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16 v 5 + 1-channel operational amplifier ADD8706 rev. 0 in fo rmation furn ished by an alog d e v i c e s is believed to be accurate and reliable. how e ver, n o resp on sibili ty is assume d b y a n alog de vices fo r its use, nor for an y i n fri n geme nt s of p a t e nt s or ot h e r ri ght s o f th ird parties th at may result fro m its use . s p ecificatio n s subj ec t to ch an g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot herwi s e u n der a n y p a t e nt or p a t e nt ri ghts of analog de v i ces. trademarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2003 analog de vices, i n c. al l r i ght s r e ser v ed . features single-supply operation: 4.5 v to 16.5 v upper/lower buffers swing to v s /gn d continuous output current: 35 ma v com peak outp ut current: 250 ma offset voltage: 15 mv slew rate: 6 v/ s unity gain st able with large capacitive loads supply current : 750 a per a m plifier applic ati o ns tft lcd monit o r panels tft lcd noteb ook panels communications equipment portable instrumentation electronic games adc/da c buff e r general description the ADD8706 is a sin g le-s u p p l y , 5-c h a n n e l b u f f er wi th a se pa ra t e v co m a m plif ier t h a t h a s b e e n o p t i mi ze d fo r t o d a y s lo w co st tf t lcd n o te b o ok an d m o n i to r p a n e ls. the to p and bot t om c h a n ne ls swin g t o t h e to p/bot t om ra ils, r e s p ec ti v e l y , and ca n b e us e d as e nd-p o in t gamm a r e fer e n c es. t h e midd le cha n n e ls a r e ide a l fo r mid p o i n t ga mma r e fer e n c es. th e v co m a m plif ier p r o v i d es v e r y hig h c o n t i n uo us a nd p e a k c u r r en ts. a l l ch an nel s h a v e e x c e l l e n t t r ans i e n t re sp ons e a s wel l a s h i g h sl e w ra t e and c a p a ci t i v e lo ad dr i v e c a p a b i li ty . th e ad d8706 is s p e c if ie d o v er t h e C40 c t o +8 5c t e m p er a t ure ra n g e . th e ad d8706 is a v a i la b l e in a 16-l e ad t sso p p a cka g e. tab l e 1. i n p u t outp ut characteristi c s c h a n n e l v ih v il i o (ma) i sc (ma) a v s gnd + 1.7 v 15 150 b v s C 1.7 v gnd 15 150 c v s C 1.7 v gnd 15 150 d v s C 1.7 v gnd 15 150 e v s C 1.7 v gnd 15 150 f v s C 1.7 v gnd 35 250 pin c o n f ig uratio n 1 2 3 4 5 6 7 16 15 14 13 12 11 10 ADD8706 +in f v+ +in e +in d out d +in c +in b +in a nc 89 ?in f out f v? out e out c out b out a 04352-0-001 nc = no connect f i g u re 1. 16-l e ad t ssop
ADD8706 rev. 0 | page 2 of 12 table of contents electrical characteristics ................................................................. 3 absolute maximum ratings ............................................................ 5 esd caution .................................................................................. 5 typical performance characteristics ............................................. 6 application information .................................................................. 9 theory .............................................................................................9 input/output characteristics ......................................................9 important note ..............................................................................9 outline dimensions ....................................................................... 11 ordering guide .......................................................................... 11 revision history revision 0: initial version
