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EVAL-AD7791EBZ Datasheet(PDF) 9 Page - Analog Devices |
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EVAL-AD7791EBZ Datasheet(HTML) 9 Page - Analog Devices |
9 / 21 page AD7791 Data Sheet Rev. A | Page 8 of 20 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 04227-0-005 AD7791 TOP VIEW (Not to Scale) SCLK 1 CS 2 AIN(+) 3 AIN(–) 4 REF(+) 5 DIN DOUT/RDY VDD GND REF(–) 10 9 8 7 6 Figure 5. Pin Configuration Table 4. Pin Function Descriptions Pin No. Mnemonic Function 1 SCLK Serial Clock Input for Data Transfers to and from the ADC. The SCLK has a Schmitt- triggered input, making the interface suita- ble for opto-isolated applications. The serial clock can be continuous with all data transmitted in a continuous train of pulses. Alternatively, it can be a noncontinuous clock with the information being trans- mitted to or from the ADC in smaller batches of data. 2 CS Chip Select Input. This is an active low logic input used to select the ADC. CS can be used to select the ADC in systems with more than one device on the serial bus or as a frame synchronization signal in communi- cating with the device. CS can be hardwired low, allowing the ADC to operate in 3-wire mode with SCLK, DIN, and DOUT used to interface with the device. 3 AIN(+) Analog Input. AIN(+) is the positive terminal of the fully differential analog input. 4 AIN(–) Analog Input. AIN(–) is the negative termi- nal of the fully differential analog input. 5 REFIN(+) Positive Reference Input. REFIN(+) can lie anywhere between VDD and GND + 0.1 V. The nominal reference voltage (REFIN(+) – REFIN(–)) is 2.5 V, but the part functions with a reference from 0.1 V to VDD. Pin No. Mnemonic Function 6 REFIN(–) Negative Reference Input. This reference input can lie anywhere between GND and VDD – 0.1 V. 7 GND Ground Reference Point. 8 VDD Supply Voltage, 2.5 V to 5.25 V. 9 DOUT/RDY Serial Data Output/Data Ready Output. DOUT/RDY serves a dual purpose . It functions as a serial data output pin to access the output shift register of the ADC. The output shift reg- ister can contain data from any of the on-chip data or control registers. In addition, DOUT/RDY operates as a data ready pin, going low to indicate the completion of a conversion. If the data is not read after the conversion, the pin will go high before the next update occurs. The DOUT/RDY falling edge can be used as an interrupt to a processor, indicating that valid data is available. With an external serial clock, the data can be read using the DOUT/RDY pin. With CS low, the data/control word informa- tion is placed on the DOUT/RDY pin on the SCLK falling edge and is valid on the SCLK rising edge. The end of a conversion is also indicated by the RDY bit in the status register. When CS is high, the DOUT/RDY pin is three-stated but the RDY bit remains active. 10 DIN Serial Data Input to the Input Shift Register on the ADC. Data in this shift register is trans- ferred to the control registers within the ADC, the register selection bits of the communications register identifying the appropriate register. |
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