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60 db range (100 na to 100 a) low cost logarithmic converter adl5306 rev. 0 in fo rmation fur n ished by an al o g d e v i c e s is believed t o be accurate an d r e liable. how e ver, no r e spon sibili ty is assumed by anal og de vices fo r its use, nor for a n y i n fri n geme nt s of p a t e nt s or ot h e r ri g h t s o f th ird parties that m a y res u lt fro m its use . s p ecificatio n s subj ec t to chan ge witho u t n o tice. no licen s e is g r an te d b y implicatio n or ot h e rwi s e u n de r any p a t e nt or p a t e nt ri ght s of a n al og de vi c e s. tra d emark s a n d registered tra d ema r ks are the proper ty of th eir respectiv e co mpan ies. 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 optimiz e d for fiber optic phot od iod e interfac ing measures curr e n t over 3 deca des law conforma nce 0.1 db fro m 100 n a to 10 0 a single- or dual- s upply operati o n (3 v to 5 .5 v total) full log-ratio capabilities temperature s t able nominal slope of 10 mv/db (2 00 mv/deca d e) nominal interc ept of 1 na ( s et by external res istor) optional adjustment of slope and intercept rapid response time for a given current le ve l miniature 1 6 -le a d chip scale p a ckage (lfcsp 3 mm 3 mm) low power: ~5 ma qui e scent current applic ati o ns low cost optical power meas urement wide range baseband logarit h mic compress ion measurement of current and voltage ratios optical absorbance measure m ent gener a l description th e ad l530 6 ? is a lo w cost micr o m inia t u r e logar i t h mic co n v er ter o p t i mize d f o r determinin g o p t i ca l p o wer in f i b e r o p t i c sys t ems. th e ad l5306 is der i v e d f r o m t h e ad8304 a n d ad8305 t r a n s l in ea r logar i thmic co n v er t e rs. this fami l y o f de vices p r o v ides wide m e as ur em en t d y na mic r a n g e in a v e r s a t il e a n d e a s y -t o-use f o r m . a sin g le-s u p pl y v o l t a g e b etwe e n 3 v a n d 5.5 v is ade q ua te; d u a l s u p p lies ma y o p t i o n a l l y be use d . l o w q u iescen t curr en t (5 m a typ i ca l) p e rmi t s use in ba t t er y-o p era t e d a p p l ica t io n s . i pd , t h e 100 na t o 100 a in p u t curr en t a p pl ie d to t h e inpt p i n, is th e c o ll ect o r cu rr e n t o f a n o p ti m a ll y sc al ed n p n tr a n s i s t o r th a t co n v er ts t h is cu rr en t t o a v o l t a g e (v be ) w i th a p r ec i s e l o g a ri th m i c rel a t i o nsh i p . a s e cond c o n v e r ter is u s e d to h a nd l e t h e re fere nce cur r en t, i ref , a p p l ie d to iref . th es e in p u t n o des ar e b i as e d s l ig h t ly ab o v e g r o u n d (0. 5 v). this is g e n e ral l y accep t ab le f o r pho t o diode a p p l i c a t i o n s wh er e th e a n od e d o e s n o t n eed t o be gr o u n d ed . s i mi la rl y , t h is b i as v o l t a g e is e a si l y acco un te d f o r in g e n e ra t i n g i ref . th e loga r i t h m i c f r o n t en d s o u t p u t is a v a i la b l e a t vl o g . th e b a sic loga r i thmic s l o p e a t t h i s o u t p u t is 200 mv/de c ade (10 mv/db) n o mina l; a 60 db ra n g e co r r es p o n d s to a 600 mv o u t p u t c h a n g e . w h en t h is v o l t a g e (o r t h e b u f f er o u t p u t ) is a p p l ie d t o a n ad c tha t p e rmi t s a n ex t e r na l r e f e r e n c e v o l t a g e t o be em plo y e d , t h e ad l5306 s 2.5 v vo l t a g e r e f e r e n c e o u t p u t a t vre f can b e us e d to i m p r o v e s c a l in g accurac y . func tio n a l block di agram temperature compensation bias generator 451 ? 14.2k ? 80k ? 20k ? r ref 200k ? 6.69k ? comm comm comm vneg vsum vpos inpt vref nc iref 0.5v +5v 2.5v 0.5v v be1 i log v be2 vout scal bfin vlog 03727-0-001 0.2 log 10 ( ) i pd 1na 1k ? 1k ? 1nf 1nf 1nf v bias i pd q2 q1 f i gur e 1 . f u nctio n al bl oc k dia g r a m th e loga r i t h m i c in t e r c ep t (r ef er e n ce cur r en t) is n o mina l l y p o si t i o n e d a t 1 n a b y usin g t h e exter nal l y g e n e ra t e d , 100 a i ref cur r en t p r o v ide d b y a 200 k? r e s i s t o r co nn e c te d b etween vref , a t 2.5 v , a n d ire f , a t 0.5 v . th e in ter c ep t ca n b e ad j u s t e d o v er a na r r o w ra n g e b y va r y in g t h is r e sis t o r . th e p a r t ca n a l s o o p era t e in a lo g-ra t i o m o de , wi t h limi t e d ac curac y , w h e r e t h e n u m e ra t o r a n d den o mina to r cur r en ts ar e a p plie d to inpt an d i r e f , r e s p e c t i v e ly . a b u f f er am p l if i e r is p r o v ide d to dr i v e s u bs t a n t ia l loads, raise t h e b a sic 10 mv/db s l o p e, s e r v e as a p r e c isio n co m p ara t o r (t hr es h o ld det e ct o r ), o r im p l em en t lo w- p a s s f i l t er s. i t s ra il-t o-ra il o u t p u t s t a g e ca n swin g to wi t h in 100 mv o f t h e p o si t i v e a n d nega t i v e s u p p l y ra i l s, a n d i t s p e ak cur r en t-s o ur cin g ca p a ci ty is 25 ma. a f u ndame n t a l asp e c t o f t r ansl ine a r l o gar i t h m i c co n v e r ters is t h a t smal l-sig n a l b a n d wid t h fa l l s as curr en t le v e l dimi n is h e s, a n d lo w f r e q uen c y n o is e-s p e c t r a l d e n s i t y i n cr e a s e s. a t t h e 100 na le v e l , t h e ad l5306 s b a n d wid t h is a b o u t 100 kh z; i t i n cr e a s e s in p r o p o r t i o n to i pd u p t o a ma xim u m o f a b o u t 10 mh z. th e in cr e a s e in n o is e le v e l a t lo w curr en ts can b e addr es s e d b y usin g a b u f f er am plif ier to r e alize lo w-p a s s f i l t er s o f u p t o t h r e e p o les. th e ad l530 6 is a v a i la b l e in a 16-le ad lfcs p p a c k a g e a n d is s p e c if ie d f o r o p era t io n f r o m C40 c to +85 c. ? protected by us patents 4,604,532 an d 5,519,308; other patents pending.
