DG309B datasheet(7/15 Pages) VISHAY

Part #	DG309B

Description	Improved Quad CMOS Analog Switches

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Manufacturer	VISHAY [Vishay Siliconix]

Direct Link	http://www.vishay.com

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7 / 15 page

Document Number: 70047

S11-0303-Rev. G, 28-Feb-11

www.vishay.com

7

Vishay Siliconix

DG308B, DG309B

TEST CIRCUITS

Figure 2. Switching Time

50 %

0 V

12 V

tOFF

tON

VO

tr < 20 ns

tf < 20 ns

Logic

Input

Switch

Output

90 %

CL

35 pF

RL

1 k



VO = VS

RL + RDS(on)

RL

VS = + 3 V

VO

V-

V+

IN

S

D

12 V

- 15 V

GND

+ 15 V

Figure 3. Off Isolation

S

IN

50



D

Rg = 50 

VS

VO

0 V, 15 V

Off Isolation = 20 log

VS

VO

V+

- 15 V

GND

V-

C

+ 15 V

Figure 4. Channel-to-Channel Crosstalk

IN1

0 V, 15 V

VO

+ 15 V

- 15 V

GND

V+

V-

NC

XTALK Isolation = 20 log

C

VS

C

VO

0 V, 15 V

50



VS

S1

IN2

S2

Rg= 50 

D1

D2

C = RF bypass

50



Figure 5. Charge Injection

CL

1000 pF

Vg

12 V

D

V+

V-

Rg

- 15 V

GND

IN

S

VO

+ 15 V

VO

VO

INX

ON

OFF

VO = measured voltage error due to charge injection

The charge injection in coulombs is Q = CL x VO

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DG309B Datasheet(PDF) 7 Page - Vishay Siliconix

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