DG641/642/643

Vishay Siliconix

www.vishay.com

S FaxBack 408-970-5600

4-8

Document Number: 70058

S-52433—Rev. E, 06-Sep-99

TEST CIRCUITS

Signal

Generator

75

W

“0”

75

W

10

W

“1”

Signal

Generator

75

W

10

W

V

(a)

DG641

(b)

DG642

V

+15 V

–3 V

V+

V–

Signal

Generator

50

W

50

W

SD

FIGURE 6. Bandwidth

75

W

X

V

OUT

V

APPLICATIONS

Device Description

The DG641/642/643 switches offer true bidirectional switching

of high frequency analog or digital signals with minimum signal

crosstalk, low insertion loss, and negligible non-linearity

distortion and group delay.

Built on the Siliconix D/CMOS process, these switches provide

excellent off-isolation with a bandwidth of around 500 MHz.

The silicon-gate D/CMOS processing also yields fast

switching speeds.

An on-chip regulator circuit maintains TTL input compatibility

over the whole operating supply voltage range shown, easing

control logic interfacing.

Circuit layout is facilitated by the interchangeability of source

and drain terminals.

Frequency Response

attenuation effect on the analog signal – which is frequency

dependent (like an RC low-pass filter). The –3 dB bandwidth

of the DG641/642/643 is typically 500 MHz (into 50

W).