? cic suitable package size ? 8:1 compression ratio ? 38 db maximum system gain, adjustable over a 38 db range ? output compression threshold, adjustable over 16 db range ? designed to drive a class d integrated receiver ? averaging detector standard packaging hybrid typical dimensions: 0.162 in x 0.094 in x 0.070 in (4.11 mm x 2.39 mm x 1.78 mm) c1 0 1 c2 0 1 c3 0 15 out in gnd c4 33n c5 22n GS3026 12k 48k v b reg. 48k -a rect. b 8:1 compression control v b r vc v reg r th 1 2 3 5 6 4 7 GS3026 - data sheet agc-o in a cic size hybrid features description the GS3026 cic hybrid features agc-o capability for low distortion output limiting and offers a package size suitable for cic instruments. the circuit consists of a newly designed agc preamplifier and output stage, capable of driving the class d integrated receiver. the compression control circuit varies the current controlled resistance, connected between the input and output of the agc preamplifier. the compression circuit operates with an 8:1 compression ratio and uses an averaging detector with a time constant of 270 ms, selected to provide optimal sound quality over the full range of sound and listening environments. the actual attack and release times are typically 40 ms and 150 ms respectively when the circuit is fully in the compression region of operation (measured times will vary depending on gain and threshold settings). the system gain and compression control can be adjusted by the choice of two independent resistors. maximum system gain is 38 db and it can be adjusted within a 38 db range. the output compression threshold can be adjusted within a 16 db range. block diagram all resistors in ohms, all capacitors in farads unless otherwise stated. revision date: july 1998 document no. 521 - 71 - 02 gennum corporation p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 tel. +1 (905) 632-2996 web site: www.gennum.com e-mail: hipinfo@gennum.com
521 - 71 - 02 3026 2 parameter symbol conditions min typ max units hybrid current i amp - 165 240 m a minimum voltage v b - 1.1 - v total harmonic distortion thd v in =-60dbv - 0.5 1 % input referred noise irn a weighted - 2 2.5 m v rms total system gain a v v in =-70dbv 35 38 41 db regulator voltage v reg 890 950 1000 mv power supply rejection ratio psrr 49 57 - db agc maximum threshold th max v in =-60dbv -43 -41 -39 dbv (output referred) note 2 minimum threshold th min v in =-70dbv r th = 200k -59 -57 -55 dbv (output referred) note 2 vc gain range d a vc r vc =200k w to 0 w 35 38 41 db compression ratio high threshold cmp-h v in =-60dbv to -30dbv r th =0 8 9.0 10 ratio compression ratio low threshold cmp-l v in =-70dbv to -40dbv r th =200k 6.5 7.3 9 ratio stage a gain a a v in =-70dbv 24 27 30 db compression gain range a range r th =200k; note 1 47 50 55 db agc time constant t agc - 270 - ms output stage gain a b 91113db output resistance 20 24 28 k w all parameters and switches remain as shown in the test circuit unless otherwise stated in conditions column. note 1 . a range = a a -a a [v in = -20dbv] 2 . measured at output of stage a absolute maximum ratings parameter value / units supply voltage 3 vdc power dissipation 25 mw operating temperature range -10 c to 40 c storage temperature range -20 c to 70 c pad connection conditions: frequency = 1 khz, temperature = 25 c, supply voltage v b = 1.3 v electrical characteristics 1 v b 3 v reg 2 in 4 r vc 5 out 6 r th 7 gnd caution class 1 esd sensitivity
