Gennum Corporation GS551 Datasheet
High Power, Class B
Output Stage
GS551 DATA SHEET
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.
V
B
6
10
C OUT 2
1
C OUT 1
3
A IN
A OUT
4
U.S. Patent No. 4,719,430
Other Patents Pending
5
- A
29
GND 1
- B
REFERENCE
VOLTAGE
GND 2
C
7
VREF DEC 1
8
DEC 2
BLOCK DIAGRAM
Revision Date: January 2001
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
Document No. 510 - 31 - 04
ABSOLUTE MAXIMUM RATINGS
PIN CONNECTION
PARAMETER VALUE/UNITS
Supply Voltage 5 VDC
Operating Temperature -10 to +40 °C
Storage Temperature -20 to +70 °C
CAUTION
A IN
A OUT
DEC 1
GND 1
C OUT 1
5
VB
6
VREF
DEC 2
GND 2
101
COUT 2
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
= 1.3 VDC
B
Gain A
Amplifier Current I
Transducer Current I
V
AMP
TRANS
VO=0.707 VRMS 46 48 50 dB
120 220 335 µA
120 250 390 µA
Input Referred Noise IRN NFB 0.2 to 10 kHz at 12 dB/Oct - 1.3 2.5 µV
Total Harmonic Distortion VO=0.707 VRMS - 0.25 1.3 %
THD
VO=1.3 VRMS - 0.3 1.5 %
Stable with RB to R
Maximum Output Current I
All parameters remain as shown in Test Circuit unless otherwise stated in "Conditions" column
C
R
S
S
10k
0.1
STAB
OUT
5
- A
100k
RB=22Ω - - 22 Ω
VP8=0 - >35 - mA
= 1.3VDC
V
B
6
10
RB = 4.7
I
OUT
V
O
- B
C
RL = 400
510 - 31 - 04
1 kHz
4
All resistors in ohms,all capacitors in farads
unless otherwise stated
REFERENCE
VOLTAGE
1
29783
0.047
0.047
Fig. 1 Test Circuit
2
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