adl5306 rev. 0 | page 2 of 1 6 table of contents specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 pin configuration and pin function descriptions ...................... 5 typical performance characteristics ............................................. 6 general structure .............................................................................. 9 theory ............................................................................................ 9 managing intercept and slope .................................................. 10 response time and noise considerations ............................. 10 applications ..................................................................................... 11 using a negative supply ............................................................ 11 characterization methods ........................................................ 12 evaluation board ............................................................................ 14 outline dimensions ....................................................................... 16 ordering guide .......................................................................... 16 revision history rev. 0: initial version
adl5306 rev. 0 | page 3 of 16 specifications table 1. v p = 5 v, v n = 0, t a = 25 c, r ref = 200 k?, unless otherwise noted parameter conditions min 1 typ max 1 unit input interface inpt (pin 4), iref (pin 3) specified current range, i pd flows toward inpt pin 100n 100 a input current min/max limits flow s toward inpt pin 1 ma reference current, i ref , range flows toward iref pin 100n 100 a summing node voltage internally preset; may be altered by user 0.46 0.5 0.54 v temperature drift C40 c < t a < +85 c 0.015 mv/ c input offset voltage v in C v sum , v iref C v sum C20 +20 mv logarithmic output vlog (pin 9) 190 200 210 mv/dec logarithmic slope C40 c < t a < +85 c 185 215 mv/dec 0.3 1 1.7 na logarithmic intercept 2 C40 c < t a < +85 c 0.1 2.5 na law conformance error 100 na < i pd < 100 a 0.1 0.4 db wideband noise 3 i pd > 1 a 0.7 v/hz small-signal bandwidth 3 i pd > 1 a 0.7 mhz maximum output voltage 1.7 v minimum output voltage limited by v n = 0 v 0.01 v output resistance 4.375 5 5.625 k? reference output vref (pin 2) 2.435 2.5 2.565 v voltage wrt ground C40 c < t a < +85 c 2.4 2.6 v maximum output current sourcing (grounded load) 20 ma incremental output resistance load current < 10 ma 2 ? output buffer bfin (pin 10); scal (p in 11); vout (pin 12) input offset voltage C20 +20 mv input bias current flowing out of pin 10 or pin 11 0.4 a incremental input resistance 35 m? output range r l = 1 k? to ground v p C 0.1 v incremental output resistance load current < 10 ma 0.5 ? peak source/sink current 50 ma small-signal bandwidth gain = 1 15 mhz slew rate 0.2 v to 4.8 v output swing 15 v/s power supply vpos (pin 8); vneg (pin 6) positive supply voltage (v p C v n ) 11 v 3 5 5.5 v quiescent current 5.4 6.6 ma negative supply voltage (optional) (v p C v n ) 11 v C5.5 0 v 1 minimum and maximum specified limits on parameters that are guaranteed but not tested are six sigma values. 2 other values of logarithmic intercept can be achieved by adjusting r ref . 3 output noise and incremental ba ndwidth are functions of input current measured using the output buffer connected for gain = 1.
adl5306 absolute maximum ratings table 2. adl5 306 absolute maximum ratings p a r a m e t e r r a t i n g supply voltage v p C v n 12 v input current 20 ma internal power dissipation 500 mw ja 1 3 5 c / w maximum junction temperature 125c operating temperature range C40c to +85c storage temperature range C65c to +150c lead temperature range (soldering 60 sec) 300c s t r e s s es a b o v e t h os e lis t e d u n de r a b s o l u t e m a xi m 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 o f t h is sp e c if ic a t io n is no t im plie d . e x p o sur e t o a b s o l u te max i m u m ra t i ng co ndi t i on s fo r ex ten d e d p e r i o d s ma y a f fe c t de vice r e l i ab i l i t y . rev. 0 | page 4 of 1 6
adl5306 pin conf iguration and pi n function descriptions nc inpt vref iref scal bfin comm comm comm vpos comm vneg vneg vsum vout vlog 1 2 3 4 56 7 8 9 10 11 12 13 14 15 16 adl5306 03727-0-002 f i g u re 2. 16-l e ad l e adf r am e ch ip s c a l e p a ck ag e (lfcs p ) ta ble 3. pi n f u nct i on d e s c ri pt i o ns pin no. mnemonic function 1 n c n / a 2 vref reference output voltage of 2.5 v. 3 iref accepts (sinks) reference current i ref . 4 i n p t accepts (sinks) photodiode current i pd . usually connected to photodiode an od e such that photocurrent flows into inpt. 5 vsum guard pin. used to shield the inpt current line and for optional adjustment of the inpt and i r e f node potential. 6, 7 vneg optional negative supply, v n . this pin i s usually grounded; for details of usage, see the applicati o ns se ction. 8 vpos positive supply, ( v p C v n ) 11 v. 9 vlog output of the l o garithmic front end. 10 bfin buffer amplifier noninverting input. 11 scal buffer amplifier inverting input. 12 vout buffer output. 1 3 C 1 6 c o m m analog ground. rev. 0 | page 5 of 1 6
