p r o x i m a tely eq u a l lev e ls. th e atten u a to rs are q u i ck ly switch e d (3 0 m s ) to id le until one speech level dom inates the other. 4) ?slow idle? m eans speech has ceased in both transm it and receive path. the attenuators are then sl owl y swi t c hed (1 second) t o t h e i d l e m ode. 5) switching to the full transm it or receive m odes from any other m ode is at the fast rate (30 m s ). a su m m a ry o f th e tru t h tab l e is as fo llo ws: 1) th e circu it will switch to tran sm it if: a) b o t h t r ansm i t l e vel det ect ors sense hi gher si gnal l e vel s relative to the respective r eceive level detectors (tli1 versus r l i1, tli2 versus r l i2), and b) t h e t r ansm i t background noi se m oni t o r i ndi cat es t h e presence of speech. 2) the circuit will switch to r eceive if: a) both receive lev e l d e tecto r s sen s e h i g h e r sig n a l lev e ls relativ e to th e respective transm it level det ectors, and b) the receive background noi se m oni t o r i ndi cat es t h e presence of speech. 3) th e circu it will switch to th e fast id le m o d e if th e l e vel det ect ors di sagree on t h e rel a t i v e st rengt hs of t h e si gnal l e vel s , and at l east one of t h e background noi se m onitors indicates speech. for exam ple, referring to the expanded logi c di agram (fi gure 8), i f t h ere i s suffi ci ent si gnal at t h e m i crophone am p out put (tli2) t o overri de t h e speaker si gnal (r li2), and t h ere i s sufficient signal at the receive input (rli1) to override t h e si gnal at t h e hy bri d out put (tli1), and ei t h er or bot h background m onitors indicate speech, then the circuit will be in the fast idle m ode. two conditions which can cau se th e fast id le m o d e to occur are a) when both talk ers are attem p tin g to g a in co n t ro l o f th e system b y talk in g at th e sam e tim e, an d b ) wh en o n e talk er is in a very noi sy envi ronm ent , forci ng t h e ot her t a l k er t o cont i nual l y overri de t h at noi se l e vel . in general , t h e fast id le m o d e will o ccu r in freq u e n tly. 4) th e circu it will switch to th e slo w id le m o d e wh en a) both talkers are quiet (no speech present), or b) when one talker?s speech level is continuously overriden by noise at the other speaker?s location. th e tim e req u i red to switch th e circu it b e tween transm it, receive, fast idle and slow idle is determ ined in part by t h e com ponent s at t h e c t pi n (pi n 14). a sch e m a tic o f th e c t ci rcui t r y i s shown i n fi gure 4 and o p e rates as fo llo ws: - r t i s t y pi cal l y 120 k ? , and c t t y pi cal l y 5.0 f. - to switch to the receive m ode, i 1 is tu rn ed o n (i 2 is off), chargi ng t h e ext e rnal capaci t o r t o +240 m v above v b . (an internal clam p prevents further charging of the capacitor.) - to switch to th e tran sm it m o d e , i 2 is tu rn ed o n (i 1 is off) bringing down the voltage on the capacitor to - 240 m v wi t h respect t o v b . - to switch to id le q u i ck ly (fast id le), th e cu rren t sources are turned off, and the internal 2.0 k ? resisto r is switch e d in , d i sch a rg in g th e cap acito r to v b wi t h a t i m e const a nt = 2.0 k ? x c t . - to switch to id le slo w ly (slo w id le), th e cu rren t sources are turned off, the switch at the 2.0 k ? resi st or i s open, and t h e capaci t o r di scharges t o v b t h rough t h e ext e rnal resi st or r t with a tim e co n s tan t = r t x c t . 5 KK34118
