LC551 ETC1 [List of Unclassifed Manufacturers], LC551 Datasheet
LC551
Manufacturer Part Number
LC551
Description
High Power Class B Output Stage
Manufacturer
ETC1 [List of Unclassifed Manufacturers]
Datasheet
1.LC551.pdf
(3 pages)
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• adjustable gain to 48 dB
• capable of driving low impedance receiver (110 )
• low parts count, 3 small capacitors & 1 resistor
• gain trim can be used as volume control for
• minimal start - up transient
• frequency bandwidth of 18 kHz
FEATURES
STANDARD PACKAGING
• 10 pin PLID
• Chip (80 x 61 mils)
Revision Date: January 2001
reduced noise
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996
®
A
OUT
A
IN
5
4
Web Site: www.gennum.com E-mail: hipinfo@gennum.com
U.S. Patent No. 4,719,430, other patents pending.
- A
GND 1
2
BLOCK DIAGRAM
- B
DESCRIPTION
The LC551 is a 10 pin low voltage, class B amplifier which
operates over a battery voltage range of 1.1 V
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
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.
GND 2
9
REFERENCE
VOLTAGE
7
REF DEC2 DEC1
C
8
V
Class B Output Stage
B
6
3
10
1
O/P2
O/P1
LC551 DATA SHEET
Document No. 500 - 77 - 5
High Power
DC
to 3 V
AC
gain
DC
.
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LC551 Summary of contents
Page 1
... 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 DESCRIPTION The LC551 pin low voltage, class B amplifier which operates over a battery voltage range of 1.1 V The LC551 consists of three gain blocks. The first block is an inverting amplifier with the gain set by two external resistors ...
Page 2
ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Operating Temperature Range Storage Temperature Range CAUTION CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS All switches remain as shown in Test Circuit unless stated in condition column Conditions: Supply voltage V = 1.3 V DC, ...
Page 3
... RESISTANCE ( ) Fig. 2 Power Output vs Load Resistance at 7% Distortion LC506 10K 0.1 LC551 5 50K 1.0 0.047 Fig. 3 Typical Hearing Aid Application DOCUMENT IDENTIFICATION: PRELIMINARY DATA SHEET The product preproduction phase and specifications are subject to change without notice. ...