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AD7738 Datasheet(PDF) 8 Page - Analog Devices |
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AD7738 Datasheet(HTML) 8 Page - Analog Devices |
8 / 28 page REV. 0 –8– AD7738 PIN FUNCTION DESCRIPTION (continued) Pin No. Mnemonic Pin Description 15 ADCIN(–) ADC Negative Input. In normal circuit configuration, this pin should be connected to the MUXOUT– pin. 16 ADCIN(+) ADC Positive Input. In normal circuit configuration, this pin should be connected to the MUXOUT+ pin. 21 REFIN(+) Positive Terminal of the Differential Reference Input. REFIN+ voltage potential can lie any where between AVDD and AGND. In normal circuit configuration, this pin should be connected to a 2.5 V reference voltage. 22 REFIN(–) Negative Terminal of the Differential Reference Input. REFIN– voltage potential can lie any where between AVDD and AGND. In normal circuit configuration, this pin should be connected to a 0 V reference voltage. 23 AGND Ground Reference Point for Analog Circuitry 24 RDY Logic Output. Used as a status output in both conversion mode and calibration mode. In conversion mode, a falling edge on this output indicates that either any channel or all channels have unread data available—according to the RDY function bit in the I/O Port register. In calibration mode, a falling edge on this output indicates that calibration is complete. See more details in Digital Interface Description section later in this data sheet. 25 DOUT Serial Data Output with serial data being read from the output shift register on the part. This output shift register can contain information from any AD7738 register depending on the address bits of the Communications register. 26 DIN Serial Data Input (Schmitt triggered) with serial data being written to the input shift register on the part. Data from this input shift register is transferred to any AD7738 register depending on the address bits of the Communications register. 27 DVDD Digital Supply Voltage, 3 V or 5 V Nominal 28 DGND Ground Reference Point for Digital Circuitry |
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