figure 4. ct attenuator control block circuit microphone amplifier the m i crophone am pl i f i e r (pi n 10, 11) has t h e non- i nvert i ng i nput i n t e rnal l y connect ed t o v b , wh ile th e i nvert i ng i nput and t h e out put are pi nned out . unl i k e m o st op-am ps, t h e am pl i f i e r has an al l - npn out put st age, whi c h m a xi m i zes phase m a rgi n and gai n -bandwi d t h . th is featu r e en su res stab ility at g a in s less th an u n ity, as well as with a wide range of reactive loads. the open l oop gai n i s t y pi cal l y 80 db (f<100 hz), and t h e gai n - bandwi d t h i s t y pi cal l y 1.0 m h z. the m a xi m u m p-p out put swi ng i s t y pi cal l y 1.0 vol t l e ss t h an v cc with an out put i m pedance of <10 ? u n til cu rren t lim itin g is reached (typically 1.5 m a ). i nput bias current at mci is t y pi cal l y 40 na out of t h e pi n. figure 5. microphone amplifier and mute th e m u tin g fu n c tio n (pin 1 2 ) , wh en activ ated , will red u ce th e g a in o f th e am p lifier to = -3 9 d b (will rmi = 5.1 k ? ) by short i ng t h e out put t o t h e i nvert i ng i nput (see fi gure 5). the m u t e i nput has a t h reshol d of 1.5 vol t , and t h e vol t a ge at t h i s pi n m u st be kept wi t h i n t h e range of ground and v cc . if t h e m u t e funct i on i s not used, t h e pi n shoul d be grounded. hybrid amplifiers th e two h y b r id am p lifiers (at hto+, hto-, an d hti), in co n j u n c tio n with an ex tern al tran sfo r m e r, provi de t h e t w o-t o -four wi re convert er for i n t e rfaci ng t o t h e t e l e phone l i n e. the gai n of t h e fi rst am pl i f i e r (hti t o hto-) is set by external resistors (gain = -r hf /r hi in fi gure 8), and i t s out put dri v es t h e second am pl i f i e r, t h e g a in o f wh ich is in tern ally set at -1 .0 . un lik e m o st o p - am ps, t h e am pl i f i e rs have an al l - npn out put st age, whi c h m a xi m i zes phase m a rgi n and gai n -bandwi d t h . th is featu r e en su res stab ility at g a in s less th an u n ity, as well as with a wide range of reactive loads. the open l oop gai n of t h e fi rst am pl i f i e r i s t y pi cal l y 80 db , and t h e gain bandwidth of each am plifier is 1.0 m h z. the m a xim u m p-p output swing of each am plifier is typically 1 . 2 v o lts less th an v cc wi t h an out put i m pedance of <10 ? until current lim iting is reached (typically 8 . 