GS551 DATA SHEET
High Power, Class B
Output Stage
FEATURES
• adjustable gain to 48 dB
• capable of driving low impedance receiver
• low component count, 3 small capacitors and 1 resistor
• gain trim can be used as vol. control for reduced noise
• minimal start-up transient
• no gain expansion
STANDARD PACKAGING
• 10 pin MICROpac
• 10 pin PLID®
• 10 pin SLT
• Chip (68 x 60 mils)
CIRCUIT DESCRIPTION
The GS551 is a 10 pin, low voltage, class B amplifier which
operates over a battery range of 1.1 VDC to 3 VDC.
The GS551 consists of three gain blocks. The first block is
an inverting amplifier with the gain set by two external
resistors. The gain trim feature can be used as a volume
control in hearing aid applications. The second block is an
inverting unity gain amplifier which serves as a phase
splitter. The outputs from the first and second blocks drive
the differential input of the third block. The third block has
a fixed AC gain of 28 dB when driving a receiver.
The amplifier has internal compensation eliminating the
need for a capacitor across the receiver. Two ground pins
are available for “Star” grounding to reduce any second
order harmonic distortion introduced by ground line resistance.
REFERENCE
VOLTAGE
C
- B
- A
GND 1
4
29
GND 2
7
8 3
1
10
6
5
A IN
A OUT
V
B
C OUT 2
C OUT 1
VREF
DEC 1
DEC 2
U.S. Patent No. 4,719,430
Other Patents Pending
BLOCK DIAGRAM
Revision Date: January 2001
Document No. 510 - 31 - 04
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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