GB512 Datasheet, PDF (1/5 Pages) Gennum Corporation – 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 ∞:1
• automatic setting of transducer current
• operation down to 1.1 VDC
• greater than 40 dB volume control range
STANDARD PACKAGING
• 8 pin PLID
• 8 pin SLT (LD512)
• Chip (61 x 61 mils)
Au Bump
Low Parts
Compression Amplifier
GB512/LD512 DATA SHEET
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.
V_REG ⁴
V_B
5
V_REG
3
A IN
28 dB
-A
CONTROL
2
C_AGC
200 mV
REF
16 dB
-B
+
_^C
6
GND
18
B OUT C IN
BLOCK DIAGRAM
7
C OUT
Revision Date: January 2001
Document No. 500 - 75 - 08
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone] fax: [phone]
Japan Branch: A-302, Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan tel. [phone] fax [phone]