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AD5551BRZ-REEL7 Fiches technique(PDF) 15 Page - Analog Devices |
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AD5551BRZ-REEL7 Fiches technique(HTML) 15 Page - Analog Devices |
15 / 16 page 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 |
Numéro de pièce similaire - AD5551BRZ-REEL7 |
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