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AD7453 데이터시트(PDF) 6 Page - Analog Devices |
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AD7453 데이터시트(HTML) 6 Page - Analog Devices |
6 / 20 page REV. 0 –6– AD7453 PIN CONFIGURATION PIN FUNCTION DESCRIPTIONS Mnemonic Function VREF Reference Input for the AD7453. An external reference in the range 100 mV to 3.5 V must be applied to this input. The specified reference input is 2.5 V. This pin should be decoupled to GND with a capacitor of at least 0.1 mF. VIN+ Noninverting Analog Input. VIN– Inverting Input. This pin sets the ground reference point for the VIN+ input. Connect to ground or to a dc offset to provide a pseudo ground. GND Analog Ground. Ground reference point for all circuitry on the AD7453. All analog input signals and any external reference signal should be referred to this GND voltage. CS Chip Select. Active low logic input. This input provides the dual function of initiating a conversion on the AD7453 and framing the serial data transfer. SDATA Serial Data. Logic output. The conversion result from the AD7453 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 of the AD7453 consists of four leading zeros followed by the 12 bits of conversion data that are provided MSB first. The output coding is straight (natural) binary. 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 conversion process. VDD Power Supply Input. VDD is 2.7 V to 5.25 V. This supply should be decoupled to GND with a 0.1 mF capacitor and a 10 mF tantalum capacitor. 8-Lead SOT-23 1 AD7453 TOP VIEW (Not to Scale) VDD VREF 8 2 SCLK VIN+ 7 3 CS VIN– 6 4 SDATA GND 5 |
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