adl5306 rev. 0 | page 6 of 1 6 typical perf orm ance cha r acte ristics (v p = 5 v , v n = 0 v , r re f = 200 k ? , t a = 2 5 c, unless otherwis e noted.) 0 0.2 0.4 0.6 0.8 1.0 1.2 10n 100n 1 10 100 1m i pd (a) v log (v ) 03727-0-003 t a = ? 40c, 0c, +25 c, +70c, +85 c v n = 0v fi g u r e 3 . v lo g vs . i pd f o r m u lt ip le t e mpe r at ures 0 0.2 0.4 0.6 0.8 1.0 1.4 1.2 10n 100n 1 10 100 1m i ref (a) v log (v ) 03727-0-004 t a = ? 40c, 0 c, +25c, +70 c, +85c v n = 0v fi g u r e 4 . v lo g vs . i re f f o r m u lt ipl e t e mper at u r es 0 0.2 0.4 0.6 0.8 1.0 1.6 1.4 1.2 10n 100n 1 10 100 1m i pd (a) v log (v ) 03727-0-005 100na 1 a 10 a 100 a fi g u r e 5 . v lo g vs . i pd f o r m u lt ip le v a l u es of i re f (d ec ade steps f r o m 10 na to 1 ma ) ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 10n 100n 1 10 100 1m i pd (a) e rror (db (1 0 m v / db)) 03727-0-006 t a = ? 40c, 0c, +25 c, +70c, +85 c v n = 0v ?40 c +25 c +70c +85c 0 c f i gure 6. law conf or manc e er ror vs. i pd (i ref = 1 0 a ) f o r m u lt ipl e t e m p er atures, no r m a l i z ed to 2 5 c ?1.5 ?1.0 ?0.5 0 0.5 1.0 1.5 10n 100n 1 10 100 1m i ref (a) e rror (db (1 0 m v / db)) 03727-0-007 t a = ? 40c, 0c, +25 c, +70c, +85 c v n = 0v ?40 c +25 c +70 c +85c 0c f i gure 7. law conf or manc e er ror vs. i re f (i pd = 10 a ) f o r m u lt ipl e t e m p er atures, no r m a l i z ed to 2 5 c ?0.3 ?0.2 ?0.1 0 0.1 0.2 0.3 10n 100n 1 10 100 1m i pd (a) e rror (db (1 0 m v / db)) 03727-0-008 100na 1 a 10 a 100 a f i gure 8. law conf or manc e er ror vs. i pd f o r m u lt ip le v a lu e s of i ref (d ec ade steps f r o m 10 na to 1 ma )
adl5306 0 0.2 0.4 0.6 0.8 1.0 1.6 1.4 1.2 10n 100n 1 10 100 1m i ref (a) v log (v ) 03727-0-009 100na 1 a 10 a 100 a fi g u r e 9 . v lo g vs . i re f f o r m u lt ipl e v a lu e s of i pd (d ec ade steps f r o m 10 na to 1 ma ) ?0.3 ?0.2 ?0.1 0 0.1 0.2 0.3 10n 100n 1 10 100 1m i pd (a) e rror (db (1 0 m v / db)) 03727-0-010 +3v, ?0.5v +3v, 0v +5v, ? 5 v +5v, 0v f i gure 10. law con f orm a nce e r r o r v s . i pd f o r v a r i o u s sup p l y condit ions ?3 ?4 ?2 ?1 0 2 1 4 3 10n 100n 1 10 100 1m i pd (a) e rror (db (1 0 m v / db)) 03727-0-011 mean ? 3 @ ? 40c mean + 3 @ ? 40c mean 3 @ +85c t a = ? 40c, +85 c f i g u re 11. v in pt C v sum vs . i pd ?0.3 ?0.2 ?0.1 0 0.1 0.2 0.3 10n 100n 1 10 100 1m i ref (a) e rror (db) 03727-0-012 100na 1 a 10 a 100 a f i gure 12. law con f orm a nce e r r o r v s . i ref f o r m u lt ipl e v a lu es of i pd (d ec ade steps f r o m 10 na to 1 ma ) 0 0.2 0.4 0.6 0.8 1.0 1.2 ? 2 0 0 20 40 60 80 100 120 140 160 180 time ( s) v out (v ) 03727-0-013 10 a to 100 a: t rise < 1 s, t fall < 1 s 1 a to 10 a: t rise < 1 s, t fall < 5 s 100na to 1 a: t rise < 5 s, t fall < 20 s f i gur e 1 3 . p u l s e r e sp o n se: i pd to v ou t (g = 1) ? 2 0 0 20 40 60 80 100 120 140 160 180 0 0.2 0.4 0.8 1.0 1.2 1.4 0.6 time ( s) v out (v ) 03727-0-014 100na to 1 a: t rise = 30 s, t fall = 5 s 1 a to 10 a: t rise = 5 s, t fall < 1 s 10 a to 100 a: t rise = 1 s, t fall < 1 s f i gur e 1 4 . p u l s e r e sp o n se: i ref to v ou t (g = 1) rev. 0 | page 7 of 1 6
adl5306 frequency (hz) n o r m a l ized r espon se ( d b ) ?40 ?35 ?30 ?25 ?20 ?15 ?10 ?5 0 10 5 10 0k 10 k 1k 10 0 1 m 10m 100m 03727-0-015 100na 1 a 10 a 100 a f i gure 15. sm a ll-s i gnal a c response ( 5 % s i ne m o du lat i o n ), fr o m i pd to v ou t (g = 1) f o r i pd i n dec a de s t e p s fr om 1 0 n a t o 1 m a frequency (hz) n o r m a l ized r espon se ( d b ) ?40 ?35 ?30 ?25 ?20 ?15 ?10 ?5 0 10 5 10 0k 10 k 1k 10 0 1 m 10m 100m 03727-0-016 100na 1 a 10 a 100 a f i gure 16. sm a ll-s i gnal a c response ( 5 % s i ne m o du lat i o n ), fr o m i ref to v ou t (g = 1) f o r i ref i n dec a de s t e p s fr om 1 0 n a t o 1 m a 0.01 0.1 1 10 100 100 1k 10k 100k 1m 10m frequency (hz) vrms/ hz 03727-0-017 100na 1 a 10 a 100 a f i g u re 17. spot no i s e spec t r al d e ns it y at v ou t (g = 1) v s . f r eq u e n c y fo r i pd i n d e c a de ste p s fr om 1 0 n a to 1 m a frequency (hz) n o r m a l ized r espon se ( d b ) ?25 ?20 ?15 ?10 ?5 0 5 100k 10 k 1 m 10m 100m 03727-0-018 av = 5 av = 2.5 av = 2 av = 1 f i gure 18. sm a ll-s i gnal a c r e s p ons e of the buffe r fo r v a ri ous closed-l oop g a ins (r l = 1 k ? , c l < 2 p f ) ?40 ? 30 ?20 ? 10 0 2 0 6 0 10 30 40 50 70 80 90 ? 2.0 ? 1.0 0 1.0 1.5 2.0 ? 1.5 ? 0.5 0.5 temperature ( c) v os drift (mv ) 03727-0-019 mean + 3 mean ? 3 f i gure 1 9 . buffer input o ffset dri f t vs . t e mp er a t ure (3 to e i th er s i de o f mean) 0 1 2 3 4 5 6 10n 100n 1 10 100 1m i pd (a) mvrms 03727-0-020 f i gure 20. t o t a l wi deband no ise v o lt age at v ou t vs . i pd (g = 1) rev. 0 | page 8 of 1 6
adl5306 gene ral structure the ad l5306 addr es s e s a wide va r i ety o f in t e r f acin g con d i t io ns to me e t t h e ne e d s of f i b e r opt i c sup e r v i s or y s y ste m s , a n d i s us ef u l in man y n o n o p t i c a l a p pl ica t ion s . this s e c t io n expla i n s t h e s t r u c t ur e o f t h is uniq ue sty l e o f t r a n s l i n e a r log a m p . th e sim p lif i ed s c h e ma tic in f i gur e 21 s h o w s t h e k e y e l em en ts. q2 q1 451 ? 14.2k ? 80k ? 20k ? 