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參數(shù)資料
| 型號： | SA571NG |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 8/11頁 |
| 文件大小： | 0K |
| 描述： | IC COMPANDOR DUAL GAIN 16-DIP |
| 標(biāo)準(zhǔn)包裝： | 25 |
| 類型： | 壓縮擴(kuò)展器 |
| 應(yīng)用： | 蜂窩式無線電，播放器 |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 16-DIP（0.300"，7.62mm） |
| 供應(yīng)商設(shè)備封裝： | 16-DIP |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1131 (CN2011-ZH PDF) |
| 其它名稱： | SA571NG-ND SA571NGOS |
SA571
http://onsemi.com
6
Figure 6 shows how the circuit is hooked up to realize an
expandor. The input signal, VIN, is applied to the inputs of
both the rectifier and the
DG 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
VOUT will thus drop 12 dB, giving us the desired 2to1
expansion.
+
GAIN
+
2R
3 VIN (avg)
R
1 R2 IB
2
NOTE:
IB = 140mA
*EXTERNAL COMPONENTS
VIN
VOUT
VREF
DG
*CIN1
*CIN2
*CRECT
R3
R4
R1
R2
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
DG cell is setup to provide AC feedback only, so
a separate DC feedback loop is provided by the two RDC and
CDC. The values of RDC will determine the DC bias at the
output of the op amp. The output will bias to:
V
OUT DC +
1
)
R
DC1 ) RDC2
R
4
V
REF
V
OUT DC +
1
)
R
DCTOT
30k
W
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
) 20kW
30k
W
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 R3,
(which will affect the gain), or in parallel with R4 to raise the
DC bias to any desired value.
NOTE: GAIN
+
R
1 R2 IB
2R
3 VINavg
1
2
IB = 140mA
*EXTERNAL COMPONENTS
VIN
CIN
CF
R1
R2
R3
VOUT
DG
*
CRECT *
RDC *
CDC *
VREF
R4
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, VIN/R1, 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 R5, CR, which set the averaging time
constant, and then mirrored with a gain of 2 to become IG,
the gain control current.
CR
IG
R1
VIN
V+
I = VIN / R1
Figure 8. Rectifier Concept
R5
10k
W
+
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