MAX5391 データシートの表示（PDF） - Maxim Integrated

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MAX5391

Dual 256-Tap, Volatile, Low-Voltage Linear Taper Digital Potentiometers

Maxim Integrated 

MAX5391/MAX5393

Dual 256-Tap, Volatile, Low-Voltage

Linear Taper Digital Potentiometers

CS

tCSO

SCLK

tCSS

tDH

tDS

tCH

tCL

tCSW

tCS1

tCP

tCSH

DIN

Figure 3. SPI Timing Diagram

REG A: The data byte writes to register A, and the wiper

of potentiometer A moves to the appropriate position at

the rising edge of CS. D[7:0] indicates the position of the

wiper. D[7:0] = 00h moves the wiper to the position clos-

est to LA. D[7:0] = FFh moves the wiper closest to HA.

D[7:0] is 80h following power-on.

REG B: The data byte writes to register B, and the wiper

of potentiometer B moves to the appropriate position at

the rising edge of CS. D[7:0] indicates the position of the

wiper. D[7:0] = 00h moves the wiper to the position clos-

est to LB. D[7:0] = FFh moves the wiper to the position

closest to HB. D[7:0] is 80h following power-on.

REG A and B: The data byte writes to registers A and

B, and the wipers of potentiometers A and B move to the

appropriate position. D[7:0] indicates the position of the

wiper. D[7:0] = 00h moves the wiper to the position clos-

est to L_. D[7:0] = FFh moves the wiper to the position

closest to H_. D[7:0] is 80h following power-on.

Applications Information

Variable Gain Amplifier

Figure 4 shows a potentiometer adjusting the gain of a

noninverting amplifier. Figure 5 shows a potentiometer

adjusting the gain of an inverting amplifier.

Adjustable Dual Regulator

Figure 6 shows an adjustable dual linear regulator using a

dual potentiometer as two variable resistors.

Adjustable Voltage Reference

Figure 7 shows an adjustable voltage reference circuit

using a potentiometer as a voltage divider.

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