6.69k ? photodiode input current bias generator temperature compensation (subtract and divide by tk) 2.5v comm comm vlog vneg (normally grounded) vsum inpt vref iref i ref v be1 v be2 i pd v be1 v be2 44 a/dec 2.5v 0.5v 0.5v 0.5v 03727-0-021 f i g u re 21. si mpl i f i e d s c h e m a t i c the ph o t o d io de c u r r en t i pd is r e cei v e d a t pin i n pt . the v o l t a g e a t t h is n o d e is e s s e n t ia l l y e q ua l t o t h e v o l t a g e on t h e tw o ad jace n t gu a r d p i n s , v s u m and iref , d u e t o t h e lo w o f fs et v o l t a g e o f the jfet o p a m p . t r an sis t o r q1 co n v er ts i pd to a co r r es p o n d in g l o ga r i thmic v o l t a g e , as sh o w n in e q ua tion 1. a fi n i t e p o s i t i v e v a l u e o f v su m i s n eed e d t o b i a s t h e co ll ect o r o f q 1 fo r t h e usua l c a s e o f a sin g le-su pply v o l t a g e . this is in t e r n a l ly s e t t o 0.5 v , on e f i f t h o f th e 2.5 v r e f e r e n c e v o l t a g e a p p e a r in g on pin vref . t h e resist a n ce a t t h e v s u m p i n is n o mina l l y 16 k? ; t h is v o l t a g e is no t in te n d e d as a gen e ra l b i as s o ur ce . the ad l5306 a l s o s u p p o r ts th e us e o f a n o p tional nega t i v e su p p ly vol t age, v n , a t p i n v n e g . w h e n v n is C0.5 v o r m o r e n e g a t i ve, v s u m ma y b e co n n e c te d to g r o u n d ; t h us, inpt a nd iref as s u m e this p o t e n t ia l . this al lo ws o p era t io n as a v o l t a g e- in p u t loga r i t h mic co n v er t e r b y t h e i n cl usio n o f a s e r i es r e sis t o r a t ei th e r o r bo th i n p u ts. n o t e th a t t h e r e si s t o r set t i n g, i ref , w i l l ne e d to b e a d j u s t e d to m a i n t a i n t h e i n te rc e p t v a lu e. i t shou l d a l s o b e note d t h a t t h e c o l l e c tor - e m it te r volt age s of q 1 and q 2 a r e n o w t h e f u l l v n , a nd ef fe c t s d u e t o s e lf -he a t i n g w i l l ca us e er r o rs a t la rg e in p u t c u r r en ts. the i n p u t - dep e n d e n t v be1 o f q 1 is co m p a r ed wi t h t h e r e f e r e nce v be2 of a s e c o n d t r ans i stor , q 2 , op e r a t i n g at i ref . this is ge ne r a te d e x te r n a l ly to a re c o m m e n d e d v a lu e of 1 0 a . h o w e v e r , o t h e r val u es o v er a se v e ral-d e cad e ran g e can be used wi t h a slig h t de g r ada t io n i n l a w co nfo r ma n c e (s e e f i gur e 8). theory t h e b a s e - e m i t t e r volt age of a b j t ( b i p ol ar j u nc t i on t r ans i stor ) ca n b e exp r es s e d b y t h e fol l o w i n g e q u a t i on, w h ich imme dia t e l y s h o w s i t s basic l o ga r i thmic na t u r e : v be = kt / q ln( i c / i s ) ( 1 ) w h er e: i c is t h e col l e c t o r c u r r en t i s is a s c a l i n g c u r r en t, typ i ca l l y o n ly 10 C17 a kt / q i s th e th e r m a l v o l t a g e , p r o p o r t i o n a l t o a b so l u t e t e m p era t ur e (pt a t), and is 25. 85 mv a t 300 k. i s is ne ver p r e c is ely def i n e d a nd ex hib i ts a n e v en st r o n g er tem p er a t ur e de p e nde n c e, va r y i n g b y a fac t o r o f r o ug h l y a b i l l io n betw een C35c and +85c. th us, t o ma k e us e o f th e bj t as a n acc u r a t e l o ga r i t h mic e l em e n t, b o t h o f t h es e t e m p era t ur e - dep e n d e n cies m u st b e elimi n a t e d . the dif f er ence b e tw e e n t h e b a s e -emi t t e r v o l t a g es o f a ma t c h e d p a i r of b j t s , on e op e r a t i n g a t t h e p h ot o d i o d e c u r r e n t i pd and t h e o t h e r o p er a t in g a t a r e fer e n c e c u r r en t i ref , can b e wr i t ten as v be 1 C v be 2 = kt / q ln( i pd / i s ) C kt / q ln ( i ref / i s ) = ln(10) kt/ q log 10 ( i pd / i ref ) ( 2 ) = 59.5 mv log 10 ( i pd / i ref ) ( t = 300 k ) the u n cer t a i n, tem p er a t ur e - dep e n d e n t s a t u ra t i on c u r r en t, i s , t h a t a p p e a r s i n e q ua t i on 1 has t h er efo r e b e en e l imina t e d . t o e l imina t e t h e t e m p er a t ur e va r i a t io n o f kt / q , t h i s dif f er en ce v o l t a g e is p r o c e s s e d b y w h a t is ess e n t ia l l y a n ana l og di vi der . ef f e c t i v e l y , i t p u ts a va r i ab le u nder e q ua t i o n 2. the o u t p u t o f t h is p r o c ess, w h ich a l s o in v o lv es a con v ersio n f r o m v o l t a g e mo d e to c u r r e n t mo de, i s a n i n t e r m e d i a te, te m p e r a t u r e - c o rr ect e d cu rr e n t : i lo g = i y log 10 ( i pd / i ref ) ( 3 ) w h er e i y i s an a c c u r a te, te m p e r a t u r e - st a b l e s c a l i n g c u r r e n t t h a t det e r m i n es t h e s l o p e o f t h e f u nc t i o n (cha n g e i n c u r r en t p e r decade). f o r th e ad l5306, i y is 44 a, r e su l t in g in a t e m p era t ur e-i ndep e n d e n t s l op e o f 44 a / de ca de fo r a l l va l u es of i pd and i ref . this c u r r en t is subs e q ue n t ly co n v er t e d b a ck t o a vol t age - mo de out p ut , v lo g , s c al ed 200 mv/dec ade . rev. 0 | page 9 of 1 6
adl5306 rev. 0 | page 10 of 16 it is apparent that this output should be zero for i pd = i ref , and would need to swing negative for smaller values of input current. to avoid this, i ref would need to be as small as the smallest value of i pd . in the adl5306, an internal offset voltage is added to v log to shift it upward by 0.8 v. this moves the intercept to the left by four decades, from 10 a to 1 na: i log = i y log 10 ( i pd / i intc ) (4) where i intc is the operational / value of the intercept current. since values of i pd < i intc result in a negative v log , a negative supply of sufficient value is required to accommodate this situation (discussed later). the voltage v log is generated by applying i log to an internal resistance of 4.55 k?, formed by the parallel combination of a 6.69 k? resistor to ground and the 14.2 k? resistor to the internal 2.5 v reference. at the vlog pin, the output