鈥?/div>
mid supply referenced output
VC
DESCRIPTION
, R
MPO
)
The GS3001 incorporates Gennum鈥檚 GL504 preamp, all the
required coupling and decoupling capacitors, and a mid-
supply referencing 48 k鈩?resistor. All that is required further
for a fully functioning hearing aid system is the addition of a
microphone, receiver, volume control and an MPO adjusting
potentiometer.
The GS3001 can be mounted on the back of the hearing aid鈥檚
battery compartment. It has several access pads allowing for
adjustment of the frequency characteristics. An additional
ground pad (8a) is also included to aid in the manufacturability
of the system.
The GL504 chip is Gennum鈥檚 proprietary low current
preamplifier designed to drive class D integrated receivers.
This preamp has a built-in symmetrical peak clipping output
limiter and up to 46 dB of adjustable gain.
The major advantage of the GL504 over other preamplifiers is
the electronic MPO adjustment. Since conventional MPO is
not possible for integrated receivers, it is provided in the
preamp. The maximum output swing is easily set using an
R
MPO
resistor. The receiver output level is thus limited,
preventing it from exceeding the discomfort level.
STANDARD PACKAGING
鈥?Hybrid typical dimensions
0.140 in. x 0.240 in. x 0.110 in.
(3.56 mm x 6.10 mm x 2.79 mm)
V
MIC
3
6
C1
3碌3
R
MIC
7
RPULL
10
V
B
C2
A
IN
2
-
A
5
-
B
8
C4
9
B
OUT
47n
47n
R1
48k
C
IN
1
GL504
4
3
1
2
MGND
4
C3
GS3001
HYBRID
All resistors in ohms, all capacitors
in farads unless otherwise stated.
47n
5
6
8a
8
7
A
OUT
B
IN
PGND
MPO
BLOCK DIAGRAM
Revision Date: May 1998
Document No. 520 - 46 - 08
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
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