CAT523 데이터 시트보기 (PDF) - ON Semiconductor

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CAT523

Dual Digitally Programmable Potentiometer (DPP™) with 256 Taps and Microwire Interface

ON Semiconductor 

Not Recommended for New Design

CAT523

APPLICATION CIRCUITS

CONTROL

& DATA

+5V

VI

RI

RF

VDD

VREFH

CAT523

VDPP

+15V

–

+

OP 07

VOUT

GND

VREFL

-15V

V OUT

=

VDPP

( RI+ RF )

RI

-

VI RF

For R I = RF

VOUT = 2VDPP - VI

DPP INPUT DPP OUTPUT

ANALOG OUTPUT

VDPP

=

CODE

255

x

(VFS -

VZERO)

+

VZERO

MSB LSB VFS = 0.99VREF

VREF = 5V

VZERO = 0.01VREF

RI = RF

1111 1111

1000 0000

0111 1111

0000 0001

0000 0000

255

255

×

0.98VREF

+

0.01VREF

=

0.990VREF

128

255

×

0.98VREF

+

0.01VREF

=

0.502VREF

127

255

×

0.98VREF

+

0.01VREF

=

0.498VREF

1

255

×

0.98VREF

+

0.01VREF

=

0.014VREF

0

255

×

0.98VREF

+

0.01VREF

=

0.010VREF

VOUT = +4.90V

VOUT = +0.02V

VOUT = -0.02V

VOUT = -4.86V

VOUT = -4.90V

Bipolar DPP Output

V+

CONTROL

& DATA

+5V

RI

RF

I > 2mA

VDD

VREFH

CAT523

GND

VREFL

+15V

–

+

OP 07

-15V

VOUT

CONTROL

& DATA

VOUT = (1 + RRFI ) VDPP

VDD

VREFH

CAT523

GND

VREFL

VREF = 5.00V

LT 1029

Amplified DPP Output

Digitally Trimmed Voltage Reference

28 ÷ 32V

15kΩ 10µF

CONTROL

& DATA

1N5231B

10kΩ

VDD

VREFH 5.1V

CAT523

GND

VREFL

+

–

LM 324

4.02kΩ

1.00kΩ

MPT3055EL

10µF

35V

OUTPUT

0 - 25V

@ 1A

Digitally Controlled Voltage Reference

© 2008 SCILLC. All rights reserved.

9

Characteristics subject to change without notice

Doc. No. MD-2005 Rev. I

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