current i log generates a voltage of v log = i log 4.55 k? = 44 a 4.55 k? log 10 ( i pd / i ref ) (5) = v y log 10 ( i pd / i ref ) where v y = 200 mv/decade or 10 mv/db. note that any resistive loading on vlog will lower this slope and will result in an overall scaling uncertainty due to the variability of the on- chip resistors. consequently, this practice is not recommended. v log may also swing below ground when dual supplies (v p and v n ) are used. when v n = - 0.5 v or more negative, the input pins inpt and iref may be positioned at ground level simply by grounding vsum. managing intercept and slope as previously noted, the internally generated 2.5 v bias combines with the on-chip resistors to introduce an accurate offset voltage of 0.8 v at the vlog pin, equivalent to four decades. this results in a logarithmic transfer function that can be written as v log = v y log 10 (10 4 i pd / i ref )= v y log 10 ( i pd / i intc ) (6) where i intc = i ref /10 4 thus, the effective intercept current, i intc , is only one ten- thousandth of i ref , corresponding to 10 na when using the recommended value of i ref = 100 a. the slope can be reduced by attaching a resistor to the vlog pin. this is strongly discouraged because the on-chip resistors will not ratio correctly to the added resistance. also, it is rare that one would wish to lower the basic slope of 10 mv/db; if this is necessary, it should be done at the low impedance output of the buffer, which is provided to avoid such miscalibration and allow higher slopes to be used. the adl5306 buffer is essentially an uncommitted op amp with rail-to-rail output swing, good load driving capabilities, and a unity-gain bandwidth of >20 mhz. in addition to allowing the introduction of gain using standard feedback networks, thereby increasing the slope voltage, v y , the buffer can be used to implement multipole low-pass filters, threshold detectors, and a variety of other functions. for more details, see the ad8304 data sheet. response time and noise considerations the response time and output noise of the adl5306 are fundamentally a function of the signal current i pd . for small currents, the bandwidth is proportional to i pd . the outputs low frequency voltage-noise spectral density is a function of i pd , and increases for small values of i ref . for details of noise and bandwidth performance of translinear log amps, see the ad8304 data sheet.
adl5306 rev. 0 | page 11 of 16 appli c ations the ad l5306 is easy t o us e in o p tical s u p e r v is o r y sys t em s a n d in simi la r si t u a t io n s w h er e a wi de-ra n g i n g c u r r en t is t o b e co n v er t e d t o i t s loga r i t h mic e q ui valen t ( i .e ., r e p r es en t e d i n de cibel t e r m s). b a sic co nn e c tion s fo r m e as ur ing a sin g le c u r r en t in p u t a r e sh o w n in f i gur e 22, w h ich i n cl udes v a r i o u s no ne ss e n t i a l c o m p o n e n t s , a s w i l l b e e x pl a i n e d. temperature compensation bias generator 451 ? ? ? ? ? ? ? ? ? ? f i gure 22. bas i c connec t ions for f i x e d interc ept use the 2 v dif f er e n ce in v o l t a g e b e tw e e n vref and inp t , i n co n j u n c t io n wi t h the ext e r n al 200 k? r e sis t o r r ref , p r o v i d e s a re f e re nc e c u r r e n t i ref o f 100 a in t o p i n iref . th e in t e r n al r e fer e n c e ra is es t h e v o l t a g e a t v l o g b y 0.8 v , ef fe c t i v e l y lo w e r i n g t h e in ter c ep t c u r r en t i in t c by a f a c t or of 1 0 4 to p o s i t i on i t a t 1 na. an y tem p er a t ur e v a r i a t io n in r ref mu s t b e t a ke n i n t o acco un t w h en e s t i ma t i n g t h e s t a b i l i t y o f t h e in ter c ep t. a l s o , t h e o v era l l n o is e wi l l in cr e a s e w h e n usin g v e r y lo w va l u es o f i ref . i n f i xe d-in t e r c ep t a p plic a t ion s , t h e r e is li t t le b e n e f i t in usin g a la rge r e fer e n c e c u r r en t, si n c e t h is on l y co m p r e s s es t h e lo w c u r r en t e n d of t h e dy n a m i c r a nge w h e n op e r a t e d f r om a s i ng l e supply , sh own h e r e as 5 v . the c a p a ci tor b e twe e n v s u m a nd g r o u nd i s re c o m m e nd e d t o m i n i m i z e t h e noi s e o n t h i s no d e a n d to h e lp p r o v ide a cle a n r e fer e n c e c u r r en t. s i n c e t h e basic s c alin g a t vlo g is 0.2 v/dec and a s w in g o f 4 v a t t h e b u f f er o u t p u t w o u l d t h er e f o r e co r r es p o n d t o 20 de cades, i t wi l l o f t e n b e us ef u l t o ra is e t h e s l op e t o ma k e b e t t er us e o f t h e ra il-t o-ra il v o l t ag e ra n g e . f o r ill u s t ra ti v e p u r p oses, th e cir c ui t in f i gur e 22 p r o v ides a n o v eral l s l o p e o f 0.5 v/de c (25 mv/db). th us, usin g i ref = 100 a, v lo g r u n s f r o m 0.2 v a t i pd = 100 na t o 0.8 v a t i pd = 100 a. the b u f f er o u t p u t r u n s f r o m 0.5 v t o 2.0 v , co r r es p o ndin g t o a d y namic ra n g e o f 60 db e l ec tr ical (30 db o p tical) p o w e r . t h e opt i on a l c a p a c i tor f r om v l o g to g r ou nd f o r m s a s i ng l e - p o le lo w-p a s s f i l t er in com b ina t io n wi t h the 4.5 5 k? r e sis t a n ce a t t h is pin. f o r ex am pl e, u s ing a c fl t o f 10 nf , th e C3 db co r n er f r e q uen c y is 3.2 khz. s u ch f i l t er in g is us ef u l in mini miz i n g t h e o u t p u t n o is e , p a r t ic u l a r l