3026 521 - 71 - 02 3 fig. 1 production test circuit fig. 2 typical hearing instrument application all resistors in ohms, all capacitors in farads unless otherwise stated. all resistors in ohms, all capacitors in farads unless otherwise stated. c1 0 1 c2 0 1 2 2 c3 0 15 c4 33n c5 22n GS3026 12k 48k v b reg. 48k -a rect. b 8:1 compression control any knowles class d integrated receiver any knowles or microtronic microphone v b v b r vc r th 2 1 2 3 5 6 4 7 c1 0 1 c2 0 1 c3 0 15 c4 33n c5 22n GS3026 12k 3k9 48k 50k v b v in reg. 48k -a rect. v out b 8:1 compression control v b r vc =200k r th =0 1 2 3 5 6 4 7
521 - 71 - 02 3026 4 fig. 4 characterization circuit (used to generate typical curves) fig. 3 typical hearing instrument assembly diagram all resistors in ohms, all capacitors in farads unless otherwise stated. - + rec battery mic r vc r th + + 1 3 2 4 5 6 2 2 7 c1 0 1 c2 0 1 c3 0 15 c4 33n c5 22n GS3026 12k 3k9 pink noise generator or 1khz for i/o 48k 50k v b reg. 48k -a rect. v out b 8:1 compression control 1.3v r vc =200k r th =200k 4 1 2 3 5 6 4 7
3026 521 - 71 - 02 5 100 1000 500 400 300 200 -140 -120 -100 -80 -60 -40 -20 0 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 -15 -140 -120 -100 -80 -60 -40 -20 0 0.1 1 10 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 0.04 100 -140 -120 -100 -80 -60 -40 -20 0 1000 500 400 300 200 10 15 20 25 30 35 40 100 1k 10k 20k 20 -95 -85 -75 -65 -55 -45 -35 -25 -15 -140 -120 -100 -80 -60 -40 -20 0 output (dbv) input (dbv) fig. 5 input vs output volume control settings gain (db) frequency (khz) fig. 7 frequency response vs r th amplifier current ( m a) fig. 8 amplifier current vs r vc input (dbv) amplifier current ( m a) fig. 10 thd vs input thd (%) r vc =200k 100k 50k 25k 10k 3.3k 0 w r th = 0 v in =1khz output (dbv) input (dbv) fig. 6 input vs output threshold settings r th = 0 50k 200k r th = 0 r th =50k r th =200k r vc = 200k v in =-70dbv r th = 0 v in =1khz r vc = 200k input (dbv) fig. 9 amplifier current vs r th v in =1khz r vc =200k input (dbv) v in =1khz r vc =200k r th = 200k r th =0 r th = 200 50k 0 r vc = 0 v in =1khz r vc = 200k
521 - 71 - 02 3026 6 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 100 1k 10k 0.01 0.1 1 10 -80 -70 -60 -50 -40 -30 -20 -10 0 0.01 0.1 1 10 10k 100k 3k thd (%) frequency (hz) fig. 11 thd vs frequency fig. 12 intermodulation distortion vs input frequency (hz) r th =0 v in =-40dbv r vc =200k r th = 200k v in =1khz r vc =200k r th =0 imd (%) imd (%) input (dbv) fig. 13 intermodulation distortion vs frequency r th =0 v in =-40dbv r vc =200k
3026 521 - 71 - 02 7 0.094 (2.39) 0.162 (4.11) 0.075 max (1.91) 1 c1 c5 c4 3 2 4 5 6 7 c2 c3 xxx xxx dimensioning units are inches. dimensions shown in parenthesis are in millimetres, converted from inches and include minor round off errors. 1.0000 inches = 25.400mm. dimension tolerances 0.003 (+0.08) unless otherwise stated. pad numbers and capacitor numbers for illustration only. smallest pad sizes 0.024 x 0.023 (0.61 x 0.58). largest pad size 0.020 x 0.040 (0.51 x 1.02). xxxxxx - work order number. this hybrid is designed for point to point manual soldering. for more information contact gennum corporation. fig. 14 hybrid layout and dimensions document identification: data sheet the product is in production. gennum reserves the right to make changes at any time to improve reliability, function or design, in order to provide the best product possible. gennum corporation assumes no responsibility for the use of any circuits described herein and makes no representations that the y are free from patent infringement. ? copyright august 1996 gennum corporation. all rights reserved. printed in canada. revision notes: updated to data sheet, corrections to th max and th min
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