DG508A 데이터 시트보기 (PDF) - Vishay Semiconductors

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DG508A

Single 8-Ch/Differential 4-Ch CMOS Analog Multiplexers

Vishay Semiconductors 

TEST CIRCUITS

DG508A_MIL/509A_MIL

Vishay Siliconix

+15 V

VS

S1

V+

Rg = 50 W

A0

A1

A2

GND EN

D

V–

VO

RL

1 kW

–15 V

Insertion Loss = 20 log

VOUT

VIN

FIGURE 8. Insertion Loss

Channel

Select

+15 V

V+

A2

A1

A0

GND EN

S1

S8

D

V–

–15 V

Meter

HP4192A

Impedance

Analyzer

or Equivalent

f = 1 MHz

FIGURE 9. Source Drain Capacitance

APPLICATIONSa

V+

Positive Supply

Voltage

(V)

15

10

12

8b

V–

Negative Supply

Voltage

(V)

–15

–12

–10

–8

VIN

Logic Input Voltage

VINH(min)/VINL(max)

(V)

2.4/0.8

2.4/0.8

2.4/0.6

2.4/0.4

VS or VD

Analog Voltage

Range

(V)

–15 to 15

–12 to 12

–10 to 10

–8 to 8

Notes:

a. Application Hints are for DESIGN AID ONLY, not guaranteed and not subject to production testing.

b. Operation below "8 V is not recommended.

Overvoltage Protection

A very convenient form of overvoltage protection consists of

adding two small signal diodes (1N4148, 1N914 type) in series

with the supply pins (see Figure 11). This arrangement

effectively blocks the flow of reverse currents. It also floats the

supply pin above or below the normal V+ or V– value. In this

case the overvoltage signal actually becomes the power

supply of the IC. From the point of view of the chip, nothing has

changed, as long as the difference between VS and the V– rail

doesn’t exceed +44 V. The addition of these diodes will reduce

the analog signal range to 1 V below V+ and 1 V above V–, but

it preserves the low channel resistance and low leakage

characteristics.

V+ v Vg v V–

SX

Vg

+15 V

1N4148

V+

DG508A_MIL

Internal

Junction

D

Internal

Junction

V–

1N4148

–15 V

FIGURE 10. Overvoltage Protection Using Blocking Diodes

Document Number: 70067

S-00405—Rev. C, 21-Feb-00

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

5-9

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