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| DG211B_11 Datasheet, PDF (7/13 Pages) Vishay Siliconix – Improved Quad CMOS Analog Switches | |||
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APPLICATIONS
+ 15 V
- 15 V
-
LM101A
VIN
+
5 MΩ
5.1 MΩ
30 pF
Aquisition Time
Aperature Time
Sample to Hold Offset
Droop Rate
= 25 µs
= 1 µs
= 5 mV
= 5 mV/s
DG211B, DG212B
Vishay Siliconix
+5V
VL
+ 15 V
V+
DG211B
V-
- 15 V
1 kΩ
Logic Input
Low = Sample
High = Hold
+ 15 V
50 pF
J202
200 W
1000 pF
2N4400
J500
VOUT
J507
- 15 V
Figure 6. Sample-and-Hold
fC4
Select
TTL
Control
fC3
Select
fC2
Select
fC1
Select
C4
150 pF
C3
1500 pF
C2
0.015 µF
C1
0.15 µF
+ 15 V
V1
V- DG211B GND
R1 = 10 kΩ
R2 = 10 kΩ
- 15 V
R3 = 1 MΩ
+ 15 V
-
LM101A
- 15 V
+
30 pF
VOUT
160
120
80
fC1
40
fC2 fC3 fC4
0
fL1
fL2
fL3
fL4
- 40
1
10
100
1K
10K 100K 1M
Frequency - Hz
AL (Voltage Gain Below Break Frequency) =
1
R3
R1
= 100 (40 dB)
fC (Break Frequency) = 2ÏR3CX
1
fL (Unity Gain Frequency) = 2ÏR1CX
RDS(on)
Max. Attenuation =
â - 47 dB
10 kΩ
Figure 7. Active Low Pass Filter with Digitally Selected Break Frequency
Document Number: 70040
S11-0179-Rev. J, 07-Feb-11
www.vishay.com
7
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