0 m a ). th e o u t p u t cu rren t cap ab ility is g u a ran t eed to be a m i ni m u m of 5.0 m a . the bi as current at hti i s t y pi cal l y 30 na out of t h e pi n. the connect i ons t o t h e coupl i ng t r ansform e r are shown i n t h e expanded logi c di agram (fi gure 8). the bl ock l a bel e d zbal i s t h e bal a nci ng net w ork necessary t o m a tch th e lin e im p e d a n ce. filter th e o p e ratio n o f th e filter circu it is d e term in ed b y t h e ext e rnal com ponent s. the ci rcui t wi t h i n t h e KK34118, from pi ns fi t o fo i s a buffer wi t h a hi gh i nput i m pedance (>1.0 m ? ), and a l o w out put i m pedance (<50 ? ). the confi gurat i on of t h e ext e rnal com ponent s d e term in es wh eth e r th e circu it is a h i g h - p a ss filter (as sh o w n in fig u r e 8 ) , a lo w-p a ss filter, o r a b a n d - p a ss filter. fi gure 6. hi gh pass fi l t er as a high pass filter, with the com ponents shown in figure 6 the filter will keep out 60 hz (and 120 hz) hum whi c h can be pi cked up by t h e ext e rnal t e l e phone l i n es. 6 KK34118
as a lo w p a ss filter (fig u r e 7 ) , it can b e u s ed to ro ll off the high and frequencies in the receive circuit, which ai ds prot ect i ng agai nst acoust i c feedback probl em s. w i t h an appropri a t e choi ce of an i nput coupl i ng capaci t o r t o th e lo w p a ss filter, a b a n d p a ss filter is fo rm ed . the out put vol t a ge at v b (pin 1 5 ) is (v cc - 0.7)/ 2 , and provi des t h e ac ground for t h e sy st em . the out put i m pedance at v b is 400 ? , and i n conjunct i on wi t h t h e external capacitor at v b , fo rm s a lo w p a ss filter fo r power suppl y reject i on. figure 7. low pass filter since v b bi ases t h e m i crophone and hy bri d am pl i f i e rs, t h e am ount of suppl y reject i on at t h ei r o u t p u t s is d i rectly related to th e rej ectio n at v b , as well as their respective gains. the c h i p di sabl e (pi n 3) perm i t s poweri ng down t h e ic t o conserve power and/ or for m u t i ng purposes. w i t h cd 0.8 vol t s , norm a l operat i on i s i n effect . w i t h cd 2.0 vol t s and v cc , t h e ic i s powered down. in t h e powered down m ode, t h e m i crophone and t h e hy bri d am pl i f i e rs are di sabl ed, and t h ei r out put s go t o a hi gh i m pedance st at e. addi t i onal l y , t h e bi as i s rem oved from th e filter (pin s 1 , 2 ) , th e atten u a to rs (pin s 8 , 9 , 2 1 , 2 2 ) , or from pi ns 13, 14, and 15 (t he at t e nuat o rs are di sabl ed, however, and will not pass a signal). the input i m pedance at c d i s t y pi cal l y 90 k ? , has a t h reshol d of 1.5 vol t s , and t h e vol t a ge at t h i s pi n m u st be kept wi t h i n t h e range of ground and v cc . if c d i s not used, t h e pi n shoul d be grounded. power supply, v b , and chip disable the power suppl y vol t a ge at v cc (pin 4 ) is to b e bet w een 3.5 and 6.5 vol t s for norm a l operat i on, wi t h reduced operat i on possi bl e down t o 2.8 vol t s . pin description pin no designation description 1 f o filter o u t p u t . ou tp u t im p e d a n ce is less th an 5 0 ? . 2 f i filter input. input im pedance is greater than 1.0 m ? . 3 c d c h i p di sabl e. a l ogi c l o w (<0.8 v) set s norm a l operat i on. a l ogi c hi gh (>2.0 v) di sabl es t h e ic t o conserve power. input i m pedance i s nom i n al l y 90 k ? . 