y wh en i pd is smal l . m u l t i p ole f i l t ers a r e m o r e ef fe c t i v e in r e d u cing t h e to t a l n o i s e . f o r exa m ples, s e e t h e ad8304 d a ta sh eet. the d y n a mic r e sp o n s e o f t h is o v era l l in p u t sy stem is inf l ue n c e d b y t h e ex ter n a l rc netw o r ks conn e c te d f r o m t h e tw o in p u ts (inp t , iref) t o g r o u n d . th es e a r e r e q u ir ed t o s t a b ilize t h e in p u t sys t ems o v er t h e f u l l c u r r en t ra n g e . th e b a ndwid t h cha n g e s wi t h t h e in p u t c u r r en t d u e t o t h e wide ly va r y in g p o le f r e q uen c y . t h e rc netw o r k ad ds a z e r o t o t h e in p u t sy st e m t o en s u r e s t ab i l i t y o v er t h e f u l l ra n g e o f in p u t c u r r en t le ve ls. th e n e t w o r k val u e s s h o w n in f i g u r e 2 2 w i ll u s u a ll y s u f f i c e , b u t so m e exp e r i m e n t a t ion ma y b e n e ce s s a r y w h en t h e ph o t o d io de s ca p a c i tan c e is hig h . al th o u g h th e tw o curr e n t i n p u t s a r e si m i la r , so m e ca r e i s n e e d e d t o o p era t e t h e r e fer e n c e in p u t a t ext r e m es o f c u rr en t (<100 na) and tem p er a t ur e (<0 c). m o dif y in g th e rc netw o r k t o 4.7 nf an d 2 k wil l al lo w op era t ion t o C40c a t 10 na. b y in s p e c tin g t h e t r a n sien t r e sp o n s e t o p e r t urb a tio n s in i ref at r e p r es en t a t i v e c u r r en t le v e l s, t h e ca p a c i t o r val u e can b e ad j u st e d t o p r o v ide fast r i s e an d fal l tim e s wi th accep t a b l e s e t t lin g . t o f i n e - t u n e t h e n e tw o r k zer o , t h e r e sis t o r val u e s h o u ld b e ad j u st e d . using a negative supply m o s t a p p l ic a t ion s o f th e ad l5 306 r e q u ir e o n ly a sin g le s u p p ly o f 3.0 v t o 5.5 v . h o w e v e r , t o p r o v ide f u r t h e r v e rs a t ili t y , d u a l s u p p lies ma y b e em plo y e d , as il l u s t ra t e d in f i gur e 23. temperature compensation bias generator 451 ? ? ? ? ? ? ? ? ? ? f i g u r e 2 3 . n e ga t i v e s u pp l y appl ic a t i o n
adl5306 rev. 0 | page 12 of 16 the us e o f a n e ga t i ve su p p ly , v n , a l l o w s t h e su m m i ng no d e to b e p l a c e d a t gr o u n d l e v e l w h en ev er th e in p u t tra n s i s t o r (q1 i n f i gur e 1) has a suf f i cien tl y n e ga t i v e b i as on i t s e m i t t e r . w h en v n = C0.5 v , t h e v ce o f q1 a nd q2 wil l be t h e s a me val u e as in t h e d e f a u l t c a s e w h e n v s u m i s g r ou nd e d . t h i s b i a s ne e d not b e acc u r a te, and a p o o r ly def i ne d s o ur ce ca n b e us e d . h o w e ver , t h e s o ur ce m u s t b e a b le t o s u pp o r t t h e q u ie s c en t c u r r en t as w e l l as t h e i n p t an d i r ef sig n al c u r r en t. f o r exa m ple , i t ma y b e c o n v e n i e n t to ut i l i z e a for w ard - b i a s e d j u nc t i on volt age of ab out 0.7 v o r a s c h o t t k y ba r r i er v o l t a g e o f a li t t le o v er 0.5 v . w i th t h e s u mmin g n o de a t g r o u nd , the ad l5306 ma y n o w b e us ed as a v o l t a g e- in p u t log a m p , a t ei t h er t h e n u m e ra t o r i n p u t i n p t o r t h e de n o min a t o r in p u t iref b y in s e r t in g a sui t ab ly s c a l e d r e sis t o r f r o m t h e v o l t a g e s o ur ce t o t h e r e l e van t p i n. th e o v eral l acc u rac y fo r sm al l in p u t v o l t a g e s is limi te d b y t h e v o l t a g e o f fs et a t t h e in p u ts o f th e jfet o p am ps. dc matri / dc supplies / dmm ribbon cable adl5306 characteriation board tria connectors (signal inpt and iref guard vsum shield ground) keithley 236 keithley 236 vsum vlog vout bfin vneg vpos vref iref inpt 03727-0-024 f i g u re 24. p r im ar y char ac t e ri zat i on s e t u p t h e pr i m ar y ch ar a c te r i z a t i on s e tup s h ow n i n fi g u re 2 4 i s u s e d to me a s u r e v ref , th e s t a t i c (d c) pe rf o r m a n c e , loga ri th m i c c o n f or m a nc e, sl op e a n d i n te rc e p t , t h e vo lt age s a p p e ar i n g at pi ns vs u m , i n p t , a nd iref , a nd t h e b u f f er o f fs et a nd v ref dr if t wi t h t e m p era t u r e . i n s o m e c a s e s, a f i xed r e sis t o r between pin s vref a nd iref was us ed in p l ace o f a p r ecisio n c u r r en t s o ur ce . f o r t h e d y nami c tests, i n cl udi n g n o is e an d b a nd w i d t h m e as ur em e n t s , m o r e s p eci a l i z e d set u ps a r e r e q u i r ed . t h i s i n c l ud es c l ose a t t e n t i o n t o t h e in p u t s t a b iliz in g n e t w o r ks; f o r exa m ple , t o en sur e s t a b le o p er a t io n o v er t h e f u l l c u r r en t ra n g e of i ref a n d t e m p era t ur e ext r e m e s , f i l t er co m p onen ts c1 = 4.7 nf a nd r13 = 2 k ? a r e us ed a t p i n iref t o g r o u n d . the us e o f a n e ga ti v e su p p l y als o al lo ws th e o u t p u t t o s w in g b e lo w g r o u nd , t h er eb y al lo win g t h e i n t e r c ept t o co r r es p o n d t o a midra n ge val u e o f i pd . h o we ve r , t h e vol t age v lo g re m a i n s r e fer e n c e d to t h e a c o m p i n, and w h i l e v lo g do es n o t s w in g n e g a t i ve fo r defa u l t o p er a t i n g c o n d i t io ns, i t is f r e e to do s o . th u s , add i ng a re s i stor f r om v l o g to t h e ne g a t i ve su p p ly lo w e rs al l val u es o f v lo g , w h ich ra