ADD8706 rev. 0 | page 3 of 12 electrical characteristics table 2. v s = 16 v, v cm = v s /2, t a @ 25 c, unless otherwise noted parameter symbol condition min typ max unit supply characteristics supply voltage v s 4.5 16 v power supply rejection ratio psrr v s = 4 v to 17 v, C40c t a +85c 70 90 db total supply current i sy v o = v s /2, no load 4.5 5.4 ma C40c t a +85c 6 ma input characteristics offset voltage v os 2 15 mv offset voltage drift ?v os /?t C40c t a +85c 10 v/c input bias current i b 400 1100 na C40c t a +85c 1500 na input offset current i os 10 100 na amplifier f C40c t a +85c 250 na common-mode rejection ratio cmrr C40c t a +85c amplifier f v cm = 0 to (v s C 1.7 v) 54 95 db input impedance z in 400 k? input capacitance c in 1 pf output characteristics output voltage high (a) v oh v in = 16 v, i l = 100 a 15.99 v optimized for high swing v in = 16 v, i l = 5 ma 15.75 15.85 v C40c t a +85c 15.65 v output voltage high (b to d) v oh v in = 14 v, i l = 100 a 14 v optimized for midrange v in = 14 v, i l = 5 ma 13.90 13.985 v C40c t a +85c 13.85 v output voltage high (e) v oh v in = 14 v, i l = 100 a 14 v optimized for low swing v in = 14 v, i l = 5 ma 13.9 13.99 v C40c t a +85c 13.85 v output voltage high (f) v oh v in = 16 v, i l = 100 a 15.995 v optimized for v com v in = 16 v, i l = 5 ma 15.8 15.9 v C40c t a +85c 15.75 v output voltage low (a) v ol v in = 1.7 v, i l = 100 a 1.70 v optimized for high swing v in = 1.7 v, i l = 5 ma 1.71 1.730 v C40c t a +85c 1.725 v output voltage low (bCd) v ol v in = 0 v, i l = 100 a 5 mv optimized for midrange v in = 0 v, i l = 5 ma 200 300 mv C40c t a +85c 350 mv output voltage low (e) v ol v in = 0 v, i l = 100 a 5 mv optimized for low swing v in = 0 v, i l = 5 ma 80 200 mv C40c t a +85c 300 mv output voltage low (f) v ol v in = 0 v, i l = 100 a 5 mv optimized for v com v in = 0 v, i l = 5 ma 50 150 mv C40c t a +85c 250 mv continuous output current (a to e) i out v s = 16 v 15 ma continuous output current (f) i out v s = 16 v 35 ma peak output current (a to e) i pk v s = 16 v 50 ma peak output current (f) i pk v s = 16 v 200 ma
ADD8706 rev. 0 | page 4 of 12 parameter symbol condition min typ max unit transfer characteristics amplifier gain a vo r l = 2 k?, v o = 0.5 to (v s C 2 v) 1 10 v/mv buffer gain a vcl r l = 2 k? 0.995 0.9985 1.005 v/v C40c t a +85c 0.995 0.9980 1.005 v/v buffer gain linearity nl r l = 2k?, v o = 0.5 to (v s C 0.5 v) 0.01 % dynamic performance slew rate sr r l = 2 k?, c l = 200 pf 4 6 v/s bandwidth bw C3 db, r l = 2 k?, c l = 40 pf 6 mhz phase margin ?o r l = 2 k?, c l = 40 pf 55 degrees channel separation 75 db noise performance voltage noise density e n f = 1 khz 26 nv/hz f = 10 khz 25 nv/hz current noise density i n f = 10 khz 0.8 pa/hz
ADD8706 rev. 0 | page 5 of 1 2 absolute maximum ratings table 3. add8 706 stress ratings* p a r a m e t e r r a t i n g supply voltage (v s ) 1 8 v input voltage ? 0.5 v to v s + 0.5 v differential input voltage v s storage temperature range C65c to +150c operating temperature range C40c to +85c junction tempe r ature range C65c to +150c lead temperature range 300c esd tolerance (hbm) 1500 v *s t r es s e s a b o v e t h os e lis t e d u n der a b s o l u t e m a xim u m r a t i n g s ma y c a us e p e r m a n en t dama ge t o t h e de vice . this is a s t r e s s ra t i n g onl y ; f u n c t i o n al o p era t ion o f t h e de vice a t t h es e o r an y o t h e r con d i t io ns a b o v e t h o s e i ndic a te d i n t h e op er a t io na l s e c t io n s o f t h is sp e c if ic a t ion is n o t i m plie d . e x p o sur e t o ab s o lute m a x i m u m r a t i ng c o nd it i o ns for e x te nd e d p e r i o d s m a y af fe c t d e v i c e rel i a b i l it y . table 4. packa g e characteristics package type ja 1 jc unit 16-lead tssop (ru) 180 35 c/w 1 ja is s p ecif ied f o r wors t-cas e c o nd itions , i.e., ja i s speci f i e d for d e vi ces sol d er ed on t o a ci rcui t boa r d for sur f a c e- m o un t pa cka g es. esd caution esd (elec t r o sta t i c dischar g e) sensitiv e devic e . ele c tr osta tic char g e s as high as 4000 v r e adily ac cumula t e on the human body and t e st eq uipmen t and can dis c har g e w i thout det e c t ion. al though this pr oduc t f e atur es pr oprietar y esd pr ot ec tion cir c uitr y , permanen t damage ma y oc cur on devic e s subjec ted to high ener gy elec tr o s ta tic dischar g e s . ther ef o r e , p r o p er esd pr ecaut i ons a r e r e c o m m ended to a v oid per f or m a nc e degrada t io n or los s of func tionalit y .
