GS3034 - data sheet revision date: december 1998 linear class h cic size hybrid features ? complete linear system ? current mode class h output stage ? current drive power amp ? low distortion / low noise ? low amplifier current 190 m a typical ? small size for cic applications standard packaging ? hybrid typical dimensions (0.180in x 0.075in x 0.055in) (4.57mm x 1.91mm x 1.40mm) ? hybrid view description the GS3034 hybrid offers gennums new innovative class h output stage along with two low noise inverting preamplifiers, in a cic size package. this new breed of output stage adapts the bias current of the receiver to the user's listening environment. in relatively loud environments the receiver will be fully biased similar to a traditional class a amplifier. however, as the loudness of the environment decreases, the bias current of the receiver adjusts to a minimum level required to cleanly pass the signal. at the same time the system maintains adequate headroom should the amplitude of the signal suddenly increase. by adapting the bias of the output stage to the requirements of the signal being processed, significant current savings can be realized compared to traditional class a amplifiers. the rate at which the bias adapts is associated with a capacitor connected from pad cc of the hybrid to ground. for optimum performance it is recommended that a 0.22 m f capacitor be used. the two low noise preamplifiers stage a and stage b, can be used as volume control and gain trim elements or stage a as a filter shaping element and stage b as the volume control. as the output stage is current drive, frequency shaping is relatively easy via the addition of a capacitor across the receiver. v reg v reg gnd in b out b in a out a in r e v b cc b rin out - a c1 170 24k 12k - c2 0 1 control regulator v b v b c3 0 1 12k b + - + - c 0 1 c4 15n GS3034 10 5 9 8 3 2 1 12 11 7 6 4 all resistors in ohms, all capacitors in farads unless otherwise stated. functional block diagram document no. 521 - 51 - 04 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
2 521 - 51 - 04 parameter symbol conditions min typ max units overall amplifier current i amp 80 190 300 m a minimum operating voltage v b - - 1.1 v overall gain a v 44 47 50 db distortion thd v in = -40 dbv - 0.2 1 % r gt = r vc = 10 k w input referred noise irn a weighted filter - - 2.5 m v rms voltage regulator regulator voltage v reg i load = 30 m a 870 920 970 mvdc output noise a weighted filter - 2.9 - m v rms stage a and stage b input bias current i bias r vc = r gt = 1 m w -25 0 25 na dc voltage gain stage a a ol -a 38 52 - db stage b a ol -b 30 40 - db current source capabilities i source 15 30 - m a output voltage swing - low v sink 200 280 - mv stage c & control circuit maximum current sinking i sink r e grounded, v out = 1.3 v 3 6 - ma output impedance r out 20 24 - k w minimum emitter voltage v re-min 25 9mv maximum emitter voltage v re-max 68 73 80 mv minimum transducer current i t-min 22050 m a maximum transducer current i t-max 300 400 500 m a maximum/minimum transducer i range 15 28 - db current ratio dynamic headroom headroom note 1 14 17 22 db time constant t c c cc = 0.22 m f - 130 - ms all parameters and switches remain as shown in the test circuit unless otherwise stated in conditions column. pad connection caution class 1 esd sensitivity absolute maximum ratings parameter value / units supply voltage 5 vdc power dissipation 25 mw operating temperature range -10 c to 40 c storage temperature range -20 c to 70 c conditions: frequency = 5 khz, temperature 25 c, voltage supply = 1.3 vdc electrical characteristics notes: 1. headroom = 20 log (v re dc / v reacrms ) [v in = -79 dbv] 12 11 10 9 8 7 6 5 4 3 2 1 b out gnd v reg in br in b in re a out a in v b out cc
