CAT522(2000) 데이터 시트보기 (PDF) - Catalyst Semiconductor => Onsemi

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CAT522
(Rev.:2000)

8-Bit Dual Digital POT With Independent Reference Inputs

Catalyst Semiconductor => Onsemi 

CAT522

APPLICATION CIRCUITS (Cont.)

+5V

VREF

VDD

VREFH

FINE ADJUST

DAC

RC

=

——VR—E—F —

256 * 1 µA

Fine adjust gives ± 1 LSB change in V OFFSET

when VOFFSET =

—VR—E—F

2

127RC

COARSE ADJUST

DAC

+V

RC

V OFFSET +

–

GND

VREFL

Advanced Information

+5V

+VREF

VDD

VREFH

FINE ADJUST

DAC

COARSE ADJUST

DAC

GND

VREFL

-V REF

127RC

RC

RC

=

(—+V—R—EF—) —- (—VO—FF—S—ET—+—)

1 µA

Ro

=

(—-V—RE—F—) +—(—VO—FF—S—ET—+—)

1 µA

+V

Ro

VOFFSET +

–

-V

Coarse-Fine Offset Control by Averaging DAC Outputs

for Single Power Supply Systems

Coarse-Fine Offset Control by Averaging DAC Outputs

for Dual Power Supply Systems

CONTROL

& DATA

V+

I > 2 mA

VDD

VREFH

OCAPT552025

GND

VREFL

VREF= 5.000V

LT 1029

Digitally Trimmed Voltage Reference

28 - 32V

CONTROL

& DATA

15K

10 µF

1N5231B

VDD

VREFH 5.1V

COAPTT550252

+

GND

VREFL

–

1.00K

10K

LM 324

4.02 K

MPT3055EL

10 µF

35V

OUTPUT

0 - 25V

@ 1A

Digitally Controlled Voltage Reference

8/00

8

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