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SA572DTBR2G Datasheet(PDF) 9 Page - ON Semiconductor

Part # SA572DTBR2G
Description  Programmable Analog Compandor
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

SA572DTBR2G Datasheet(HTML) 9 Page - ON Semiconductor

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SA572
http://onsemi.com
9
BUFFER
D
G
10 mF
2.2 mF
C3
VIN
VOUT
Figure 9. Automatic Level Control
R3
17.3k
9.1k
9.1k
RDC1
R4
RDC2
CDC
C5
R5
5532
+
VOUT
100k
+
22 mF
CA
+
1 mF
CR
+
10 mF
+
2.2 mF
C2
+
2.2 mF
+
2.2 mF
C1
+
R1
3.3k
RX
6.8k
ATTACK
CAP
RECOVERY
CAP
V+
V−
TO THD
TRIM PIN
OF 572
PINS 6, 10
1k
+
3, 13
4, 12
5, 11
2, 14
7, 9
DC
1
2
3
R2
Automatic Level Control (ALC)
In the ALC configuration, the variable gain cell is placed
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 decreases proportionally, holding the output
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.
Gain +
R1 R2 I1
2R3 VIN(avg)
where:
R1 = 6.8 kW (Internal)
R2 = 3.3 kW
R3 = 17.3 kW
I1 = 140 mA
The output DC level can be set using the following
equation:
V
OUT DC +
1 )
R
DC1 ) RDC2
R4
VREF
where:
R4 = 100 kW
RDC1 = RDC2 = 9.1 kW
VREF = 2.5 V
The output level is calculated using the following
equation:
VOUT_LEVEL +
R1 R2 I1
2R3
VIN
VIN (avg)
where:
R1 = 6.8 kW (Internal)
R2 = 3.3 kW
R3 = 17.3 kW
I1 = 140 mA
VIN
VIN (avg)
+ p
22
+ 1.11 (for sine waves)
Note that for very low input levels, ALC may not be
desired and to limit the maximum gain, resistor RX has
been added.
Gain max. +
R1)Rx
VREF ·R2 ·IB
2R3
Rx ^ ((desired max gain)
26 kW) * 10 kW


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