Operation Theory
29
PCI-69222/PCI-69223 AI Circuitry
Figure 4-2: PCI-69222/PCI-69223 AI Circuitry
AI Data Format
The data format of the acquired 16-bit A/D data is 2’s complement
coding. Table 4-1 shows the valid input ranges and the ideal transfer
characteristics.
Description
Bipolar Analog Input Range
Digital
code
Full-scale Range
±10V
±5V
±2.5V
±2V
Least significant bit
305.2uV
152.6uV
76.3uV
61.03uV
FSR-1LSB
9.999695V 4.999847V 2.499924V 1.999938V
7FFF
Mi1LSB
305.2uV
152.6uV
76.3uV
61.03uV
0001
Midscale
0V
0V
0V
0V
0000
Midscale -1LSB
-305.2uV
-152.6uV
-76.3uV
-61.03uV
FFFF
-FSR
-10V
-5V
-2.5V
-2V
8000
Table 4-1: Bipolar Analog Input Range and Output Digital Code
Description
Bipolar Analog Input Range
Digital
code
Full-scale Range
±1.25V
±1V
±0.5V
±0.25V
Least significant bit
38.14uV
30.51uV
15.25uV
7.62uV
Table 4-2: Bipolar Analog Input Range and Output Digital Code
Summary of Contents for NuDAQ PCI-69222
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