AD5541LRZ datasheet(15/20 Pages) AD

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Data Sheet

AD5541/AD5542

Rev. F | Page 15 of 20

APPLICATIONS INFORMATION

OPTOCOUPLER INTERFACE

The digital inputs of the AD5541/AD5542 are Schmitt-triggered so

that they can accept slow transitions on the digital input lines.

This makes these parts ideal for industrial applications where it

may be necessary to isolate the DAC from the controller via

optocouplers. Figure 29 illustrates such an interface.

10kΩ

10µF

0.1µF

VDD

VOUT

VDD

SCLK

POWER

10kΩ

VDD

DIN

GND

SCLK

10kΩ

VDD

DIN

REGULATOR

AD5541/AD5542

Figure 29. AD5541/AD5542 in an Optocoupler Interface

DECODING MULTIPLE AD5541/AD5542s

The CS pin of the AD5541/AD5542 can be used to select one of

a number of DACs. All devices receive the same serial clock and

serial data, but only one device receives the CS signal at any one

time. The DAC addressed is determined by the decoder. There is

some digital feedthrough from the digital input lines. Using a

burst clock minimizes the effects of digital feedthrough on the

analog signal channels. Figure 30 shows a typical circuit.

AD5541/AD5542

DIN

SCLK

VOUT

AD5541/AD5542

DIN

SCLK

VOUT

AD5541/AD5542

DIN

SCLK

VOUT

AD5541/AD5542

DIN

SCLK

VOUT

VDD

DGND

CODED

ADDRESS

SCLK

DIN

ENABLE

DECODER

Figure 30. Addressing Multiple AD5541/AD5542s

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