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AD7912 Fiches technique(PDF) 10 Page - Analog Devices |
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AD7912 Fiches technique(HTML) 10 Page - Analog Devices |
10 / 32 page AD7912/AD7922 Rev. 0 | Page 10 of 32 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS VDD GND VIN0 VIN1 8 7 6 5 DOUT 1 CS 2 SCLK 3 DIN 4 AD7912/ AD7922 8-LEAD MSOP TOP VIEW (Not to Scale) Figure 8. 8-Lead MSOP Pin Configuration VIN1 VIN0 GND VDD 8 7 6 5 DIN 1 SCLK 2 CS 3 DOUT 4 AD7912/ AD7922 8-LEAD TSOT TOP VIEW (Not to Scale) Figure 9. 8-Lead TSOT Pin Configuration Table 5. Pin Function Descriptions MSOP Pin No. TSOT Pin No. Mnemonic Function 1 4 DOUT Data Out. Logic output. The conversion result from the AD7912/AD7922 is provided on this output as a serial data stream. The bits are clocked out on the falling edge of the SCLK signal. For the AD7922, the data stream consists of two leading zeros, the channel identifier bit that identifies which channel the conversion result corresponds to, followed by the mode bit that indicates the current mode of operation, followed by the 12 bits of conversion data with MSB first. For the AD7912, the data stream consists of two leading zeros, the channel identifier bit that identifies which channel the conversion result corresponds to, followed by the mode bit that indicates the current mode of operation, followed by the 10 bits of conversion data with MSB first and two trailing zeros. 2 3 CS Chip Select. Active low logic input. This input provides the dual function of initiating conversions on the AD7912/AD7922 and framing the serial data transfer. 3 2 SCLK Serial Clock. Logic input. SCLK provides the serial clock for accessing data from the part. This clock input is also used as the clock source for the AD7912/AD7922’s conversion process. 4 1 DIN Data In. Logic input. The channel to be converted is provided on this input and is clocked into an internal register on the falling edge of SCLK. 6, 5 7, 8 VIN0, VIN1 Analog Inputs. These two single-ended analog input channels are multiplexed into the on-chip track-and-hold amplifier. The analog input channel to be converted is selected by writing to the third MSB on the DIN pin. The input range is 0 to VDD. 7 6 GND Analog Ground. Ground reference point for all circuitry on the AD7912/AD7922. All analog input signals should be referred to this GND voltage. 8 5 VDD Power Supply Input. The VDD range for the AD7912/AD7922 is from 2.35 V to 5.25 V. |
Numéro de pièce similaire - AD7912 |
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Description similaire - AD7912 |
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