GL6552
1
V
REF
EXP IN
VCC
EXP RECT
ALC
EXP OUT
IN
COMP OUT
C-ACF
COMP RECT
GND
COMP NF
GL6552
EXP MUTE
COMP MUTE
COMP IN
14 DIP, 14 SOP(150mil)
GL6552
Low Voltage Compander
General Descriptions
The GL6552 is a Compander IC, which
contains two variable gain circuits configured
for compressing and expanding the dynamic
range, and improving of S/N ratio of audio
signal. It consists of compressor, expander, Mic
Amp, limiter, ALC(Automatic Level
Control)and mute logic. The compressor circuit
has the 2/1 ratio of input/output ratio by
logarithm, and the expander circuit by
logarithm. An internal, temperature stable
bandgap reference provides the necessary
precision voltage and current. Applications
include cordless telephone and most voice RF
links.
Features
Operating Supply Voltage: 2 ~ 6 V
Built in ALC circuit
Built in Mute logic circuit
Easy gain control to use external component
Pin Configuration
Absolute Maximum Ratings(Ta = 25
.
)
Parameter
Symbol
Spec.
Unit
Remark
Max. Supply Voltage
V
CC, MAX
7
V
Power Dissipation
P
D.MAX
600
mW
Storage Temperature
T
STG
-55 ~+150
Stress above those listed under "Absolute Maximum Rating" may cause permanent damage of device.
This is stress rating only and functional operation of the device at these or any other conditions above
those indicated in the operational sections of this specification is not implied.
Exposure to absolute maximum rating conditions for longer periods may affect device reliability.
During overload conditions (V
IN
> V
CC
or V
IN
<GND), those voltage on V
CC
pins with respect to ground
must not exceed the values defined by the absolute maximum ratings.
Operating Conditions (Ta = 25
)
Parameter
symbol
Spec.
Unit
Remark
Operating Voltage
V
OP
2 ~ 6
V
Operating Temperature
T
OP
-20 ~ +70
GL6552
3
Pin Description
No.
Symbol
Function
1 V
REF
Output terminal of bias circuit (Band Gap of reference). It is an internal
reference voltage used for supplying a constant voltage to the compressor
and the expander.
2 EXP IN
Expander input terminal
3 EXP RECT
External rectifing capacitor is connected to this terminal. Attack and decay
time of expander is determined by capacitor.
4 EXP OUT
Expander output terminal
5
MUTE
EXP
It is an expander mute terminal of a compander.
"L" state expander mute is executed.
"H" state expander is executed.
6
MUTE
COMP
It is an compander mute terminal of a compander.
"L" state compressor mute is executed.
"H" state compressor is executed.
7 GND
Ground terminal
8 COMP IN
Compressor Mic Amp noninverting input terminal. It is used as input
terminal for voice signal.
9 COMP NF
Compressor Mic Amp inverting input terminal. It is used for determining
Mic Amp gain by resistor
10 COMP RECT
External rectifing capacitor is connected to this terminal. Attack and decay
time of expander is determined by capacitor.
11 C-ACF
Feedback coupling capacitor is connected to this terminal. Low cut-off
frequency of compressor is determined by this capacitor.
12 COMP OUT
Compressor output terminal.
13 ALC
It is a reference voltage input terminal of ALC. ALC circuit may be turned
off according to the ALC reference voltage.
14 VCC
Supply voltage terminal
GL6552
4
Electrical Characteristics (VCC=3V, f=1KHz, Ta=25
unless otherwise specified)
SPEC.
PARAMETER
SYMBOL
MIN. TYP. MAX.
UNIT
CONDITION
DC Electrical Characteristics
Power Supply Current
I
cc
- 3.6
6 mA
No Signal
Reference voltage
V
REF
0.9
1
1.1
V
No Signal
Compressor part
Standard Output Voltage
V
OC
240 300 340 mVrms V
INC
=13mVrms (=0dB)
Gain Difference
Gc1
-1.0
0
1.0
dB V
INC
= -20dB
T.H.D
THDc
- 0.5
1
%
V
INC
=0dB, V
CC
=-3V
Mute Attenuation Ratio
ATTc
60
80
-
dB
V
INC
=0dB
Max. Output Voltage
V
CMAX
1.15 1.35
1.5 Vp-p V
INC
=Variable
ALC
V
ALCO
280 325 360 mVrms V
PIN13
=0.9V
Expander part
Standard Output Voltage
V
OE
110 130 160 mVrms V
INE
=180mVrms (=0dB)
G
E1
-0.5
0
0.5
dB
V
INE
=-10dB
Gain Difference
G
E1
-1.0
0
1.0
dB
V
INE
=-20dB
T.H.D
THD
E
- 0.5
1.5
%
V
INE
=0dB
Mute Attenuation Ratio
ATT
E
60
85
- dB
V
INE
=0dB
Max. Output Voltage
V
EMAX
500 600
- mVrms V
INE
=Variable
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