High-speed Multifunction Boards
User Manual, Ver. 1.0, May 2021, PMH-033-10 Page 12
2.4
Analog Input
2.4.1
Analog Input Range
Input Range refers to the set of input voltages that an Analog Input channel can digitize with the
specified accuracy. The PGA amplifies or attenuates the AI signal depending on the input range.
User can individually program the input range of all channels on PCI-A64SU board.
Input rage affects the resolution of the PCI-A64SU for an AI channel Resolution refer to the voltage
of one ADC code. 24-bit ADC converts Analog Inputs into one of 16777216 codes – that is, one of
16777216 possible digital values. These values are spread fairly evenly across the input range.
Theory
Input Range
Nominal Resolution
(Max – Min)/65536
-10 V to 10 V
0.305 mV
-5 V to 5 V
0.1525 mV
-2.5 V to 2.5 V
0.0762 mV