ADD8706 rev. 0 | page 6 of 1 2 typical perf orm ance cha r acte ristics input offset voltage (mv) quantity of amp l ifie rs ? 1 0 ? 8 ? 6 ? 4 ? 2 02468 0 10 20 30 40 50 60 70 10 04532-0-025 v s = 16v f i gure 2 . input o ffs et v o l t a g e , v s = 1 6 v tcvos ( v/c) quantity of amp l ifie rs 01 4 0 35 30 25 20 15 10 5 28 42 56 70 84 98 04352-0-026 v s = 16v f i gure 3. input o ffs et v o lt age d r if t, v s = 1 6 v temperature (c) inp u t bias curre nt (na) ?6 0 ?800 ?400 ?600 0 ?200 400 200 ? 4 0 ? 2 0 0 2 04 06 08 0 1 0 0 04352-0-027 a b f c d e v s = 16v f i gure 4. input bi as current v s . t e mpe r atur e temperature (c) inp u t offs e t curre n t (na) ?6 0 ? 4 0 0 4 2 6 8 18 12 14 16 10 ? 2 0 0 20 40 60 80 100 04352-0-028 v s = 16v f i gure 5. input o ffs et cur r ent v s . t e mper atu r e load current (ma) 10k 0.1 0.001 100 ? output voltage (mv) 0.01 0.1 1 1 0 1k 100 10 1 v s = 4.5v sink b, c, d e a f 04352-0-013 f i g u re 6. o u t p ut si nk v o lt ag e v s . l oad current , a l l ch ann e ls load current (ma) 10k 0.1 0.001 100 ? output voltage (mv) 0.01 0.1 1 1 0 1k 100 10 1 v s = 4.5v source = b, c, d, e a f 04352-0-015 f i g u re 7. o u t p ut s o ur c e v o lt ag e v s . l o ad cur r e n t , a l l ch a nnels
ADD8706 rev. 0 | page 7 of 1 2 load current (ma) 10k 0.1 0.001 100 ? output voltage (mv) 0.01 0.1 1 1 0 1k 100 10 1 v s = 16v sink e a f 04352-0-014 b, c, d f i g u re 8. o u t p ut si nk v o lt ag e v s . l oad current , a l l ch ann e ls load current (ma) 10k 0.1 0.001 100 ? output voltage (mv) 0.01 0.1 1 1 0 1k 100 10 1 v s = 16v source b, c, d, e a f 04352-0-016 f i g u re 9. o u t p ut s o ur c e v o lt ag e v s . l o ad cur r e n t , a l l ch a nnels s u p p l y curre nt p e r amp l ifie r (ma) supply voltage (v) 0.9 0 01 8 26 4 8 10 12 14 16 0.6 0.4 0.3 0.2 0.8 0.5 0.7 0.1 04352-0-022 f i gure 10. sup p l y current v s . sup p ly v o ltag e temperature (c) su pply c u r r e n t /a m p lifier ( m a ) ?60 0.69 0.71 0.70 0.74 0.73 0.72 0.75 0.76 ? 4 0 ? 2 0 0 2 04 06 08 0 1 0 0 04352-0-029 v s = 16v f i gure 11. sup p l y current v s . t e mper at ur e 120 0 1k 10k p o we r s u p p l y re j e ction ratio (db) 100k 1m 10m 60 40 20 100 80 v s = 16v +psrr ? psrr 100 04352-0-018 frequency (hz) fi g u r e 1 2 . p s r r v s . fr e q u e n c y frequency (hz) 140 0 1k 10k common-mode re j e ction (db) 100k 1m 10m 40 20 100 60 v s = 16v 100 120 80 04352-0-010 fi g u r e 1 3 . c m r r v s . fr e q u e n c y
ADD8706 rev. 0 | page 8 of 1 2 frequency (hz) ?2 0 1k 100m 10k gain ( d b) 100k 1m 10m 60 40 0 0 225 ph a se sh ift ( d egrees) 90 135 180 45 v s = 16v r l = 10k ? c l = 40pf 20 100 80 04352-0-012 fi g u r e 1 4 . fr e q u e n c y v s . g a i n a n d s h i f t frequency (hz) 100k 100m 1m gain ( d b) 10m 100 80 ? 100 60 40 20 0 ?20 ?40 ?60 ?80 vs = 16v rl = 10k ? 100pf 50pf 1040pf 540pf 04352-0-008 f i g u re 15. g a in v s . capa cit i ve l oad frequency (hz) 500 0 1k 10k imp e dance ( ? ) 100k 1m 10m 150 100 50 250 ch. a ? e 100 200 300 350 a v = 1 400 450 ch. f 04352-0-005 f i gure 16. impedan c e vs . f r eq uenc y capacitive load (pf) 10 1k 100 over sh oot ( % ) 100 90 0 80 70 60 50 40 30 20 10 v s = 16v v in = 100mv a v = 1 r l = 10k ? ?os +os 04352-0-020 f i gure 17. o v ersh o o t v s . capa citive l o ad time (1 s/div) volta ge ( 50mv/d i v) v s = 16v r l = 2k ? c l = 100pf = 04352-0-021 f i g u re 18. sm a ll-s i g n al t r ans i ent r e s p ons e time (1 s/div) volta ge ( 2 v/d i v) vs = 16v rl = 2k ? cl = 100pf = 04352-0-013 f i g u re 19. lar g e s i g n al t r ans i ent r e s p ons e
