LC551 Datasheet, PDF (1/3 Pages) List of Unclassifed Manufacturers – High Power Class B Output Stage

High Power
Class B Output Stage
LC551 DATA SHEET
FEATURES
DESCRIPTION
• adjustable gain to 48 dB
The LC551 is a 10 pin low voltage, class B amplifier which
• capable of driving low impedance receiver (110 Ω)
• low parts count, 3 small capacitors & 1 resistor
D _{• gain trim can be used as volume control for}
E _{reduced noise}
D ^{• minimal start - up transient}
N ^{S • frequency bandwidth of 18 kHz}
E ^N STANDARD PACKAGING
M _IG ^{• 10 pin PLID ®}
• Chip (80 x 61 mils)
operates over a battery voltage range of 1.1 V DC to 3 V DC.
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.
RECEOWM ^DES ₅
TA_IN
-A
NOFOR ^N _{AOUT 4}
V_B
6
-B
C
REFERENCE
VOLTAGE
10
O/P2
O/P1
1
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. [phone]
Web Site: www.gennum.com E-mail: [e-mail]