4 v cc a suppl y vol t a ge of +2.8 t o +6.5 vol t s i s requi red, at 5.0 m a . as v cc falls from 3.5 to 2.8 volts, an agc circuit redu ces the receive attenuator gain by 25 db (when in the receive m ode). 5 hto+ out put of t h e second hy bri d am pl i f i e r. th e gai n i s i n t e rnal l y set at -1.0 t o provi de a di fferent i a l out put , i n conjunct i on wi t h hto-, t o t h e hy bri d t r ansform e r. 6 hto- ou tp u t o f th e first h y b r id am p lifier. th e g a in o f th e am p is set b y ex tern al resisto r s. 7 h t i input and sum m i ng node for t h e fi rst hy bri d am pl i f i e r. dc l e vel i s v b. 8 txo ou tp u t o f th e tran sm it atten u a to r. dc lev e l is ap p r o x i m a tely v b . 9 txi input t o t h e t r ansm i t at t e nuat o r. m a x. si gnal l e vel i s 350 m v rm s. input i m pedance is 10 k ? . 10 m c o out put of t h e m i crophone am pl i f i e r. the gai n of t h e am pl i f i e r i s set by ext e rnal resistors. 1 1 m c i input and sum m i ng node of t h e m i crophone am pl i f i e r. dc l e vel i s v b . (cont i nued) 7 KK34118
pin description pin no designation description 12 m u t m u t e i nput . a l ogi c l o w (<0.8 v) set s norm a l operat i on. a l ogi c hi gh (>2.0 v) m u t e s t h e m i crophone am pl i f i e r wi t hout affect i ng t h e rest of t h e ci rcui t . input i m pedance i s nom i n al l y 90 ? . 13 vlc vol u m e cont rol i nput . w h en vlc = v b , the receive attenuator is at m a xim u m gain when in the receive m ode. w h en vlc = 0.3 v b , the receive gain is down 35 db. does not affect the transm it m ode. 1 4 c t an r c t h i s pi n set s t h e response t i m e for t h e ci rcui t t o swi t c h m odes. 1 5 v b an out put vol t a ge v cc / 2 . thi s vol t a ge i s a sy st em ac ground, and bi ases t h e v o l u m e co n t ro l. a filter cap is req u i red . 16 c p t an r c at t h i s pi n set s t h e t i m e const a nt for t h e t r ansm i t background m oni t o r. 17 tli2 input t o t h e t r ansm i t l e vel det ect or on t h e m i ke speaker si de. 18 tlo2 out put of t h e t r ansm i t l e vel det ect or on t h e m i ke/ s peaker si de, and i nput t o t h e t r ansm i t background m oni t o r. 19 rlo2 output of the receive level detector on the m i ke/speaker side. 20 rli2 input to the receive level detector on the m i ke/speaker side. 21 rxi input to the receive attenuator and dial tone detector. max input level is 350 m v r m s. input i m pedance i s 10 k ? . 22 rxo output of the receive attenua tor. dc level is approxim a tely v b . 23 tli1 input t o t h e t r ansm i t l e vel det ect or on t h e l i n e si de. 24 tlo1 out put of t h e t r ansm i t l e vel det ect or on t h e l i n e si de. 25 r l o 1 output of the receive level detector on the line side, and input to the receive background m oni t o r. 26 rli1 input the receive leve l detector on the line side. 27 cpr an rc at this pin sets the tim e c onstant for the receive background m onitor. 