ADD8706 rev. 0 | page 9 of 1 2 application information theory the ADD8706 is desig n e d f o r us e in lcd ga mma co r r ec tio n cir c ui ts. this is a n ide a l on-chi p s o l u t i o n fo r lo w-e nd p a ne ls. i t prov i d e s f i ve g a mma vol t age s and a v co m o u t p u t . th es e ga mma v o l t a g es p r o v ide t h e r e fer e n c e v o l t a g es fo r t h e col u mn dr i v er rd a c s. due t o th e ca p a c i ti v e na t u r e o f l c d p a n e ls, i t is n e ce s s a r y fo r t h es e dr i v ers t o p r o v ide hig h c a p a ci t i v e lo ad dr i v e. the v co m o u t p ut is t h e c e n t er v o l t a g e co mm on t o al l t h e lcd pi x e l s . t h e v co m cir c ui t is co mm on t o al l the p i xe ls in the p a n e l . this r e q u ir es t h e v co m dr i v er t o s u p p l y co n t in u o us c u r r en ts u p t o 35 ma. inpu t/out p ut ch ara c teristics the ADD8706 has f i v e b u f f ers s p ecif ical l y desig n e d f o r th e n e e d s o f a n l c d p a ne l . f i gur e 20 s h o w s a typ i cal ga mma co rr ecti o n cur v e f o r a n o rm all y wh i t e tw is t e d n e m a ti c l c d p a n e l . th e sy mm et r i c c u r v e co m e s f r o m t h e ne e d t o r e vers e t h e p o la r i ty on t h e lc p i xels to a v oid b ur ning in t h e i m a g e. ther efo r e , t h e a p plica t io n r e q u i r es ga mma v o l t a g es t h a t com e c l os e t o bo th su p p l y ra ils. t o acco mm o d a t e this tra n sf er f u n c tion, th e f i ve ad d8706 b u f f ers ha v e be en desig n e d wi t h t h r e e dif f er en t b u f f er desig n s in o n e p a cka g e . gray scale bits gam m a voltage 01 6 3 2 4 8 6 4 v dd v g2 v g1 v g3 v g4 v g5 v g6 v g7 v g8 v g9 v g10 v ss 04352-0-003 f i gure 20. l c d g a mma corr ection cur v e the na t u r e o f lcd p a n e ls i n t r o d uces a l a rg e am o u n t o f p a rasi t i c c a p a ci t a n c e f r o m t h e c o l u mn dr i v ers as w e l l as t h e ca p a c i tan c e as s o cia t e d wi t h the liq u id cr ys tals v i a t h e comm on p l a n e . t h i s m a k e s c a pa ci ti v e d r i v e c a pa b i li t y a n i m po r t a n t fac t o r w h en desig n in g t h e gamma co r r e c t i o n c i r c ui t. the o u t p u t s o f t h e b u f f ers a nd am plif ier ha v e b e en desig n e d t o ma t c h t h e p e r f o r ma n c e n e e d s of t h e ga mma cor r e c t i o n a nd v co m cir c ui ts. a l l ha v e ra i l - t o-rai l o u t p uts, b u t t h e c u r r en t dr i v e ca p a b i li t i e s dif f er . th e dif f er ence in c u r r en t dr iv e a nd i n p u t v o l t a g e ra n g e de t e r m ine t h e b u f f er a n d am plif ie r us e . buf f er a has a n npn emi t t e r - fol l o w er in p u t s t ag e , w h ich p r o v ides a n in pu t ra n g e t h a t i n cl udes t h e t o p ra il , b u t is li mi t e d to 1 . 