SA572 Philips, SA572 Datasheet - Page 8

• Manufacturer Part Number: SA572
• Description: Programmable analog compandor
• Manufacturer: Philips

Philips Semiconductors
Basic Compressor
Figure 8 shows the hook-up of the circuit as a compressor. The IC is
put in the feedback loop of the OPA A
is as follows:
R
level of A
The zener diodes D
protection.
1998 Nov 03
V
V
V
DC1
OUT
ODC
Programmable analog compandor
IN
, R
V
DC2
IN
1
V
is given by
, and CDC form a DC feedback for A
REF
V
I
2
1
B
C
2.2 F
IN1
1
R
R
3
1
R
DC1
and D
2
V
R
IN(AVG)
DC1
R
R
R5
100k
4
1
2
R
R
are used for channel overload
DC2
4
–
+
R
1
2
A1
DC2
1
. The system gain expression
(7)
(8)
1
. The output DC
2.2 F
C
C
IN3
R2
3.3k
IN2
Figure 7. Basic Expandor Schematic
(3,13)
(7,9)
(8)
6.8k
R1
BUFFER
G
8
(16)
V
V
REF
IN
+V
CC
+VB
(6,10) R6
(4,12)
C
2.2 F
(5,11)
(2,14)
IN1
1 F
CA
1k
R4
Figure 8. Basic Compressor Schematic
17.3k
R4
R3
10 F
10 F
CR
CR
(2,14)
C1
1 F
(5,11)
CA
(4,12)
C2
2.2 F
C1
.1 F
(8)
RDC1
A2
1k
(6,10)
9.1k
17.3k
R3
–
+
R5
BUFFER
V
A1
REF
G
V
10 F
CDC
CC
D1
6.8k
R1
(16)
Product specification
RDC2
9.1k
D2
(7,9)
(3,13)
3.3k
R2
2.2 F
C
SA572
SR00700
IN2
V
OUT
SR00701
V
OUT
2.2 F
C
IN3