GS3001 Datasheet, PDF (1/5 Pages) List of Unclassifed Manufacturers – Preamp Hybrid for Class D

FEATURES
• designed to drive class D integrated receivers
• adjustable peak clipper
• low current drain (150 µA typical)
• 46 dB of adjustable gain
• low external parts required (R_VC, R_MPO)
• low noise and distortion
• mid supply referenced output
STANDARD PACKAGING
• 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)
Preamp Hybrid for Class D
DESCRIPTION
GS3001 - HYB DATA SHEET
The GS3001 incorporates Gennum’s GL504 preamp, all the
required coupling and decoupling capacitors, and a mid-
supply referencing 48 kΩ 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’s
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’s 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.
VMIC 3
R_MIC
6
C1
3µ3
C2
A_IN 2
47n
-A
5
7
RPULL
-B
8
10 V_B
C4
9 B_OUT
47n
R1
C_IN 1
48k
GL504
4
31
2
MGND 4
GS3001
HYBRID
All resistors in ohms, all capacitors
in farads unless otherwise stated.
C3
47n
5
A_OUT
6 8a 8
B_IN PGND
7
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. [phone]
Web Site: www.gennum.com E-mail: [e-mail]