AD5204BN1001 Просмотр технического описания (PDF) - Analog Devices

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AD5204BN1001

4-/6-Channel Digital Potentiometers

Analog Devices 

AD5204/AD5206

PROGRAMMING THE POTENTIOMETER DIVIDER

VOLTAGE OUTPUT OPERATION

CS

The digital potentiometer easily generates an output voltage

CLK

proportional to the input voltage applied to a given terminal.

For example, connecting Terminal A to 5 V and Terminal B to

ground produces an output voltage at the wiper that can be any

SDO*

value from 0 V up to 1 LSB less than +5 V. Each LSB of voltage

is equal to the voltage applied across Terminal A and Terminal B

divided by the 256-position resolution of the potentiometer

divider. The general equation defining the output voltage with

respect to ground for any given input voltage applied to

Terminal A and Terminal B is

SDI

VW (Dx) = Dx/256 × VAB + VB

(3)

Operation of the digital potentiometer in the divider mode

results in more accurate operation over temperature. In this

mode, the output voltage is dependent on the ratio of the

internal resistors, not the absolute value; therefore, the drift

improves to 15 ppm/°C.

SHDN*

EN

A2

DO

A1

A0

D7

ADDR

DEC

SER

REG

DI D0

8

VDD

D7

A1

RDAC

W1

LATCH

1

B1

D0

R

AD5204/AD5206

D7

RDAC

LATCH

4/6

D0

R

A4/A6

W4/W6

B4/B6

DGND

PR

*AD5204 ONLY

Figure 22. Block Diagram

Rev. C | Page 14 of 20

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