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8

Document Number: 70047

S11-0303-Rev. G, 28-Feb-11

Vishay Siliconix

DG308B, DG309B

APPLICATIONS

Figure 6. A Precision Amplifier with Digitally Programmable Inputs and Gains

Gain =

Gain 1 (x 1)

Gain 2 (x 10)

Gain 3 (x 100)

Gain 4 (x 1000)

- 15 V

+ 15 V

- 15 V

GND

DG419

30 pF

+ 15 V

+ 15 V

- 15 V

DG308B

Logic High = Switch On

+

-

LM101A

CH

18 k



9.9 k



100 k



100



100



2 k



V+

V-

GND

V-

+ 5 V

Figure 7. Sample-and-Hold

LM101A

+ 15 V

- 15 V

30 pF

15 V

- 15 V

V+

V-

DG309B

50 pF

1000 pF

J202

J500

J507

+ 15 V

2N4400

- 15 V

1 k



200



5 M



5.1 M



Aquisition Time

= 25 µs

Aperature Time

= 1 µs

Sample to Hold Offset

= 5 mV

Droop Rate

= 5 mV/s

Logic Input

Low = Sample

High = Hold

-

+