Class A Output Stage
with Input Biasing
LE507 DATA SHEET
FEATURES
•
76 dB of gain
•
internal DC bias for I/P stage
•
applications include AF output stages,
hearing aids and RF amplifiers
•
total harmonic distortion 1% (typical)
STANDARD PACKAGING
• 8 pin PLID
®
• 8 pin DIP
For more application information refer to Information Note
520 - 30.
DESCRIPTION
The LE507 is a low voltage class A amplifier design, primarily
for low voltage and low power use. The broad application
include AF output stages, RF amplifiers and output stages of
the hearing instruments. The circuit is comprised of three
stages all of them having access to their collectors for
frequency shaping, feedback, etc. The provision for the bias
network and alternative gain increase to 76 dB are included on
the circuit.
VBIAS
2
(3)
V
B
1
(4)
FILTER A
4
(1)
FILTER B
8
(5)
O/P
7
(6)
I/P
5
(8)
3
(2)
GND
All external resistors in ohms, all capacitors in
µF
unless otherwise stated.
Numbers in brackets are for DIP package.
6
(7)
R
E
BLOCK DIAGRAM
Revision Date: January 2001
Document No. 500 - 52 - 09
GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3
Japan Branch: A-302, M i yamae Vi l l age, 2–10–42 M i yamae, Suginami–ku, Tokyo 168, Japan
tel. (905) 632-2996 fax: (905) 632-5946
tel. (03) 3334-7700
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