DG308B_11 Datasheet, PDF (8/15 Pages) Vishay Siliconix – Improved Quad CMOS Analog Switches

DG308B, DG309B
Vishay Siliconix
APPLICATIONS
V_IN1
+5V
V_L
+ 15 V
V+
V_IN2
CH
GND
DG419
V-
30 pF
+ 15 V
+
LM101A
-
- 15 V
DG308B
+ 15 V
R_F1
18 k
R_F1
9.9 k
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
V-
- 15 V
R_g1
2 k
R_g2
100 
GND
Figure 6. A Precision Amplifier with Digitally Programmable Inputs and Gains
15 V
V+
R_F1
100 k
R_g3
100 
+ 15 V
- 15 V
-
LM101A
V_IN
+
5 M
5.1 M
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 k
50 pF
Logic Input
Low = Sample
High = Hold
J202
+ 15 V
200 
1000 pF
2N4400
J500
J507
V_OUT
- 15 V
Figure 7. Sample-and-Hold
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Document Number: 70047
S11-0303-Rev. G, 28-Feb-11