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AD7989-1BCPZ-RL7 Datasheet(PDF) 8 Page - Analog Devices |
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AD7989-1BCPZ-RL7 Datasheet(HTML) 8 Page - Analog Devices |
8 / 24 page AD7989-1/AD7989-5 Data Sheet Rev. B | Page 8 of 24 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 4. 10-Lead MSOP Pin Configuration Figure 5. 10-Lead LFCSP Pin Configuration Table 7. Pin Function Descriptions Pin No. Mnemonic Type1 Description 1 REF AI Reference Input Voltage. The REF range is 2.4 V to 5.1 V. This pin is referred to the GND pin and must 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 Conversion Input. This input has multiple functions. On its leading edge, it initiates the conversions and selects the interface mode of the device: chain mode or chip select (CS) mode. In CS mode, the SDO pin is enabled when CNV is low. In chain mode, the data is 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 device is selected, the conversion result is shifted out by this clock. 9 SDI/CS DI Serial Data Input/Chip Select. This input has multiple functions. It selects the interface mode of the ADC as follows: Chain mode is selected if this pin is low during the CNV rising edge. In this mode, SDI/CS is a data input that daisy-chains the conversion results of two or more ADCs onto a single SDO line. The digital data level on SDI/CS is the output on SDO with a delay of 16 SCK cycles. CS mode is selected if SDI/CS is high during the CNV rising edge. In this mode, either SDI/CS or CNV can enable the serial output signals when low. 10 VIO P Input/Output Interface Digital Power. This pin is nominally at the same supply as the host interface (1.8 V, 2.5 V, 3 V, or 5 V). EPAD Exposed Pad. For the LFCSP, the exposed pad can be connected to GND. This connection is not required to meet the electrical performances. 1AI means analog input, DI means digital input, DO means digital output, and P means power. REF 1 VDD 2 IN+ 3 IN– 4 GND 5 VIO 10 SDI/CS 9 SCK 8 SDO 7 CNV 6 AD7989-1/ AD7989-5 TOP VIEW (Not to Scale) NOTES 1. EXPOSED PAD. FOR THE LFCSP, THE EXPOSED PAD CAN BE CONNECTED TO GND. THIS CONNECTION IS NOT REQUIRED TO MEET THE ELECTRICAL PERFORMANCES. 1 REF 2 VDD 3 IN+ 4 IN– 5 GND 10 VIO 9SDI/CS 8SCK 7SDO 6CNV AD7989-1/ AD7989-5 TOP VIEW (Not to Scale) |
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