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DG381BDJ

CMOS Analog Switches

Vishay Semiconductors 

DG381B/384B/387B/390B

Vishay Siliconix

APPLICATIONS

The DG381B series of analog switches will switch positive

analog signals while using a single positive supply. This allows

their use in applications where only one supply is available.

The trade-offs or performance given up while using single

supplies are: 1) increased rDS(on), 2) slower switching speed.

Typical curves for aid in designing with single supplies are

supplied (see Typical Characteristics). The analog voltage

should not go above or below the supply voltages which in

single operation are V+ and 0 V.

In the integrator of Figure 4, RD controls the discharge rate of

the capacitor so that the pulsed or continuous current ratings

are not exceeded. During reset SW1 is closed and SW2 is

open. Opening SW2 with SW1 also open will hold the integrator

output at its present value.

Reset

VIN

Start/Stop

SW1

SW2

DG381B

RD

C

R

–

+

R

ŕ 1

VO + RC VIN ·Ădt

FIGURE 5. Integrator with Reset and Start/Stop

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Document Number: 71404

S-02968—Rev. A, 22-Jan-01

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