ADLINK PCI-9810 - Manual (Page 54)

42 Operation Theory
5.6 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 (Refer to section 6.2). The relationship between the real
signal voltage and the sampled value is shown below:
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 below:
A/D Data
(Hex)
Decimal
Value
V
(-1 V to +1 V)
V
(-5 V to +5 V)
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
(-1 V to +1 V)
V
(-5 V to +5 V)
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