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AD5551BRZ-REEL7 Fiches technique(PDF) 15 Page - Analog Devices

No de pièce AD5551BRZ-REEL7
Description  2.7 V to 5.5 V, Serial-Input, Voltage-Output, 14-Bit DACs
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD5551BRZ-REEL7 Fiches technique(HTML) 15 Page - Analog Devices

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AD5551/AD5552
Rev. A | Page 15 of 16
APPLICATIONS INFORMATION
OPTOCOUPLER INTERFACE
The digital inputs of the AD5551/AD5552 are Schmitt-
triggered, so they can accept slow transitions on the digital
input lines. This makes these parts ideal for industrial applica-
tions where it may be necessary that the DAC is isolated from
the controller via optocouplers. Figure 29 illustrates such an
interface.
10µF
0.1µF
VOUT
VDD
POWER
GND
5V
REGULATOR
AD5551/
AD5552
10kΩ
VDD
CS
CS
DIN
10kΩ
VDD
DIN
10kΩ
VDD
SCLK
SCLK
Figure 29. AD5551/AD5552 in an Optocoupler Interface
DECODING MULTIPLE AD5551/AD5552S
The CS pin of the AD5551/AD5552 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.
shows a typical circuit.
Figure 30
AD5551/
AD5552
CS
DIN
SCLK
VOUT
AD5551/
AD5552
CS
DIN
SCLK
VOUT
AD5551/
AD5552
CS
DIN
SCLK
VOUT
AD5551/
AD5552
CS
DIN
SCLK
VOUT
VDD
DGND
EN
CODED
ADDRESS
SCLK
DIN
ENABLE
DECODER
Figure 30. Addressing Multiple AD5551/AD5552s


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