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8

Document Number: 70037

S-71155–Rev. H, 11-Jun-07

Vishay Siliconix

DG201B/202B

APPLICATIONS

Figure 6. Sample-and-Hold

LM101A

+ 15 V

- 15 V

30 pF

+ 15 V

- 15 V

V+

V-

DG201B

50 pF

1000 pF

J202

J500

J507

+ 15 V

2N4400

- 15 V

1 k

Ω

200

Ω

5 M

Ω

5.1 M

Ω

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

–

+

Figure 7. Active Low Pass Filter with Digitally Selected Break Frequency

TTL

Control

150 pF

1500 pF

+ 15 V

DG201B

GND

30 pF

LM101A

+ 15 V

- 15 V

1

10

100

1 k

10 k

100 k

1 M

- 40

0

160

120

80

Select

Select

Select

Select

V-

= 100 (40 dB)

1

2

1

2

Max Attenuation =

10 k

Ω

0.015 µF

0.15 µF

- 15 V

–

+

40

f - Frequency (Hz)