3 521 - 51 - 04 v reg - a c1 170 * minimum 10 nf capacitor needed for correct operation 24k - 170 x v remax 170 x i bias - v remax control regulator v b r e i bias v b v b c3 0 1 12k b + - + - c 0 1 c4 15n GS3034 10 5 9 8 3 2 1 12 11 7 6 4 100k 100k any knowles or microtronic class a receiver (e.g. eh3052) any knowles or microtronic microphone (e.g. em5046 or model 39) c cc c p 12k 0 22 10n r gt r vc = * all resistors in ohms, all capacitors in farads unless otherwise stated. all resistors in ohms, all capacitors in farads unless otherwise stated. fig. 1 productiontest circuit fig. 2 typical hearing instrument application v reg - a c1 170 24k 1k 100k 100k 3k9 1.3v 2.6v - c2 0 1 control regulator v b c cc v in r gt r vc c3 0 1 12k 12k b + - + - c 0 1 10n c4 15n GS3034 10 5 9 8 3 2 1 12 11 7 6 4 this capacitor value is not suitable for actual hearing instrument designs. values other than 0 22 can result in significantly increased distortion
4 521 - 51 - 04 all resistors in ohms, all capacitors in farads unless otherwise stated. fig. 4 characterization circuit fig. 3 typical assembly diagram volume control battery + - rec + mic 0 22 r gt + 12 11 10 9 8 7 6 5 4 3 2 1 10n v reg - a c1 170 325 24k 12k - c2 0 1 control regulator v b v b c3 0 1 12k b + - + - c 0 1 c4 15n GS3034 10 5 9 8 3 2 1 12 11 7 6 4 1.8k 100k 100k 3k9 1.3v 2.6v c cc v in v out 0 22 r gt r vc
5 521 - 51 - 04 5 0 -10 -20 -30 -40 -50 -60 -70 -80 2k2 1m 10 1m v o 10 55 50 45 40 35 30 25 20 15 10 50 45 40 35 30 25 20 15 10 5 0 60 50 40 30 20 10 0 gain (db) gain (db) output (dbv) -120 -100 -80 -60 -40 -20 -0 input level (dbv) fig. 5 input vs output r vc =100k r vc =33k 20 100 1k 10k 20k frequency (hz) fig. 6 gain vs frequency v in =-60dbv transducer current ( m a) 1k 100 60 -120 -100 -80 -60 -40 -20 input (dbv) fig. 7 transducer current vs input thd (%) 10 100 1k 10k 100k frequency (hz) fig. 9 stage a and stage b open loop gain r vc =10k r vc =3k3 r vc =1k r vc =100k r vc =33k r vc =10k r vc =3k3 r vc =1k r vc =33k r vc =100k r vc =10k r vc =3k3 r vc =1k -90 -85 -80 -75 -70 -65 -60 -55 -50 -45 -40 -35 -30 -25 -20 input (dbv) fig. 8 distortion vs input stage b stage a r vc =33k r vc =100k r vc =10k r vc =3k3 r vc =1k ? = 3khz
6 521 - 51 - 04 dimension units are in inches. dimensions in parenthesis are in millimetres converted from inches and include minor rounding errors. 1.0000 inches = 25.400 mm. pad sizes 0.021 x 0.029 (0.53 x 0.74). dimension tolerances: 0.003 (+0.08) unless otherwise stated. pad numbers for illustration only. xxxxxx - work order number. this hybrid is designed to be reflowable for gennum's reflow process profile. for more information contact gennum corporation. fig. 10 hybrid layout & dimensions 0.180 (4.57) 0.075 (1.91) 12 11 10 9 8 7 6 5 4 3 2 1 b out gnd v reg in br in b in re a out a in v b out cc max 0.064 (1.63) xxxxxx 34 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 january 1996 gennum corporation. all rights reserved. printed in canada. revision notes: correction to typical assembly diagram. gennum corporation mailing address: p.o. box 489, stn. a, burlington, ontario, canada l7r 3y3 tel. +1 (905) 632-2996 fax +1 (905) 632-2814 shipping address: 970 fraser drive, burlington, ontario, canada l7l 5p5 gennum japan corporation c-101, miyamae village, 2-10-42 miyamae, suginami-ku, tokyo 168-0081, japan tel. +81 (3) 3334-7700 fax: +81 (3) 3247-8839
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