28 gnd ground pi n for t h e ent i r e ic. maximum ratings * s y m b o l p a r a m e t e r v a l u e u n i t v cc suppl y vol t a ge (pi n 14) -1.0 t o +7.0 v v in input vol t a ge at c d (pi n 3), m u t (pi n 12) -1.0 t o v cc +1.0 v v v in input vol t a ge at vlc (pi n 13) -1.0 t o v cc +0.5 v v v in input vol t a ge at txi(pi n 9), r x i (pi n 21), fi (pi n 2) -0.5 t o v cc +0.5 v v tst g st orage tem p erat ure r a nge -65 t o +150 c * m a xi m u m r a t i ngs are t hose val u es bey ond whi c h dam a ge t o t h e devi ce m a y occur. functional operation should be restricted to the reco m m e nded operating conditions. 8 KK34118
recommended operating conditions s y m b o l p a r a m e t e r m i n m a x u n i t v cc suppl y vol t a ge (pi n 4) 3.5 6.5 v v in input vol t a ge at c d (pi n 3), m u t (pi n12) 0 v cc v i vb v b c u rrent (pi n 15) 500 a v in input vol t a ge at vlc (pi n 13) 0.3 x v b v b v v in at t e nuat o r input si gnal vol t a ge (pi n s 9, 21) 0 350 m v rm s g m i crophone am pl i f i e r, hy bri d am pl i f i e r gai n 0 40 db i l load c u rrent r xo, txo pi ns 8,22) m c o (pi n 10) hto-, hto+ (pins 6,5) 0 0 0 2.0 1.0 5.0 ma t a operat i ng tem p erat ure -25 +70 c thi s devi ce cont ai ns prot ect i on ci rcui t r y t o guard agai ns t dam a ge due t o hi gh st at i c vol t a ges or el ect ri c fi el ds. however, precautions m u st be taken to avoid applications of any voltage highe r than m a xim u m rated voltages to this hi gh-i m pedance ci rcui t . for proper operat i on, v in and v out shoul d be const r ai ned t o t h e range gnd (v in or v out ) v cc . unused i nput s m u st al way s be t i e d t o an appropri a t e l ogi c vol t a ge l e vel (e.g., ei t h er gnd or v cc ). unused out put s m u st be l e ft open. electrical characteristics (t a = -25 to +70 c, v cc = 5.0 v , c d = 0.8 v, unl ess not ed) symbol parameter test conditions guaranteed limits unit m i n m a x power supply i cc v cc suppl y c u rrent v cc =6.5 v, cd =0.8 v v cc =6.5 v, cd =2.0 v - - 10 1.0 ma r cd c d input r e si st ance v cc = v cd = 6.5 v 37.5 - kk ? v cdh c d input hi gh vol t a ge v cc = v cd = 6.5 v 2.0 v cc v v cdl c d input low vol t a ge v cc = v cd = 6.5 v 0 0.8 v v b v b out put vol t a ge 1.35 3.0 v attenuator (vlc = v b , unl ess not ed) g rx g rx ? g rx1 * ? g rx2 * g rx1 ? g rx3 * receive attenuator gain ( f =1.0 khz) r x m ode, r x i=150 m v rm s, (v cc =5.0 v) r x m ode, r x i=150 m v rm s (v cc =3.5 v) gai n c h ange -v cc =3.5 v versus v cc =5.0 v agc gain change - v cc =2.8 v versus v cc =5.0 v idl e m ode, r x i=150m vrm s r a nge (r x t o tx m ode) 1.5 1.5 -0.5 - -25 49 10.0 10.0 +0.5 -15 -15 54 db v cr * vol u m e c ont rol r a nge r x m ode, 0.3v b KK34118
