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| 型號： | SA572NG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 運動控制電子 |
| 英文描述： | Programmable Analog Compandor |
| 中文描述： | DUAL COMPANDER, PDIP16 |
| 封裝： | LEAD FREE, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 224K |
| 代理商： | SA572NG |
SA572
http://onsemi.com
9
BUFFER
G
10 F
2.2 F
C
3
V
IN
V
OUT
Figure 9. Automatic Level Control
R
3
17.3k
9.1k
9.1k
R
DC1
R
4
R
DC2
C
DC
C
5
R
5
5532
+
V
OUT
100k
+
22 F
C
A
+
1 F
C
R
+
10 F
+
2.2 F
C
2
+
2.2 F
+
2.2 F
C
1
+
R
1
3.3k
R
X
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
R
2
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.
R1R2I1
2 R3VIN(avg)
where:
R
1
= 6.8 k (Internal)
R
2
= 3.3 k
R
3
= 17.3 k
I
1
= 140 A
Gain
The output DC level can be set using the following
equation:
V
OUT
DC
1
R
DC1
R
DC2
R
4
V
REF
where:
R
4
= 100 k
R
DC1
= R
DC2
= 9.1 k
V
REF
= 2.5 V
The output level is calculated using the following
equation:
VOUT_LEVEL
R1R2I1
2 R3
VIN
VIN(avg)
where:
R
1
= 6.8 k (Internal)
R
2
= 3.3 k
R
3
= 17.3 k
I
1
= 140 A
VIN
VIN(avg)
2 2
1.11 (for sine waves)
Note that for very low input levels, ALC may not be
desired and to limit the maximum gain, resistor R
X
has
been added.
Gain max.
R1
VREF
Rx
· R2· IB
2 R3
Rx
((desired max gain)
26 k )
10 k
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