Stand Alone
Class B Hybrid
GM3008 - HYB DATA SHEET
FEATURES
鈥?up to 80 dB of electrical gain
鈥?dedicated preamp for a telecoil
鈥?direct coupling of a telecoil to preamp
鈥?low input referred noise
鈥?on chip voltage regulator
鈥?capable of driving low impedance receivers
DESCRIPTION
The GM3008 hybrid consists of two of Gennum's proprietary
integrated circuits, the GP537 preamplifier and the GS551
class B output driver. Such a configuration provides up to
80 dB (typ) of electrical gain. Low total harmonic distortion
and input noise make this circuit well suited for high power
applications. Various additional pads have been provided
to allow for maximum flexibility of system performance.
The GP537 contains two low noise inverting preamplifiers
with an open loop voltage gain of typically 50 dB, a telecoil
preamplifier with its own reference voltage which enables
for direct coupling of the telecoil and a voltage regulator
with typically 74 dB of supply rejection capable of working
with a supply voltage down to 1.1 volts. This chip also
enables the user to disconnect the telecoil preamplifier
when it is not required, thereby saving approximately
85
碌A(chǔ)
of current.
The GS551 class B amplifier contains three basic blocks,
a low noise inverting preamplifier, a unity gain phase
splitter and a fixed gain class B output stage.
STANDARD PACKAGING
鈥?Hybrid typical dimensions
0.250 in x 0.150 in x 0.115 in
(6.35 mm x 3.81 mm x 2.92 mm)
4
GM3008
GP537
GS551
6
V
REG 11
V
BT 16
T
REF 15
T
IN 14
3
C1
3碌3
REGULATOR
2
1
11
+
-
1
5
4
3
-
C
-
D
E
10
REFERENCE
VOLTAGE
2
OUT 1
V
CC
OUT 2
-
T
8
-
A
10
7
6
-
B
5
9
2
4
9
7
8
3
R2
T
OUT
INPUT
13
R3
20k
R4
C3
15k
47n
8
6
R5
60k
C2
10
R1
18k2
17
105k
C4
47n
C5
47n
5
1
MGND
12
47n
18
7
9
A
IN
All resistors in ohms, all capacitors
in farads unless otherwise stated.
A
OUT
B
IN
B
OUT
C
F
C
IN
C
OUT
PGND
FUNCTIONAL BLOCK DIAGRAM
Revision Date: May 1998
Document No. 520 - 70 - 05
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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