AD5541BR データシートの表示（PDF） - Analog Devices

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AD5541BR

2.7 V to 5.5 V, Serial-Input, Voltage-Output, 16-Bit DACs

Analog Devices 

Data Sheet

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.

POWER

5V

REGULATOR

10µF

0.1µF

SCLK

VDD

10kΩ

VDD

SCLK

VDD

AD5541/AD5542

10kΩ

CS

CS

VOUT

VDD

10kΩ

DIN

DIN

GND

Figure 29. AD5541/AD5542 in an Optocoupler Interface

AD5541/AD5542

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.

SCLK

DIN

VDD

AD5541/AD5542

CS

DIN

VOUT

SCLK

ENABLE

CODED

ADDRESS

EN

DECODER

DGND

AD5541/AD5542

CS

DIN

VOUT

SCLK

AD5541/AD5542

CS

DIN

SCLK

VOUT

AD5541/AD5542

CS

DIN

VOUT

SCLK

Figure 30. Addressing Multiple AD5541/AD5542s

Rev. F | Page 15 of 20

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