description the GS3015 incorporates gennum's gl504 preamp, three of the required capacitors and a mid supply referencing 48k resistor. all that is required for a fully functional hearing aid system is the addition of a microphone, receiver, volume control, interstage coupling capacitor and an mpo adjusting potentiometer. the GS3015 has been designed to mount on the back of the microtronics pj88s socket volume control. this translates to a saving in space within the hearing instrument, as the circuitry mounts directly beneath the volume control. if the vc requires replacing, it is a simple procedure to remove the defective unit from the socket and install a new device. this does not disturb the electronic circuitry. the major advantage of the gl504 over other preamplifiers is the electronic mpo adjustment. since conventional mpo is not possible in a class d receiver, gennum provides it in the preamp. block diagram v.c. preamp hybrid for class d ? gennum's gl504 preamp ? mounts on back of microtronic pj88s vc socket ? low external parts count ? designed to drive class d integrated receivers ? adjustable peak clipper ? low current drain (150 m a) typical ? low noise and distortion features standard packaging ? hybrid typical dimensions 0.192 in x 0.194 in x 0.113 in (4.88 mm x 4.93 mm x 2.85 mm) GS3015 - hyb data sheet c2 47n c3 47n v b 5 r mic 7 v rec gnd r1 48k 3 2 8 6 1 4 GS3015 r pull c1 3? 10 a out 9 5 3 6 hybrid - b 1 7 8 a in v mic 2 4 c in ct b in mpo 11 b out - a all resistors in ohms, all capacitors in farads unless otherwise stated revision date: may 1998 document no. 520 - 92 - 05 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
520 - 92 - 05 2 absolute maximum ratings parameter value/units supply voltage 3 v dc power dissipation 25 mw operating temperature range -10 c to +40 c storage temperature range -20 c to +70 c caution class 1 esd sensitivity pin connection parameter symbol conditions min typ max units amplifier current i amp v in = 0, r mpo = 0 w 75 150 225 m a system gain a v v in = -80 dbv, r mpo = 0 w , freq.= 5 khz 44.5 46.5 48.5 db maximum output mpo v in = -50 dbv, r mpo = 0 w -16 -14 -12 dbv mpo range d mpo v in = -50 dbv, r mpo = 10 k w 10 12 14 db input referred noise irn nfb 0.2 to 10 khz at 12 db/oct - 2 - m v rms distortion thd - <1.0 - % on chip pull-up resistance r pull -48-k w on chip microphone resistor r mic -4-k w mic decoupling capacitor c1 -20% 3.3 +20% m f input coupling capacitor c2 -10% 0.047 +10% m f output coupling capacitor c3 -10% 0.047 +10% m f output resistor r1 -5% 48 +5% k w output impedance (pad 1) r out - 24 - k w electrical characteristics conditions: frequency = 1 khz, temperature = 25 c all parameters and switches remain as shown in test circuit unless otherwise stated in "conditions" column ct bin mpo cin bout vmic 8 11 6 7 10 9 2 1 3 4 5 vrec aout gnd vb ain top view
520 - 92 - 05 3 c2 47n c3 47n 1.3 vdc 5 r mic 7 47n r1 48k 3 2 8 6 1 4 r pull c1 3? 11 vout r fa =100k 9 5 3 6 GS3015 hybrid 4 - b 1 7 8 r mpo =10k i amp v in 1khz 3.92k 2 10 - a all resistors in ohms, all capacitors in farads unless otherwise stated fig.1 production test circuit all resistors in ohms, all capacitors in farads unless otherwise stated fig. 2 typical hearing instrument application c2 47n c3 47n 1.3 vdc 5 r mic 7 vc switch 47n r1 48k 1 3 2 8 6 1 4 r pull c1 3? mic 2 class d integrated receiver vc 9 5 3 6 GS3015 hybrid 8 4 - b 1 7 11 10 r mpo 10k - a
520 - 92 - 05 4 0 5 10 15 20 25 30 r mpo (k w ) fig. 7 relative amplifier current vs mpo resistance r vc =33k r vc =10k -100 -90 -80 -70 -60 -50 -40 -30 -20 input (dbv) r mpo =0 w r mpo =3.3k r mpo =10k fig. 4 i / o for various r mpo values -140 -120 -100 -80 -60 -40 -20 input (dbv) fig. 3 i / o for various r vc values r vc =100k 20 200 2k 20k frequency (hz) c=0 c=0.1 m c=0.22 m -15 -25 -35 -45 -55 -65 -75 -85 -95 2 0 -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -10 -15 -20 -25 -30 -35 -40 -45 -50 fig. 5 frequency response for various c||c2 values r vc =3.3k 10 9 8 7 6 5 4 3 2 1 0 -90 -86 -82 -78 -74 -70 -66 -62 -58 input (dbv) fig. 6 distortion vs input level (r vc =100k w ) relative amplifier current ( m a) output (dbv) thd (%) output (dbv) relative output (db)
520 - 92 - 05 5 fig. 10 hybrid layout and dimensions no load 50k load fig. 8 output vs mpo resistance 10 100 1k 10k 100k frequency (hz) fig. 9 preamplifier a open loop voltage gain 0 10 100 1k 10k 100k r mpo ( w ) -10 -14 -18 -22 -26 -30 -34 -38 -42 -46 -50 55 50 45 40 35 dimensioning units are inches. dimensions shown in parenthesis are in millimetres, converted from inches and include minor round off errors 1.0000 inches = 25.4mm. minimum pad size 0.015in x 0.025in (0.38mm x 0.64mm). pad numbers & capacitor numbers for illustration only. dimensions tolerances:+0.013in -0.002in (+0.33mm -0.05mm) unless otherwise stated. xxxxxx - work order number. 0.080 max (2.03) 0.192 (4.88) 0.123max (3.13) 8 11 6 7 10 9 2 1 3 4 5 top view bottom view 0.194 (4.93) 8 11 6 7 10 9 2 1 3 4 5 c3 c2 0.063 max (1.60) c1 3015 xxxxxx output (dbv) gain (db)
520 - 92 - 05 6 bottom view of switches battery switch e s a battery switch s a e battery sw battery sw eg. left volume control potentiometer 88s - 00 - 011 - 1 - 25 - 104/00 eg. right volume control potentiometer 88s - 00 - 011 - 2 - 24 - 104/00 eg. of socket 88s 10-1-1/00 for more information on microtronic ordering codes, refer to microtronic data sheet pj88s fig. 11 gennum hybrid concept with microtronic pj88s vc socket mpo trimmer volume control battery mic + - + 11 9 1 10 8 7 6 5 4 3 2 rec + fig. 12 typical assembly diagram 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 june 1993 gennum corporation. all rights reserved. printed in canada. revision notes: updated to data sheet
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