• 8 pin PLID

• 8 pin SLT (LD512)

• Chip (61 x 61 mils)

Au Bump

DESCRIPTION

The GB512 and LD512 are 8 pin stand-alone input compression

amplifiers requiring minimal external parts. Each consists of a

voltage regulator for the electret microphone providing a high

power supply rejection ratio (PSRR), a compression stage

which has a 2:1 compression ratio, and an auto-biasing,

class A, voltage drive output stage.

The auto-bias output stage can drive a variety of impedances

ranging from 500

Ω to 5 kΩ without adding any external

resistors to set the bias.

The GB512 and LD512 are recommended for low to medium

gain/output ITE and ITC type hearing aids.

The GB512 is tested to tighter test limits.

GB512/LD512 DATA SHEET

Low Parts

Compression Amplifier

FEATURES

• 44 dB typical preamplifier gain

• 14 dB typical output stage gain

• compression function ratio 1:1 to 2:1 to

• automatic setting of transducer current

• operation down to 1.1 VDC

• greater than 40 dB volume control range

STANDARD PACKAGING

Document No. 500 - 75 - 08

200 mV

REF

V

REG

7

A IN

V

REG

C

AGC

3

8

4

5

6

1

C

+

_

B

-

GND

B OUT C IN

C OUT

28 dB

16 dB

CONTROL

2

BLOCK DIAGRAM

Revision Date: January 2001

GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946

Japan Branch: A-302, Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan

tel. (03) 3334-7700

fax (03) 3247-8839