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AD7685BRM 데이터시트(PDF) 8 Page - Analog Devices |
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AD7685BRM 데이터시트(HTML) 8 Page - Analog Devices |
8 / 28 page AD7685 Rev. B | Page 8 of 28 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS REF 1 VDD 2 IN+ 3 IN– 4 GND 5 VIO 10 SDI 9 SCK 8 SDO 7 CNV 6 AD7685 TOP VIEW (Not to Scale) Figure 5. 10-Lead MSOP Pin Configuration 1 REF 2 VDD 3 IN+ 4 IN– 5 GND 10 VIO 9SDI 8SCK 7SDO 6 CNV TOP VIEW (Not to Scale) AD7685 Figure 6. 10-Lead QFN (LFCSP) Pin Configuration Table 7. Pin Function Descriptions Pin No Mnemonic Type1 Description 1 REF AI Reference Input Voltage. The REF range is from 0.5 V to VDD. It is referred to the GND pin. This pin should be decoupled closely to the pin with a 10 μF capacitor. 2 VDD P Power Supply. 3 IN+ AI Analog Input. It is referred to IN−. The voltage range, that is, the difference between IN+ and IN−, is 0 V to VREF. 4 IN− AI Analog Input Ground Sense. Connect to the analog ground plane or to a remote sense ground. 5 GND P Power Supply Ground. 6 CNV DI Convert Input. This input has multiple functions. On its leading edge, it initiates the conversions and selects the interface mode of the part, chain, or CS mode. In CS mode, it enables the SDO pin when 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 16 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, and 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). 1AI = analog input, DI = digital input, DO = digital output, and P = power. |
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