DG308BDJ 데이터 시트보기 (PDF) - Vishay Semiconductors

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DG308BDJ

Improved Quad CMOS Analog Switches

Vishay Semiconductors 

APPLICATIONS

15 V

V+

+15 V

–15 V

–

LM101A

VIN

+

5 MW

5.1 MW

V–

DG309B

30 pF

–15 V

1 kW

50 pF

Aquisition Time

Aperature Time

Sample to Hold Offset

Droop Rate

= 25 ms

= 1 ms

= 5 mV

= 5 mV/s

FIGURE 7. Sample-and-Hold

DG308B/309B

Vishay Siliconix

Logic Input

Low = Sample

High = Hold

J202

+15 V

200 W

1000 pF

2N4400

J500

J507

VOUT

–15 V

fC4

Select

TTL

Control

fC3

Select

fC2

Select

fC1

Select

C4

150 pF

C3

1500 pF

C2

0.015 mF

C1

0.15 mF

+15 V

V1

V– DG309B GND

R1 = 10 kW

R2 = 10 kW

–15 V

R3 = 1 MW

+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 1 k 10 k 100 k 1 M

Frequency – Hz

AL (Voltage Gain Below Break Frequency) =

1

fC (Break Frequency) = 2pR3CX

fL (Unity Gain Frequency) =

Max Attenuation =

rDS(on)

10 kW

1

2pR1CX

[ –40 dB

R3

R1 = 100 (40 dB)

Document Number: 70047

S-52896—Rev. E, 14-Jul-97

FIGURE 8. Active Low Pass Filter with Digitally Selected Break Frequency

www.vishay.com S FaxBack 408-970-5600

4-7

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