ADLINK PCIe-9852 - Manual (Page 24)

14 Operations
3.2.2 Input Range and Data Format
Data format of the PCIe-9852 is 2’s complement. The ADC data of
PCIe-9852 is on the 14 MSB of the 16-bit A/D data. The 2 LSB of
the 16-bit A/D data should be truncated by software. A/D data
structure is as follows.
Table 3-1: Input Range and Data Format
Table 3-2: Input Range FSR and –FSR Values
Table 3-3: Input Range Midscale Values
3.2.3 DMA Data Transfer
The PCIe-9852, a PCIe Gen 2 X 4 device, is equipped with a
200MS/s high sampling rate ADC, generating a 800 MByte/
second rate.
D15 D14 D13 D12 …. D3 D2 D1 D0
D15 ~ D2 bits represent the data from ADC (2’s complement)
D1, D0 bits are always 0.
Description
Full scale
range
Least
significant bit
FSR-1LSB -FSR
Bipolar Analog
Input ±10V 1.22mV 9.99878V -10.000V
±2V 0.244mV 1.99976V -2V
±0.2V 24.4uV 0.199976V -0.2V
Digital Code N/A N/A 7FFC 8000
Description Midscale +1LSB Midscale Midscale -1LSB
Bipolar Analog
Input ±10V 1.22mV 0V -1.22mV
±2V 0.244mV 0V -0.244mV
±0.2V 24.4V 0V -24.4μV
Digital Code 0001 0000 FFFC