electrical characteristics (t a = -25 to +70 c, v cc = 5.0 v , c d = 0.8 v, unl ess not ed) symbol parameter test conditions guaranteed limits unit m i n m a x ? v rxo ? rxo dc voltage rx to tx mode - 190 mv v rxoh rxo high voltage i out = -1.0 m a ,rxi=v b +1.5v, v ct =2.6 v 2 . 8 - v v rxol rxo low voltage i out = +1.0 m a ,rxi=v b -1.0v, v ct =2.6 v output m easured with respect to v b - v b - 0 . 7 5 v r rxi r x i input r e si st ance r x i=350 m v rm s, f = 1.0 khz 5.25 17.5 k ? g tx g txi ? g txi * tran sm it atten u a to r gain ( f =1.0 khz) tx m ode, txi=150 m v rm s idl e m ode, r x i=-150 m v rm s r a nge (tx t o r x m ode) 1.5 -25 49 10.0 -15 54 db ? v txo ? txo dc voltage tx to rx mode - 190 mv v txoh txo high voltage i out = -1.0 m a ,txi=v b +1.5v, v ct =1.6 v 2 . 8 - v v txol txo low voltage i out = +1.0 m a ,txi=v b -1.0v, v ct =1.6 v output m easured with respect to v b - v b - 0 . 7 5 v r txi txi input r e si st ance txi=350 m v rm s, f = 1.0 khz 5.25 17.5 k ? attenuator control i ctr c t source c u rrent (swi t c hi ng t o r x m ode) f = 1 khz, v lc = v b =c t - 1 0 6 - 3 0 a i ctt c t si nk c u rrent (swi t c hi ng t o tx m ode) f = 1 khz, v lc = v b =c t + 3 0 + 1 0 6 a r fi * c t fast idle internal resistance 1 . 5 3 . 6 k ? v dt * di al tone det ect or threshol d 10 20 m v microphone amlifier (v mut 0.8 v, a+ = 31 db , unl ess ot herwi s e not ed) mco vos out put offset v mco - v b , feedback r = 180 k ? - 6 2 + 6 2 m v a volm open loop gai n f = 100 hz 60 - db v mcoh out put hi gh vol t a ge i out =-1.0 m a ,v mci =v b +1.5 v 2.8 - v v mcol output low voltage i out =1.0 m a , v mci =v b - 1.0 v - 250 m v gm t m u t i ng ( ? gain) f = 1.0 khz,v mci = 150 m v 0.8 v v mut 2.0 v 5 2 - db r mut m u t input r e si st ance v cc = v mut = 6.5 v 37.5 - k ? v muth m u t input -hi gh 2.0 v cc v v mutl m u t input -low 0 0.8 v (cont i nued) 10 KK34118
electrical characteristics (t a = -25 to +70 c, v cc = 5.0 v , c d = 0.8 v, unl ess not ed) symbol parameter test conditions guaranteed limits unit m i n m a x hybrid amplifiers h vos hto - offset v hto- - v b , feedback r= 51 k ? v b - 25 v b + 2 5 m v hb vos hto - to hto+ offset feedback r= 51 k ? v b - 37 v b + 3 7 m v a volh open loop gai n hti t o hto-, f = 100 hz, v hti = 20 m v 5 7 - db a vclh c l osed loop gai n hto- t o hto+ -2.8 2.2 db v ht-h hto- high voltage i out =-5.0 m a , v hti =v b -1.0 v 2.8 - v v ht-l hto- low voltage i out =5.0 m a , v hti =v b +1.5 v - 375 m v v ht+h hto+ high voltage i out =-5.0 m a ,v hti =v b +1.5 v 2.8 - v v ht+l hto+ low voltage i out =5.0 m a , v hti =v b -1.0 v - 562 m v level detectors and background noise monitors i th * transm it-receive switching threshol d ratio o f cu rren t at rli1 + rli2 t o 20 a at tli1 + tli2 to switch fro m tx to rx 0 . 8 1 . 2 filter fo vos voltage offset at fo v fo -v b , 220 k ? from v b to fi v b - 250 v b + 2 5 m v i fo fo si nk c u rrent v b = v fo , v fi = 0 v 112 500 a note. 1. all currents into a device pin are positive, those out of a pin are negative. alge braic convention rather than m a g n itu d e is u s ed to d e fin e lim its. * @25 c 11 KK34118
figure 8. expanded logic diagram 12 KK34118
