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參數(shù)資料
| 型號： | DG221DY-T1 |
| 廠商： | VISHAY SILICONIX |
| 元件分類： | 多路復(fù)用及模擬開關(guān) |
| 英文描述： | QUAD 1-CHANNEL, SGL POLE SGL THROW SWITCH, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大小： | 65K |
| 代理商： | DG221DY-T1 |
DG221
6
Siliconix
S-52881—Rev. C, 28-Apr-97
Applications
Figure 8.
P-Controlled Analog Signal Attenuator
+15 V
GND
DG221
–15 V
V+
S
4
D
4
S
3
D
3
S
2
D
2
S
1
D
1
IN
1
V–
D
C
Q
IN
2
D
C
Q
IN
3
D
C
Q
IN
4
D
C
Q
V
IN
900 k
9 M
90 k
9 k
1 k
+
TL081
–
V
O
WR
Address
Decoder
CS
Address Bus
WR
Data Bus
The TL081 is used as an output buffer while
the voltage divider provides attenuation.
Truth Table
Output Attenuation for Figure 8
IN
1
IN
2
IN
3
IN
4
WR
a
On
Switch
WR
IN
1
IN
2
IN
3
IN
4
Gain
0
0
0
0
0
All
0
0
1
1
1
0.1
1
1
1
1
0
None
0
1
0
1
1
0.01
0
1
1
1
0
1
0
1
1
0
1
0.001
1
0
1
1
0
2
0
1
1
1
0
0.0001
1
1
0
1
0
3
1
1
1
0
0
4
Notes:
a.
WR may be held at “0” for temporary operation similar to DG201A/DG201B. With WR at “0” SW
1
will remain on as long as IN
1
is held at
“0”.
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