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AD4058BCPZ-R2 数据表(PDF) 19 Page - Analog Devices

部件名 AD4058BCPZ-R2
功能描述  Compact, Low Power, 16-Bit, 2 MSPS/500 kSPS Easy Drive SAR ADC
PDF  66 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD4058BCPZ-R2 数据表(HTML) 19 Page - Analog Devices

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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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