techni cal data electronic attenuator KK3340 1 8 p s u ff ix plas tic package c a se 6 26 pi n conn ecti on s 1 2 3 45 6 7 8 vi n co ntr o l gn d nc vcc vo r o llo f f nc the kk 3340 is a simple but very effective electronic attenuator. t h is device offers up to 80 db of attenuation control for frequencies to 1.0 mhz. thd (disto rtion) is less than 1% - up to 15 db attenuation and less that 3% - up to 40 db. typical uses include instrum e nt ation control, rem o te control audio am plifiers, electronic gam e s, and catv (c able tv) set-top converter audio control. ? designed for use in: dc operated volum e control com p ression and expansion am plifi e r applications ? controlled by dc voltage or external variable r e sistor ? econom ical 8-pin dual-in-line package maximum ratings (t a = +25 o c, unless otherwise noted) r a t i n g s y m b o l v a l u e u n i t powe r supply voltage v cc 2 0 v d c powe r dissipation @ (t a = +25 o c); derate above t a = +25 o c p d 1.2 10 w mw o c operating ambient tem p eratur e range t a 0 ? +75 o c 1
KK3340 2 7 620 pf rc 1. 0 u 3 6 8 1 50k vc c 50u kk3 340 e o remotely loc ate d potentiometer figure 1. typic a l dc r e mo t e vol u me c ontrol electrical characteristics (e in = 100 mvr m s, f = 1.0 khz, v cc = 16 vdc, t a = +25 o c, unless otherwise noted) c i r c u i t c h a r a c terist ics m i n t y p m a x unit operating power supply voltage 0.8 - 18 vdc control terminal sink curr ent, p i n 2 (e in = 0) - - 2 . 0 madc maximum input voltage - - 0.5 vrms voltage gain 11 13 - db attenuation r a ng e from maximu m gain (v2 = 6 . 5 vdc) 7 0 8 0 - d b total harmonic distortion (pin 2 gnd) (e in = 100 mvrms, e o = a v * e in ) - 0 . 6 1 . 0 % vc c 2 7 620pf 1. 0u 3 6 8 1 50uf kk 3340 e o e in + - + v2 attenuation point a v = 20 db 4.44 4.68 4.92 vdc 5 . 1k 5. 1k 1. 3k 1.5 k 51 0 5 1 0 20k 5. 1 k 5 . 1k 5. 1k 6. 2k 5. 1k 20 0 4. 7 k 75 0 10 k 75 0 3.9 k 2 31 in p u t con t ro l ou tp ut roll-of f vc c 8 6 7 fig u re 2 . cir c ui t sch e m a ti c 2
f i g u r e 3 . a t t e n u a t io n v e r s u s d c c o n t r o l v o lt a g e 0 20 40 60 80 10 0 1 . 5 2 .5 3 . 5 4 .5 5 . 5 6 . 5 v2 , c o n t r o l vo l t a g e ( v ) a t t e nuat i o n ( d b) vc c = 8.0 v d c v cc = 12 vdc v cc = 16 v d c f i g u r e 4 . at t e n u a t i o n ve r s u s co n t r o l re s i s t o r 0 20 40 60 80 10 0 1 1 0 100 r c , co nt ro l re s i s t o r ( k o m ) at t e nua t i o n ( d b) 0 db r e f e r e nc e = 1 3 g a in f = 1.0 k h z r c , is f r o m pin 2 to gro und fi gu r e5 . fr equ e n c y res pon se 0 2 4 6 8 10 12 14 1. 00e + 0 2 1 . 00e + 0 3 1 . 00e + 0 4 1 . 00e + 0 5 1 . 00e + 0 6 1 . 00e + 0 7 1 . 0 0e + 0 8 f, f r e q ue ncy (hz ) vg, vol t a ge gain (d b) 3 KK3340
fi gu r e 6. o u t p u t vol t age sw i n g 0 2 4 6 8 10 8 9 10 11 12 13 14 15 16 17 18 vc c, su ppl y vo l t a g e (v) ou tpu t volta g e swin g (vp-p) fi gur e 7. to t a l h a r m o n i c d i st or t i on 0 0. 5 1 1. 5 2 2. 5 3 3. 5 4 0 1 0 2 03 04 05 0 6 07 08 0 a t t e nu a t i o n ( d b) t hd, t o t a l harm o n ic d i s t o r t i o n ( % ) 0 db ref e r e nce = 1 3 db g a i n f = 1. 0 k h z e o = 2. 5 v r m s 4 KK3340
n s u f f i x p l as t i c di p ( m s ? 00 1b a ) sy m b o l m i n m a x a 8. 51 10. 16 b 6. 1 7 . 1 1 c 5. 33 d 0. 36 0. 56 f 1. 14 1. 78 g h j 0 10 k 2. 92 3. 81 no t e s : l 7. 62 8. 26 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 . 3 6 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 . n 0. 38 d su f f i x so i c (m s - 0 1 2 a a) sy m b o l m i n m a x a 4. 8 5 b 3. 8 4 c 1. 35 1. 75 d 0. 33 0. 51 f 0. 4 1 . 2 7 g h j 0 8 no t e s : k 0. 1 0 . 2 5 1. d i m e n s 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 on . m 0. 19 0. 25 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 p 5. 8 6 . 2 fo r a ; fo r b ? 0. 25 m m ( 0 . 010) p e r s i d e . r 0. 25 0. 5 1. 27 5. 72 d i me n s i o n , mm d i me n s i o n , mm 2. 54 7. 62 a b h c k c m j f m p g d r x 4 5 se a t i n g pl a n e 0 . 25 (0 . 0 10 ) m t -t - 1 8 4 5 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 .01 0 ) m t -t - c 1 8 4 5 5 KK3340
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