Low Current Preamplifier
with Output Limiting
GL504 - DATA SHEET
FEATURES
•
designed to drive class D integrated receivers
•
MPO range externally adjustable
•
150
µ
A typical current drain
•
46 dB of adjustable gain
•
low external parts count
Composed of two stages, an inverting preamp with gain of
28 dB, and a transconductance block with gain of 18 dB, the
GL504 is easily configured for mid-supply reference as
required by the class D receivers.
The two stages of the GL504 must be AC coupled in order to
maintain the DC bias conditions of each stage. Also, a 48
kΩ resistor, between the output and ground, is used to keep
the receivers at mid-supply reference. The minimal total parts
count, excluding an MPO variable resistor, requires 3
capacitors, a 100 kΩ volume control and the 48 kΩ bias
resistor at the output.
The GL504 is capable of providing a flat frequency response
with very little distortion.
DESCRIPTION
The GL504 is a low current preamplifier designed to drive
the class D series of integrated receivers. This preamp has a
built-in symmetrical peak clipping output limiter, 46 dB of
adjustable gain, and requires few external components.
STANDARD PACKAGING
• 8 Pin MICROpac
• 8 Pin PLID
• 8 Pin SLT
• Chip (56 x 56 mils)
Au Bump
®
R
MIC
6
R
MIC
7
V
B
R
A
IN
5
PULL
A
B
8
B
OUT
R
CLIP
4
U.S. Patent No. 07/354,327
3
B
IN
2
MPO
1
GND
A
OUT
BLOCK DIAGRAM
Revision Date: May 1998
Document No. 510 - 99 - 06
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
GENNUM [ GENNUM CORPORATION ]
