13

PS8591D

11/17/04

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PS4530/PS4531/PS4532

Precision 8-Ch, 2-Ch, Latched Analog Multiplexers/Switches

Figure 4. Charge Injection

V+

LE

V+

COM

GND

V–

V–

NO_

ADDC

ADDB

ADDA

Channel

Select

EN1

EN2

50

Ohm

V+

VOUT

VEN1

V+

0V

∆V

OUT

∆V

error Q when the channel turns off.

Q =

∆V

V– = 0V for single-supply operation.

Repeat test for each section.

Figure 5. Off Isolation, On Loss, and Crosstalk

V+

LE

V+

COM_

NETWORK

ANALYZER

GND

V–

V–

NO_

ADDC

ADDB

ADDA

Channel

Select

EN2

EN1

V+

50

Ohm

50

Ohm

Measurements are standardized against short at socket terminals.

Off isolation is measured between COM_ and OFF NO_ terminal on each switch.

On loss is measured between COM_ and ON terminal on each switch.

Crosstalk (PS4531/PS4532) is measured from one channel (A,B,C) to all other channels.

Signal direction through switch is reversed; worst values are recorded.

50

Ohm

MEASUREMENT

OFF ISOLATION = 20log

ON LOSS = 20log

CROSSTALK = 20log

REF

50

Ohm

Figure 6. NO/COM Capacitance

V+

LE

V+

COM

GND

V–

V–

NO_

NO_

ADDC

ADDB

ADDA

Channel

Select

1MHz

CAPACITANCE

ANALYZER

EN2

EN1

V+