AD5204BRUZ100-R7 datasheet(14/20 Pages) AD

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AD5204/AD5206

Rev. C | Page 14 of 20

PROGRAMMING THE POTENTIOMETER DIVIDER

VOLTAGE OUTPUT OPERATION

The digital potentiometer easily generates an output voltage

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

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

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.

VDD

CLK

SDO*

RDAC

LATCH

4/6

A4/A6

W4/W6

B4/B6

ADDR

DEC

SDI

SER

REG

SHDN*

DGND

*AD5204 ONLY

RDAC

LATCH

AD5204/AD5206

Figure 22. Block Diagram

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