7 v a w a y f r om t h e b o ttom r a i l . i t i s de s i g n e d to s o u r c e 15 ma o f co n t in uo us c u r r en t, makin g this b u f f er ideal f o r p r o v idin g t h e t o p v o l t a g e on t h e rd a c st r i ng. buf f ers b , c, a n d d us e a si n g le -s u p pl y pnp i n p u t s t a g e wi t h an in t e r m e d ia t e comm on- m o d e vol t a g e ra n g e . the o u t p ut was desig n e d t o sin k o r s o ur ce u p to 15 ma o f co n t in uo us c u r r en t. the lim i te d i n pu t r a n g e and e q ui va len t si n k and s o ur ce c u r r en t mak e t h e s e b u f f ers s u i t a b le fo r t h e middle v o l t ag e ra n g es o n t h e rd a c s t r i ng. buf f er e als o uses a sin g le- s u p pl y p n p in p u t st a g e , b u t t h e o u t p u t is desig n ed t o sin k o n l y u p t o 15 ma o f co n t in uo us c u r r en t. this b u f f er is desig n e d fo r t h e rd a c s lo w e r ra n g e . am plif ier f is desig n e d wi t h a n in p u t ran g e lim i t e d t o mids ca le a p plic a t ion s . i t is ca p a b l e o f d e l i v e r i n g 35 m a o f co n t in uo us c u r r en t. th es e quali t ies ma k e a m plif ier f s u i t ab le fo r v co m ap p l i c at i o n s . important note b e ca us e o f t h e a s y m m e t r ic na t u r e o f buf f ers a a nd e, ca r e m u st be ta k e n t o co nn ect a n in p u t tha t f o r c e s th e a m p l i f i e r s t o o p era t e in t h e i r m o s t p r o d uc t i ve o u t p ut s t a t es. buf f er a has v e r y limi te d sink ca p a b i li t i es, w h i l e buf fer e do es n o t s o ur ce w e l l . s e t t h e buf f er a in pu t t o ena b le t h e a m plif ier o u t p ut t o s o ur ce c u r r en t a nd s e t t h e buf f er e in pu t t o fo r c e a sin k in g o u t p u t c u r r en t. this me a n s makin g s u r e t h e in p u t is ab o v e t h e m i dp oi n t of t h e c o m m o n - m o d e i n put r a nge f o r bu f f e r a and b e lo w t h e mi d p o i n t fo r buf f er e. m a t h ema t ica l l y s p e aking, ma k e sur e v in > v s /2 fo r buf f er a an d v in < v s /2 f o r b u ff e r e. f i gur e 21 s h o w s a n a p p l ic a t ion usin g th e ad d8706 t o g e n e r a te 1 0 g a m m a ou tp ut s . n o t e t h a t t h e f i ve output s ar e route d t h rou g h anot he r re s i stor ne t w o r k to ge ne r a t e t h e e x t r a f i ve o u t p ut v o l t a g es, w h ich fe e d i n t o t h e col u mn dr iv er .
ADD8706 rev. 0 | page 10 of 12 00000-x-000 gamma 2 gamma 3 gamma 4 gamma 5 gamma 6 gamma 7 gamma 8 gamma 9 gamma 10 column driver gamma 1 ADD8706 v com v dd v dd v com a b c d e f f i gur e 2 1 . ADD8706 a p pli c a t io n ci r c ui t
ADD8706 rev. 0 | page 11 of 12 outline dimensions 16 9 8 1 pin 1 seating plane 8 0 4.50 4.40 4.30 6.40 bsc 5.10 5.00 4.90 0.65 bsc 0.15 0.05 1.20 max 0.20 0.09 0.75 0.60 0.45 0.30 0.19 coplanarity 0.10 compliant to jedec standards mo-153ab f i gure 22. 1 6 -l ead thin shr i nk s m a l l o u tline p a ckage [ t ssop ] (ru) di me nsio ns sho w n i n mi ll im e t e r s ordering guide model 1 temperature r a nge package descri ption package option ADD8706aruz ? 40c to +85c 16-lead tssop ru-16 ADD8706aruz- reel ? 40c to +85c 16-lead tssop ru-16 1 z = pb-free part.
ADD8706 rev. 0 | page 12 of 12 notes ? 2003 analo g de vices, inc. all rights reserve d . tra d em arks and registered tra d ema r ks are the prop erty of their respective owners . c04352C0 C 10/03(0)

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