figure 9. kk 34118 application circuit (basic line powered speakerphone) 1. 0 k 0. 2 0. 1 0. 1 5. 1 k 10 9 8 10 k 5. 1 k 5. 1 k tx o tl i 1 0. 1 0. 1 82 0 300 0. 05 ht i ht o - ht o+ r r 5 0. 01 ho o k sw it c h ti p ri n g di s - abl e 100 0 f (n ot e 3) 1n 4733 5. 1 v 4 3 24 27 25 28 fi 1 fo rl i1 26 13 dt d ag c 20 2 2 21 vl c vo l u m e co n t r o l 1) t hes e t w o res i s t o r s depen d on t he s p e c i f i c m i c r oph one s e l e c t ed. 2) c o m pon e n t v a l u e s s how n ar e r e c o m m endat i ons onl y , a nd w i l l v a r y i n di f f e rent appl i c at i ons . 3) t h i s c a p a c i t o r m u s t be phy s i c a l l y adj a c ent t o p i n 4 of t he kk 34118. 4) b n m - b a c k ground n o i s e m oni t o r; d t d = d i al t one d e t e c t or . 5) r e c o m m e nded t r a n s f orm e r: s t anc or t t p c -13, m i c r ot ran t 5115 . 6) c a p a c i t o r v a l ues ar e i n f unl es s ot he rw i s e not ed. rl i 2 220 f 5. 0 f 47 f 120 k rl o 2 19 16 cp t 18 mu t tl o 2 12 mu t e 2. 0 f 100 k 2. 0 f 14 15 rx o rx i + 1 220 k 56 k 9. 1 k 5. 1 k 200 p f 1 10 k 10 k 0. 05 0. 1 4 3 1 6 7 kk 34119 kk 34118 8 5 25 s peak er (3 00 m w ) ? r r 20 k 10 k 0. 05 0. 1 cd tl o 1 2. 0 f 2. 0 f 100 k 47 f 470 0pf 470 0pf cp r rl o1 gn d 2 f ilt e r 23 7 6 tx i a t t enu at or a t t enu at or a t t enu at or co n t r o l bn m bn m 17 tl i 2 11 + + + + + + + + + + - - - - - - - - - - 5. 1 k 0. 02 180 k (n ot e1) mi k e 620 20 f v cc v b v b v b r hi v b v b v b v b v b v b v b v b v cc v cc c t v b v cc v cc v cc v b 220 f r mi r mf r hf 51k 220pf 13 KK34118
n s u f f i x p l as t i c d i p (m s - 0 0 1 a b ) sy m b o l m i n m a x a 3 5. 1 3 9. 7 b 1 2. 32 1 4 . 7 3 c6 d 0 .3 6 0 .5 6 f 0 .7 7 1 .7 8 g h j0 10 k 2 .9 2 5 .0 8 no t e s : l 1 5. 24 1 5 . 8 7 1. d i m e n s i o n s ?a ?, ?b ? d o n o t i n cl u d e m o l d f l as h o r p r o t r u s i o n s . m 0 . 2 0. 38 m a x i m u m m o l d f l a s h o r p r o t r u s i o n s 0. 25 m m ( 0 . 010) p e r s i d e . n0 . 3 8 d su f f i x so i c (m s - 0 5 9 a d) sy m b o l m i n m a x a 1 7. 7 1 8. 5 b 8 .2 3 8 .9 c 2 .3 5 3 .0 5 d 0 .3 5 0 .5 f 0 . 4 1. 27 g h no t e s : j0 8 1. d i m e ns i o ns a a n d b d o no t i n c l ud e m o l d f l a s h o r p r ot r u s i o n . k 0 .0 5 0 .3 5 2. m a x i m u m m o l d f l a s h o r p r o t r u s i o n 0. 15 m m ( 0 . 006) p e r s i d e m 0 .1 4 0 .3 2 fo r a ; fo r b ? 0. 25 m m ( 0 . 010) p e r s i d e . p 1 1. 5 1 2. 7 r 0 .2 5 0 .7 5 11 . 4 3 d i me n s i o n , mm d i me n s i o n , mm 2. 54 15 . 2 4 1. 27 . 3 5 a b c k c m j f m p h g d r x 45 se a t i n g pl a n e 0.2 5 (0. 0 10) m t -t - 1 28 14 15 l h m j a b f g d se a t i n g pl a n e n k 0.2 5 ( 0 . 010) m t -t - c 1 28 14 15 14 KK34118


▲Up To Search▲   

 
Price & Availability of KK34118

All Rights Reserved © IC-ON-LINE 2003 - 2022  

[Add Bookmark] [Contact Us] [Link exchange] [Privacy policy]
Mirror Sites :  [www.datasheet.hk]   [www.maxim4u.com]  [www.ic-on-line.cn] [www.ic-on-line.com] [www.ic-on-line.net] [www.alldatasheet.com.cn] [www.gdcy.com]  [www.gdcy.net]


 . . . . .
  We use cookies to deliver the best possible web experience and assist with our advertising efforts. By continuing to use this site, you consent to the use of cookies. For more information on cookies, please take a look at our Privacy Policy. X