HEI GL6551 Datasheet

1

COMP REF

DATA INC-ACF

COMP NF

COMP IN

GND

1 2 4 3 5

6

7 9 8

18

10

20

19

17

16

15

13

11

12

14

Description

The GL6551 is a compander IC to expand
dynamic range at transmission/reception
systems and to improve the tone quality by
means of restricting noise. Two functions are
loaded on the IC, the one is the compressor
which has the 2/1 ratio of input/output ratio by
logarithm, and the expander which has the 1/w
ratio input/ output ratio by logarithm. The
GL6551equipped with input & filter Amp,
DATA IN OUT terminal. The GL6551 is well
suited for use in cellular radio MCA and handy
telephone set, radio communication systems.

Features

• Low operating supply voltage.

• Equipped with mute function and through function.

• Equipped with compressor MIC Amp and Expander

INPUT Amp

• Equipped with Filter Buffer Amp

• Equipped with DATA IN OUT terminal.

• Operation Voltage (2.4 ~ 7.0V)

• Total gain (10~ 100dB)

Maximum Ratings

Pin Configuration

FIL OUT

FIL IN

COMP OUT

COMP RECT

GL 6551

GL 6551

COMPANDER

VCC

EXP OUT

EXP RECT
DATA OUT

EXP NF

EXP IN

EXP REF

EXP MUTE

THROUGH

COMP MUTE

Parameter symbol Spec. Unit Remark
Supply Voltage V
Power Dissipation P
Storage Temperature T

CC, MAX

350 mW

D.MAX

-5 ~ 125

STG

10 V

Operating Conditions

Parameter symbol Spec. Unit Remark
Operating Voltage V

OP

Operating Temperature TOP -30 ~ 70

2.4 ~ 7 V

¡É

¡É

2

Block Diagram

GND

EXP

MUTE

THROUGH

COMP

MUTE

EXP OUT

EXP RECT

DATA RECT

3 4 5

14

20

1 2 9

12

11

13

17

18

19

10

15

16

6 7 8

−

+

-

+

REGULATOR

S/W CONTROL

MUTE
GAIN CELL

RECTIFIER

GAIN CELL

MUTE

- + -

+

RECTIFIER

-

+

C

DATA IN

COMP IN

FILTER IN

VCC

COMP REF
EXP REF

FILTER OUT

EXP NF

EXP IN
COMP RECT

COMP IN

COMP NF

EXPANDER
COMPRESSOR

100K

100K

100K

3.3K

100K

MIC

INPUTAMP

TH S/W

TH S/W

SUM AMP

SUM AMP

BUFFER AMP

GL 6551

+

−

REF

To V

IDC

30K

-ACF
30K

15K

51K

REF

To V

20K

-AMP

REF

To V

15K

Ith

30K

20K

REF

Ith

To V

10K