X9313 Просмотр технического описания (PDF) - Renesas Electronics

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X9313

Digitally Controlled Potentiometer (XDCP™) Linear, 32 Taps, 3 Wire Interface, Terminal Voltages ± VCC

Renesas Electronics 

X9313

Applications Information

Electronic digitally controlled potentiometers (XDCP) provide

three powerful application advantages:

1. The variability and reliability of a solid-state potentiometer.

2. The flexibility of computer-based digital controls.

3. The retentivity of nonvolatile memory used for the storage

of multiple potentiometer settings or data.

Basic Configurations of Electronic Potentiometers

VR

VR

VH

VW/RW

VL

THREE-TERMINAL POTENTIOMETER;

VARIABLE VOLTAGE DIVIDER

Basic Circuits

BUFFERED REFERENCE VOLTAGE

R1

+V

VREF

+5V

VW

+

OP-07

–

VOUT

-5V

VOUT = VW/RW

I

TWO-TERMINAL VARIABLE RESISTOR;

VARIABLE CURRENT

CASCADING TECHNIQUES

+V

+V

VW/RW

+V

(a)

X

VW

(b)

NONINVERTING AMPLIFIER

+5V

VS

+

LM308A

–

VO

-5V

R2

R1

VO = (1 + R2/R1)VS

VOLTAGE REGULATOR

OFFSET VOLTAGE ADJUSTMENT

COMPARATOR WITH HYSTERESIS

VIN

317

VO (REG)

R1

Iadj

R2

VO (REG) = 1.25V (1 + R2/R1) + IADJ R2

R1

VS

100k

10k

R2

–

+

TL072

10k

10k

+12V

-12V

VS

LT311A –

VO

+

VO

R1

R2

VUL = [R1/(R1 + R2)] VO(max)

VLL = [R1/(R1 + R2)] VO(min)

(FOR ADDITIONAL CIRCUITS SEE AN115)

FN8177 Rev 7.00

October 7, 2015

Page 8 of 12

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