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參數(shù)資料
| 型號： | SA571NG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 運動控制電子 |
| 英文描述： | Compandor |
| 中文描述： | DUAL COMPANDER, 0.02 MHz BAND WIDTH, PDIP16 |
| 封裝： | LEAD FREE, PLASTIC, DIP-16 |
| 文件頁數(shù)： | 6/11頁 |
| 文件大?。?/td> | 111K |
| 代理商： | SA571NG |
SA571
http://onsemi.com
6
Figure 6 shows how the circuit is hooked up to realize an
expandor. The input signal, V
IN
, is applied to the inputs of
both the rectifier and the G cell. When the input signal
drops by 6.0 dB, the gain control current will drop by a factor
of 2, and so the gain will drop 6.0 dB. The output level at
V
OUT
will thus drop 12 dB, giving us the desired 2to1
expansion.
+
GAIN
2 R
3
V
IN
(avg)
R
1
R
2
I
B
2
NOTE:
I
B
= 140 A
*EXTERNAL COMPONENTS
V
IN
V
OUT
V
REF
G
*C
IN1
*C
IN2
*C
RECT
R
3
R
4
R
1
R
2
Figure 6. Basic Expander
Figure 7 shows the hookup for a compressor. This is
essentially an expandor placed in the feedback loop of the op
amp. The G cell is setup to provide AC feedback only, so
a separate DC feedback loop is provided by the two R
DC
and
C
DC
. The values of R
DC
will determine the DC bias at the
output of the op amp. The output will bias to:
V
OUT
DC
1
R
DC1
R
DC2
R
4
V
REF
V
OUT
DC
1
R
DCTOT
30k
1.8V
The output of the expander will bias up to:
V
OUT
DC
1
R
3
R
4
V
REF
V
OUT
DC
1
20k
30k
1.8V
3.0V
The output will bias to 3.0 V when the internal resistors are
used. External resistors may be placed in series with R
3
,
(which will affect the gain), or in parallel with R
4
to raise the
DC bias to any desired value.
NOTE: GAIN
R
1
R
2
I
B
2R
3
V
INavg
1
2
I
B
= 140 A
*EXTERNAL COMPONENTS
V
IN
C
IN
C
F
R
1
R
2
R
3
V
OUT
G
*
C
RECT
*
DC
*
R
DC
*
C
DC
*
V
REF
R
4
Figure 7. Basic Compressor
*
+
Circuit Details Rectifier
Figure 8 shows the concept behind the fullwave
averaging rectifier. The input current to the summing node
of the op amp, V
IN
/R
1
, is supplied by the output of the op
amp. If we can mirror the op amp output current into a
unipolar current, we will have an ideal rectifier. The output
current is averaged by R
5
, CR, which set the averaging time
constant, and then mirrored with a gain of 2 to become I
G
,
the gain control current.
C
R
I
G
R
1
V
IN
V+
I = V
IN
/ R
1
Figure 8. Rectifier Concept
R
5
10k
+
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|---|---|
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|---|---|
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