is es t h e i n ter c ep t. th e d i s a d v a n ta g e o f t h i s m e th od i s th a t th e s l o p e i s r e d u c e d b y th e sh u n t i ng of t h e e x te r n a l re s i stor , and t h e p o or ly d e f i ne d r a t i o of o n -chi p an d o f f - chi p r e sis t an c e ca us es er r o rs in b o t h t h e s l o p e an d i n te rc e p t . a more a c c u r a te me t h o d f o r re p o s i t i on i n g t h e in t e r c ept fol l o w s. nc inpt vref iref scal bfin vpos 0.1 character i zatio n me tho d s dur i n g th e c h a r ac t e r i za tio n o f t h e ad l5306, the de vic e was t r e a t e d as a p r e c isio n c u r r en t-i n p u t loga r i t h mic co n v er t e r , b e c a u s e i t i s i m pr a c t i c a l to ge ne r a te a c c u r a te p h oto c u r re n t s b y ill u m i na ti n g a ph o t o d i o de . th e t e s t cur r en ts w e r e g e n e r a t e d b y usin g ei t h er a we l l -cal ib ra te d c u r r en t s o ur ce , s u ch as t h e k e i t hley 236, o r a hig h val u e r e sis t o r f r o m a v o l t a g e s o ur ce t o th e in p u t p i n . g r ea t ca r e i s n e eded w h en us i n g v e r y s m all i n p u t curr e n t s . f o r e x a m p l e , th e tri a x o u t p u t co nn ectio n f r o m th e c u r r en t g e n e ra to r was us e d wi t h t h e gua r d t i e d t o v s u m . th e in p u t t r ace o n t h e p c b o a r d wa s gua r de d b y conn e c t i n g ad jace n t t r aces to v s u m . th e s e m e as ur es a r e n e e d e d t o mini mi ze t h e r i s k o f le aka g e c u r r en t p a t h s. w i t h 0.5 v as t h e n o minal b i as o n t h e inp t p i n, a leaka g e-p a th resis t a n ce o f 1 g ? t o g r o u n d w o u l d s u b t rac t 0.5 na f r o m t h e in p u t, which am o u n t s t o a C0. 44 db er r o r f o r a 10 n a so ur ce curr e n t . a d di ti o n a l l y , th e v e r y h i gh o u t p u t re s i s t anc e a t t h e i n put pi ns an d t h e l o ng c a bl e s c o m m on l y n e ed ed d u ri n g c h a r a c t e ri z a t i o n a l l o w 6 0 h z a n d r f e m i s s i o n s t o in t r o d uce s u bs t a n t i a l m e as u r em e n t er r o rs. c a r e f u l gua r ding t e chniq u es a r e es s e n t ial t o r e d u cin g t h e p i ck u p o f t h es e s p ur io us sig n als . f i gure 25. c o nf igur ation for buffe r a m plifier band width measure m ent f i gur e 25 s h o w s t h e co nf igur a t i o n us e d t o m e asur e t h e b u f f er a m p l if ier bandwid th. the ad8 138 eval u a tion bo a r d in c l udes p r o v isio n s t o o f fs et v lo g a t t h e b u f f er in p u t, al l o win g m e as ur e m en ts o v er t h e f u l l ra n g e o f i pd u s ing a s i ng l e su p p ly . the n e t w o r k a n al yzer in pu t i m p e dan c es a r e s e t t o 1 m?.
adl5306 rev. 0 | page 13 of 16 r1 r2 1k ? 1k ? 1nf 1nf nc inpt vref iref scal bfin vpos 0.1 f +v s comm comm comm comm vneg vneg vsum vout vlog 1 2 3 4 56 78 9 10 11 12 13 14 15 16 adl5306 03727-0-026 ad8138 evaluation board hp3577a network analyzer +in b a output input r input a input b power splitter f i gure 26. conf igur atio n fo r l o ga rith mic a m p lif ier band width me asure m e n t f i gur e 26 s h o w s th e co nf igur a t io n us ed f o r f r eq uen c y r e s p o n s e m e a s ur e m en ts o f t h e loga r i t h mic a m plif ier s e c t io n. t h e ad8138 o u t p u t is o f fs et t o 1.5 v dc a nd m o d u l a t e d t o a dep t h o f 5% a t f r eq uen c y . r1 is ch os en (o v e r a wide ra n g e o f val u es u p t o 1.0 g?) t o p r o v ide i pd . th e b u f f er is us e d t o de lo ad vl o g . r1 200k ? 1k ? 1nf 1k ? 1nf nc inpt vref iref scal bfin vpos 0.1 f alkaline "d" cell a lkaline "d" cell comm comm comm comm vneg vneg vsum vout vlog 1 2 3 4 567 8 9 10 11 12 13 14 15 16 adl5306 03727-0-027 hp89410a source trigger channel 1 channel 2 f i g u re 27. conf ig ur at io n f o r n o is e spe c t r a l d e ns it y m e as ur e m ent the co nf igura t io n o f f i gur e 27 is us ed t o m e asur e th e n o is e p e r f o r ma n c e . b a t t e r i es p r o v ide b o t h t h e s u p p l y v o l t a g e and t h e in p u t c u r r en t in o r der t o minim i z e t h e in t r o d uc t i o n o f sp ur io us n o is e an d g r o u nd lo o p ef fe c t s. the en t i r e e v al u a t i o n sys t e m , in cl u d in g t h e c u r r en t s e t t i n g r e sist o r s, is m o un te d i n a clos e d a l umin u m e n cl osur e t o p r o v ide add i t i o n a l shi e ldin g t o ext e r n a l noi s e s o u r c e s . r1 200k ? 1k ? 1nf 1k ? 50k ? 1nf nc inpt vref iref scal bfin vpos 0.1 f +v s comm comm comm comm vneg vneg vsum vout vlog 1 2 3 4 56 78 9 10 11 12 13 14 15 16 adl5306 03727-0-028 tds5104 ch 1 lecroy 9210 ch a 9213 f i g u re 28. conf ig ur at io n f o r l o g a rit h mi c a m p lif ier p u ls e r e s p ons e mea s urem ent f i gur e 28 s h o w s t h e s e t u p us e d t o mak e t h e p u ls e r e s p o n s e m e as ur em e n t s . a s w i t h t h e ba n d wi d t h m e a s ur em en t , v l o g i s co nne c t e d dir e c t ly to bf in a nd t h e b u f f er a m pli f ier is co nf igur ed f o r a ga in o f 1. the b u f f er s o u t p u t is co nnec t e d thr o ug h a sh o r t ca b l e t o t h e tds5104 s c o p e , wi th the in p u t i m p e d a nc e s e t t o 1 m ? . t h e l e c r oy s output i s of f s e t to c r e a te t h e i n i t ial p e dest al c u r r en t fo r a g i v e n r1 va l u e . the p u ls e t h en cr e a tes a 1 - de c a de c u r r en t step .
