DG308B Datasheet, PDF (8/10 Pages) Vishay Siliconix – Improved Quad CMOS Analog Switches

DG308B/309B
Vishay Siliconix
APPLICATIONS
V_IN1
+5V
V_L
+ 15 V
V+
V_IN2
CH
GND
DG419
V-
30 pF
+ 15 V
+
LM101A
-
- 15 V
Gain =
R_F + R_G
R_G
- 15 V
Gain 1 (x 1)
Gain 2 (x 10)
Gain 3 (x 100)
Gain 4 (x 1000)
Logic High = Switch On
DG308B
V-
- 15 V
+ 15 V
R_F1
18 kΩ
R_F1
9.9 kΩ
R_F1
100 kΩ
R_G1
2 kΩ
R_G2
100 Ω
R_G3
100 Ω
GND
Figure 6. A Precision Amplifier with Digitally Programmable Inputs and Gains
15 V
V+
+ 15 V
- 15 V
-
LM101A
V_IN
+
5 MΩ
5.1 MΩ
V-
DG309B
30 pF
- 15 V
Aquisition Time
Aperature Time
Sample to Hold Offset
Droop Rate
= 25 µs
= 1 µs
= 5 mV
= 5 mV/s
1 kΩ
50 pF
Logic Input
Low = Sample
High = Hold
J202
+ 15 V
200 Ω
1000 pF
2N4400
J500
J507
V_OUT
- 15 V
Figure 7. Sample-and-Hold
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8
Document Number: 70047
S-71241–Rev. F, 25-Jun-07