.
鈥?/div>
frequency bandwidth of 18 kHz
STANDARD PACKAGING
鈥?10 pin PLID
廬
鈥?Chip (80 x 61 mils)
D
E
D S
N N
E G
M SI
M E
O D
C
E W
R E
T N
O R
N O
F
V
B
6
10
A
IN
5
O/P2
The LC551 consists of three gain blocks. The first block is an
inverting amplifier with the gain set by two external resistors.
This 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
inputs of the third block. The third block has a fixed
AC
gain
of 28 dB when driving a receiver.
This 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 harmonic
distortion produced by ground line resistance.
- A
- B
C
1
O/P1
A
OUT
4
REFERENCE
VOLTAGE
2
GND 1
9
GND 2
7
8
3
REF DEC2 DEC1
U.S. Patent No. 4,719,430, other patents pending.
BLOCK DIAGRAM
Revision Date: January 2001
Document No. 500 - 77 - 5
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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