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AD4052BCPZ-R2 数据表(PDF) 19 Page - Analog Devices |
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AD4052BCPZ-R2 数据表(HTML) 19 Page - Analog Devices |
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19 / 66 page ![]() Data Sheet AD4052/AD4058 THEORY OF OPERATION analog.com Rev. B | 19 of 66 The AD4052/AD4058 serial interface outputs the ADC data into multiples of bytes to maximize compatibility with microcontroller direct memory access (DMA) controllers. The ADC Mode Output Data Format section describes the serial interface data packet format for each of the AD4052/AD4058 operating modes. As described in the Wide Input Common-Mode Range section, the AD4052/AD4058 support arbitrary input common-mode voltag- es, therefore the devices inherently support both differential and single-ended type signals. The AD4052/AD4058 support both twos complement (signed) and straight binary (unsigned) formats to map either differential signals or single-ended signals to the full 16-bit ADC transfer function. The DATA_FORMAT bit in the ADC_MODES register selects between the differential mode and single-ended mode transfer functions as seen in Table 11 and Table 12. Figure 37. ADC Ideal Transfer Function Table 11. ADC Input Voltage to Output Code Mapping (Sample Mode) Description Differential Mode Single-Ended Mode VIN Digital Output Code VIN Digital Output Code FSR − 1 LSB (32767/32768) × VREF 0x7FFF (65535/65536) × VREF 0xFFFF ... ... ... ... ... Midscale + 1 LSB (1/32768) × VREF 0x0001 (32769/65536) × VREF 0x8001 Midscale 0 V 0x0000 (½) × VREF 0x8000 Midscale − 1 LSB −(1/32768) × VREF 0xFFFF (32767/65536) × VREF 0x7FFF ... … ... ... ... −FSR + 1 LSB (−32767/32768) × VREF 0x8001 (1/65536) × VREF 0x0001 −FSR −VREF 0x8000 0 V 0x0000 Table 12. ADC Input Voltage to Output Code Mapping (Averaging and Burst Averaging Modes) Description Differential Mode Single-Ended Mode VIN Digital Output Code VIN Digital Output Code FSR − 1 LSB (524287/524288) × VREF 0x7FFFF (1048575/1048576) × VREF 0xFFFFF ... ... ... ... Midscale + 1 LSB (1/524288) × VREF 0x00001 (524289/1048576) (8193/16384) × VREF 0x80001 Midscale 0 V 0x00000 (½) × VREF 0x80000 Midscale − 1 LSB (−1/524288) (−1/8192) × VREF 0xFFFFF (524287/1048576) × VREF 0x7FFFF ... … ... ... ... −FSR + 1 LSB (−524287/524288) × VREF 0x80001 (1/1048576) × VREF 0x00001 −FSR −VREF 0x80000 0 V 0x00000 |
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