technical data gain controlled microphone preampli- fier/vogad the il 6270 is a silicon integrated circ uit com b ining the functions of audio am plifier and voice operated gain ad- justing device (vogad). it is designed to accept signals from a low sensitivity m i crophone and to provide an essentially constant output signal for a 50db range of input. the dy nam i c range, attack and decay tim es ar e controlled by external com ponents. features ? c onst a nt out put si gnal t am b = -30oc - +70o for any type of package fig.1 n ? i n d e x o f d i p o i c d ? i n d e x o f s 8 1 8 1 ? fast attack ? low power c onsum pt i on ? sim p le circu itry applications ? audi o agc sy st em s ? transm itter overm odulation protection ? tape recorders quick reference data ? suppl y vol t a ge: 4.5v t o 10v ? vol t a ge gai n : 52db absolute maximum ratings ? suppl y vol t a ge: 12v ? storage tem p erature: -55 0 c t o +125 0 c pin connection 1 2 3 4 8 7 6 5 u cc ag c t im e c o n s t pr e a m p o u t p u t pr e a m p i n p u t pr e a m p i n p u t ov m a i n a m p i n pu t ma i n a m p o u t p u t fig.2 1
IL6270 main a m p input pream p input pream p input u cc pream p out put agc detector ov agc tim e out put main a m p out put fig.3 IL6270 block diagram 2
IL6270 electrical characteristics (u cc =6v, f i =1khz, t am b =-30oc t o +85oc ) characteristics conditions value units min typ. max suppl y current 5 10 m a input i m pendance pi n 5 or 6 150 ohm di fferent i a l i nput i m - pendance 3 0 0 ohm vol t a ge gai n 72m kv rm s i n - put pi n 4 4 0 5 2 db out put l e vel 4m v rm s i nput pi n 4 5 5 9 0 1 4 0 m v rm s thd 90m v rm s i nput pi n 4 2 5 % equi val e nt noi se i nput vol t a ge f i =400 ? ? 25khz r i =300ohm 1 m k v 3
IL6270 27 8 4.7n 10k 680 2.2u voltage gain = upp e r fre quen cy respo n se 10 kom/4.7nf = 3 k hz low er fre quen cy respo n se 68 0 om/2 . 2u f = 300 hz 10 kom 680 om external external 1 2 3 45 6 7 8 100n input i nput output 1kohm min load 10u 4.7n 2.2u +6 v 47u 1m if inp u t no t ac cou p led th e res i stance b e tween pins 4 an d 5 mu st b e les s than 10 ohms n. b. 22k fig.4 il6 270 test a nd app l ication circ uit fig.5 il 6270 fre quen cy re spon se 4
IL6270 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
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