Document Number: 70051

S-71241–Rev. F, 25-Jun-07

www.vishay.com

9

Vishay Siliconix

DG417/418/419

TEST CIRCUITS

APPLICATIONS

Switched Signal Powers Analog Switch

The analog switch in Figure 10 derives power from its input

signal, provided the input signal amplitude exceeds 4 V and

its frequency exceeds 1 kHz.

This circuit is useful when signals have to be routed to either

of two remote loads. Only three conductors are required: one

for the signal to be switched, one for the control signal and a

common return.

chip; operation is satisfactory because the switch requires

less than 1 µA of stand-by supply current. Loading of the

signal source is imperceptible. The DG419’s on-resistance is

a low 100

Ω for a 5 V input signal.

Figure 9. Source/Drain Capacitances

IN

S

V+

D

f = 1 MHz

- 15 V

GND

V-

C

0 V, 2.4 V

Meter

HP4192A

Impedance

Analyzer

or Equivalent

+ 5 V

C

+ 15 V

C

f = 1 MHz

+ 15 V

IN

NC

GND

V+

C

C

0 V, 2.4 V

Meter

HP4192A

Impedance

Analyzer

or Equivalent

DG417/418

DG419

IN

S

D

f = 1 MHz

GND

C

0 V, 2.4 V

CC

f = 1 MHz

IN

NC

- 15 V

GND

V+

V-

C

C

0 V, 2.4 V

Meter

HP4192A

Impedance

Analyzer

or Equivalent

Figure 10. Switched Signal Powers Remote SPDT Analog Switch

Input

Control

GND

DG419

V-

0.01 µF

10 k

Ω

10 k

Ω

D

IN

V+