Operation Theory
43
5.6 AD Data Format
The A/D data of 12-bit PCI-9812 is on the 12 MSB of the 16-bit A/
D data. The 4 LSB of the 16-bit A/D data must be truncated by
software (please refer to section 6.2). The relationship between
the real signal voltage and the sampled value is shown in the
following table:
The A/D data of 10-bit PCI-9810 is on the 10 MSB of the A/D data.
The 6 LSB of the 16-bit A/D data must be truncated by software.
The relationship between the real signal voltage and the sampled
value is shown in the following table:
A/D Data
(Hex)
Decimal
Value
V (Volts, -1V to 1V)
V (Volts, -5V to 5V)
7FF 0
+32752
+1.0000
+5.0000
400 0
+16384
+0.5002
+2.5010
001 0
+16
+0.0005
+0.0025
000 0
0
0.0000
0.0000
FFF 0
-16
0.0005
-0.0025
C00 0
-16384
-0.5002
-2.5010
801 0
-32752
-1.0000
-5.0000
800 0
-32768
-1.0049
-5.0024
A/D Data
(Hex)
Decimal
Value
V (Volts, -1V~1V)
V (Volts, -5V~5V)
7FC 0
+32704
+1.0000
+5.0000
400 0
+16384
+0.5002
+2.5010
0040
+64
+0.0005
+0.0025
000 0
0
0.0000
0.0000
FFC 0
-64
-0.0005
-0.0025
C00 0
-16384
-0.5002
-2.5010
804 0
-32704
-1.0000
-5.0000
800 0
-32768
-1.0020
-5.0098
Summary of Contents for NuDAQ PCI-9810
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