GL504 Ver la hoja de datos (PDF) - Gennum -> Semtech

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GL504

Low Current Preamplifier with Output Limiting

Gennum -> Semtech 

FEATURES

• designed to drive class D integrated receivers

• MPO range externally adjustable

• 150 µA typical current drain

• 46 dB of adjustable gain

• low external parts count

STANDARD PACKAGING

• 8 Pin MICROpac

• 8 Pin PLID®

• 8 Pin SLT

• Chip (56 x 56 mils)

Au Bump

Low Current Preamplifier

with Output Limiting

GL504 - DATA SHEET

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.

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.

R MIC 6

R MIC

AIN 5

A

7 VB

R PULL

B

8 B OUT

R CLIP

U.S. Patent No. 07/354,327

4

A OUT

3

B IN

BLOCK DIAGRAM

2

MPO

1

GND

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

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