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AD7274BUJ-REEL Scheda tecnica(PDF) 9 Page - Analog Devices |
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AD7274BUJ-REEL Scheda tecnica(HTML) 9 Page - Analog Devices |
9 / 20 page –9– REV. PrB PRELIMINARYTECHNICALDATA Preliminary Technical Data AD7273/AD7274 PIN FUNCTION DESCRIPTION Pin Mnemonic Function CS Chip Select. Active low logic input. This input provides the dual function of initiating conversion on the AD7273/AD7274 and also frames the serial data transfer. V DD Power Supply Input. The VDD range for the AD7273/AD7274 is from +2.35V to +3.6V. G N D Analog Ground. Ground reference point for all circuitry on the AD7273/AD7274. All analog input signals should be referred to this GND voltage. VIN Analog Input. Single-ended analog input channel. The input range is 0 to VREF. VREF Voltage Reference Input. This pin becomes the reference voltage input and an external reference should be applied at this pin. The external reference input range is 1.2V to VDD. A TBD µF capacitor should be tied between this pin and AGND. SDATA Data Out. Logic output. The conversion result from the AD7273/AD7274 is provided on this output as a serial data stream. The bits are clocked out on the falling edge of the SCLK input. The data stream from the AD7274 consists of two leading zeros followed by the 12 bits of conversion data followed by two trailing zeros, which is provided MSB first. The data stream from the AD7273 consists of two leading zeros followed by the 10 bits of conversion data followed by four trailing zeros, which is provided MSB first. SCLK Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock input is also used as the clock source for the AD7273/AD7274's conversion process. |
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