X9015 Ver la hoja de datos (PDF) - Renesas Electronics

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Fabricante

X9015

Low Noise, Low Power, Volatile Single Digitally Controlled (XDCP™) Potentiometer

Renesas Electronics 

X9015

Applications Information

Electronic digitally controlled potentiometers provide two powerful application advantages: (1) the variability and reliability of a

solid-state potentiometer, and (2) the flexibility of computer-based digital controls.

Basic Configurations of Electronic Potentiometers

VR

VR

VH/RH

VW/RW

VL/RL

THREE-TERMINAL POTENTIOMETER;

VARIABLE VOLTAGE DIVIDER

I

TWO-TERMINAL VARIABLE RESISTOR;

VARIABLE CURRENT

Basic Circuits

Buffered Reference Voltage

R1

+V

+5V

VREF

VW/RW +

–

OP-07

VOUT

–5V

VOUT = VW

Cascading Techniques

+V

+V

X

VW/RW

+V

VW/RW

(a)

(b)

Noninverting Amplifier

+5V

VS

+

LM308A

–

VO

–5V

R2

R1

VO = (1+R2/R1)VS

VOLTAGE REGULATOR

OFFSET VOLTAGE ADJUSTMENT

VIN

317

R1

Iadj

R2

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

VO (REG)

R1

VS

100k

10k

R2

–

+

TL072

10k

10k

+12V

-12V

COMPARATOR WITH HYSTERESIS

VS

LT311A –

+

VO

VO

R1

R2

VUL = {R1/(R1+R2)} VO(max)

VLL = {R1/(R1+R2)} VO(min)

(FOR ADDITIONAL CIRCUITS, SEE AN115.)

FN8157 Rev 6.00

August 14, 2015

Page 9 of 12

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