SA572D ON Semiconductor, SA572D Datasheet - Page 9

• Manufacturer Part Number: SA572D
• Description: IC COMPANDOR 2CHAN GAIN 16-SOIC
• Manufacturer: ON Semiconductor
• Type: Compandorr

Specifications of SA572D

• Applications: Automatic Level Control, Stereo Expander
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (0.300", 7.50mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Automatic Level Control (ALC)
in the feedback loop of the operational amplifier and the
rectifier is connected to the input. As the input amplitude
increases above the crossover point, the overall system
gain
amplitude constant. As the input amplitude decreases
below the crossover point, the overall system gain
increases proportionally, holding the output amplitude at
the same constant level.
where:
equation:
where:
In the ALC configuration, the variable gain cell is placed
The output DC level can be set using the following
decreases proportionally, holding the output
V
V
OUT
IN
R
R
R
I
R
R
V
1
1
2
3
4
DC1
DC +
REF
= 140 mA
= 6.8 kW (Internal)
= 3.3 kW
= 17.3 kW
= 100 kW
PINS 6, 10
TRIM PIN
Gain +
= R
= 2.5 V
TO THD
OF 572
DC2
1 )
2.2 mF
2.2 mF
C
C
2 R 3 V IN (avg)
= 9.1 kW
1
3
+
+
R 1 R 2 I 1
R
DC1
R
R
X
) R
4
17.3k
100k
R
R
R
1k
4
5
3
DC2
ATTACK
CAP
C
A
Figure 9. Automatic Level Control
+
V
3.3k
REF
R
1 mF
1
C
5
+
http://onsemi.com
22 mF
3, 13
4, 12
5, 11
R
9.1k
DC1
2
3
9
D
G
−
+
BUFFER
5532
equation:
where:
desired and to limit the maximum gain, resistor R
been added.
+
V+
V−
The output level is calculated using the following
Note that for very low input levels, ALC may not be
6.8k
R
10 mF
C
2
R x ^ ((desired max gain)
DC
R
9.1k
DC2
1
V OUT_LEVEL +
2, 14
7, 9
V IN (avg)
V
R
R
R
I
1
Gain max. +
OUT
1
2
3
2.2 mF
V IN
= 140 mA
= 6.8 kW (Internal)
= 3.3 kW
= 17.3 kW
C
2
+
DC
C
+ p
R
+
2 2
RECOVERY
CAP
R 1 R 2 I 1
R 1 )R x
V REF
10 mF
2.2 mF
+ 1.11 (for sine waves)
2 R 3
2 R 3
+
· R 2 · I B
26 kW) * 10 kW
V IN (avg)
V IN
V
OUT
X
has