adl5306 rev. 0 | page 14 of 16 evaluation board an evaluation board is available for the adl5306, the schematic of which is shown in 29. it can be configured for a wide variety of experiments. the buffer gain is factory-set to unity, providing a slope of 200 mv/dec, and the intercept is set to 1 na. table 4 describes the various configuration options. table 4. evaluation board configuration options component function default conditions p1 supply interface . provides access to supply pins vneg, comm, and vpos. p1 = installed p2, r8, r9, r10, r18 monitor interface . by adding 0 ? resistors to r8, r9, r10, and r18, the vref, vsum, vout, and vlog pin voltages can be monitored using a high impedance probe. p2 = not installed r8 = r9 = r10 = open (size 0603) r18 = open (size 0603) r2, r3, r4, r6, r11, r14, c2, c7, c9, c10 buffer amplifier/output interface . the logarithmic slope of the adl5306 can be altere d using the buffers gain- setting resistors, r2 and r3. r4, r6, r11, r14, c2, c7, c9, and c10 are provided for a variety of filtering applications. r2 = r6 = 0 ? (size 0603) r3 = r4 = open (size 0603) r11 = r14 = 0 ? (size 0603) c2 = c7 = open (size 0603) c9 = c10 = open (size 0603) vlog = vout = installed r1, r19 intercept adjustment . the voltage dropped across resistor r1 determines the intercept reference current, nominally set to 10 a using a 200 k? 1% resistor. r1 = 200 k? (size 0603) r19 = 0 ? (size 0603) r12, r15, c3, c4, c5, c6 supply decoupling c3 = c4 = 0.01 f (size 0603) c5 = c6 = 0.1 f (size 0603) r12 = r15 = 0 ? (size 0603) c11 filtering vsum c11 = 1 nf (size 0603) r13, r16, c1, c8 input compensation . provides essential hf compensation at the input pins, inpt and iref. r13 = r16 = 1 k? (size 0603) c1 = c8 = 1 nf (size 0603) iref, inpt, pd, lk1, r5 input interface . the test board is configured to accept a current through the sma connector labeled inpt. an sc style packaged photodiode can be used in place of the inpt sma for optical interfacing. by removing r1 and adding a 0 ? short for r5, a second current can be applied to the iref input (also sma) for evaluating the adl5306 in log-ratio applications. iref = inpt = installed pd = not installed lk1 = installed r5 = open (size 0603) j1 sc style photodiode j1 = open
adl5306 rev. 0 | page 15 of 16 c11 c8 r16 r11 0 ? c7 open c10 open c9 open c2 open r4 open r14 0 ? r8 open r3 open r6 0 ? r2 0 ? r1 200k ? 1% r13 1k ? 1k ? 1nf r10 open r18 open r5 open r19 0 ? c1 1nf 1nf r9 open 1 2 3 nc inpt vref iref i ref i pd scal bfin vpos c5 0.1 f c4 0.01 f c6 0.1 f c3 0.01 f comm comm comm comm vneg vneg vsum vout vlog vpos vlog vsum vref vout agnd vneg agnd vlog vlog vout vout iref inpt vref vsum lk1 sc-style pd 1 2 3 4 56 78 9 10 11 12 13 14 15 16 adl5306 12 3 p1 p2 1 2 3 4 5 03727-0-029 f i g u re 29. ev aluat i on b o a r d s c h e m a t i c 03727-0-030 f i g u re 30. co mpon ent sid e lay o ut 03727-0-031 f i g u re 31. co mpon ent sid e s ilk s c r e e n
adl5306 outline dimensions 1 0.50 bsc 0.60 max pin 1 indica t o r 1.50 ref 0.50 0.40 0.30 0.25 min 0. 45 2.75 bsc sq to p vi e w 12 max 0.80 max 0.65 nom seating plane pin 1 indicator 1.00 0.90 0.80 0.30 0.23 0.18 0.05 max 0.01 nom 0.20 ref 2 3.00 bsc sq 1.45 1.30 1.15 b o tto m vi ew compliant to jedec standards mo-220-veed-2 sq f i gure 32. 1 6 -l ead l e adfr a m e chip s c al e p a ck age [lfcs p ] (c p - 1 6 ) di me nsio ns sho w n i n mi ll im e t e r s esd caution esd (electrostatic discharge) sensitive device. ele c trosta tic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharge with out detection. although this product features proprietary esd protection circu i try, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. theref ore, prop er esd precautions a r e recommended to avoid perform a nce degradation or l o ss of functiona l ity. ordering guide adl5306 prod ucts temperature p a ckage pack age descri ption package outlin e branding 1 adl5306acp 2 C40c to +85c 16-lead lfcsp cp-16 jsa ADL5306ACP-R2 C40c to +85c tape and reel cp-16 jsa adl5306acp-r eel7 C40c to +85c 7 tape and reel cp-16 jsa adl5306-eva l e v a l u a t i o n boar d 1 bra n di n g i s a s fo ll o w s: line 1logo li n e 2j s a li n e 3k (d a t e co de) . d a t e co de i s i n yww form a t . 2 c o ntact f a ctory f o r avail abil ity. ? 2003 analo g de vices, inc. all rights reserve d . tra d em arks and registered tra d emar ks are the proper ty o f th eir respectiv e c o mpan ies . c03727C0 C 7/03(0) rev. 0 | page 16 of 16

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