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AD7984 Datasheet(PDF) 7 Page - Analog Devices |
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AD7984 Datasheet(HTML) 7 Page - Analog Devices |
7 / 24 page Data Sheet AD7984 Rev. B | Page 7 of 24 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 4. 10-Lead MSOP Pin Configuration Figure 5. 10-Lead LFCSP Pin Configuration Table 6. Pin Function Descriptions Pin No. Mnemonic Type1 Description 1 REF AI Reference Input Voltage. The REF range is 2.9 V to 5.1 V. This pin is referred to the GND pin and should be decoupled closely to the GND pin with a 10 μF capacitor. 2 VDD P Power Supply. 3 IN+ AI Differential Positive Analog Input. 4 IN− AI Differential Negative Analog Input. 5 GND P Power Supply Ground. 6 CNV DI Convert Input. This input has multiple functions. On its rising edge, it initiates the conversions and selects the interface mode of the part: chain mode or CS mode. In CS mode, the SDO pin is enabled when CNV is low. In chain mode, the data should be read when CNV is high. 7 SDO DO Serial Data Output. The conversion result is output on this pin. It is synchronized to SCK. 8 SCK DI Serial Data Clock Input. When the part is selected, the conversion result is shifted out by this clock. 9 SDI DI Serial Data Input. This input provides multiple features. It selects the interface mode of the ADC as follows: Chain mode is selected if SDI is low during the CNV rising edge. In this mode, SDI is used as a data input to daisy-chain the conversion results of two or more ADCs onto a single SDO line. The digital data level on SDI is output on SDO with a delay of 18 SCK cycles. CS mode is selected if SDI is high during the CNV rising edge. In this mode, either SDI or CNV can enable the serial output signals when low. If SDI or CNV is low when the conversion is complete, the busy indicator feature is enabled. 10 VIO P Input/Output Interface Digital Power. Nominally at the same supply as the host interface (1.8 V, 2.5 V, 3 V, or 5 V). 1 AI = analog input, DI = digital input, DO = digital output, and P = power. REF 1 VDD 2 IN+ 3 IN– 4 GND 5 VIO 10 SDI 9 SCK 8 SDO 7 CNV 6 AD7984 TOP VIEW (Not to Scale) REF VDD IN+ IN– GND VIO SDI SCK SDO CNV 1 2 3 4 10 9 8 7 5 6 *EXPOSED PADDLE CAN BE CONNECTED TO GROUND. AD7984 (EXPOSED PAD)* |
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