Philips Semiconductors
Product specification
Compandor
SA571
DESCRIPTION
The SA571 is a versatile low cost dual gain control circuit in which
either channel may be used as a dynamic range compressor or
expandor. Each channel has a full-wave rectifier to detect the
average value of the signal, a linerarized temperature-compensated
variable gain cell, and an operational amplifier.
The SA571 is well suited for use in cellular radio and radio
communications systems, modems, telephone, and satellite
broadcast/receive audio systems.
PIN CONFIGURATION
D, and N Packages
1
RECT CAP 1
RECT IN 1
AG CELL IN 1
GND
INV. IN 1
RES. R
3
1
OUTPUT 1
THD TRIM 1
1
2
3
4
5
6
7
8
16 RECT CAP 2
15
RECT IN 2
14 AG CELL IN 2
13 V
CC
12 INV. IN 2
11
RES. R
3
2
FEATURES
•
Complete compressor and expandor in one IChip
•
Temperature compensated
•
Greater than 110dB dynamic range
•
Operates down to 6VDC
•
System levels adjustable with external components
•
Distortion may be trimmed out
•
Dynamic noise reduction systems
•
Voltage-controlled amplifier
10 OUTPUT 2
9
THD TRIM 2
TOP VIEW
NOTE:
1. SOL - Released in Large SO Package Only.
SR00675
Figure 1. Pin Configuration
APPLICATIONS
•
Cellular radio
•
High level limiter
•
Low level expandor—noise gate
•
Dynamic filters
•
CD Player
TEMPERATURE RANGE
-40 to +85°C
-40 to +85°C
ORDER CODE
SA571D
SA571N
DWG #
SOT162-1
SOT38-4
ORDERING INFORMATION
DESCRIPTION
16-Pin Plastic Small Outline Large (SOL)
16-Pin Plastic Dual In-Line Package (DIP)
BLOCK DIAGRAM
THD TRIM
∆G
IN
R2 20k
VARIABLE
GAIN
V
REF
R4 30k 1.8V
RECT IN
R1 10k
RECTIFIER
R3
R3 20k
–
OUTPUT
+
INVERTER IN
RECT CAP
SR00676
Figure 2. Block Diagram
1997 Aug 14
2
853-0812 18285
PHILIPS [ NXP SEMICONDUCTORS ]
