GM3008 Datasheet, PDF (1/7 Pages) Gennum Corporation – Stand Alone Class B Hybrid

FEATURES
• up to 80 dB of electrical gain
• dedicated preamp for a telecoil
• direct coupling of a telecoil to preamp
• low input referred noise
• on chip voltage regulator
• capable of driving low impedance receivers
STANDARD PACKAGING
• 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)
Stand Alone
Class B Hybrid
GM3008 - HYB DATA SHEET
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 µA 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.
V_{REG 11}
3
C1
3µ3
2
V_{BT 16}
+
T_{REF 15}
1^-
T_IN 14
11 _{- T}
4
REGULATOR
-A
GP537
GM3008
GS551
-B
5
5 _-C
T_OUT 13
INPUT 10
MGND ¹²
9
10 ⁸
R2
C2
R1
105k
47n 18k2
7
6
R3
20k
17
A_IN
All resistors in ohms, all capacitors
in farads unless otherwise stated.
18
7
A_OUT
B_IN
2
4
R5
60k
R4 15k
C3 47n
9
8
6
B_OUT C_F C_IN
5
C_OUT
FUNCTIONAL BLOCK DIAGRAM
6
-D
REFERENCE
VOLTAGE
9
7
1
E
10
83
1
PGND
C4
47n
C5
47n
4 _{OUT 1}
3 V_CC
2 OUT 2
Revision Date: May 1998
Document No. 520 - 70 - 05
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. [phone]
Web Site: www.gennum.com E-mail: [e-mail]