Chapter 3
Hardware Overview
PCI-MIO E Series User Manual
3-12
©
National Instruments Corporation
Selecting a bipolar range for a particular DAC means that any data
written to that DAC will be interpreted as two’s complement format. In
two’s complement mode, data values written to the analog output
channel can be either positive or negative. If you select unipolar range,
data is interpreted in straight binary format. In straight binary mode,
data values written to the analog output channel range must be positive.
♦
PCI-MIO-16XE-10
You can configure each analog output channel for either unipolar or
bipolar output. A unipolar configuration has a range of 0 to 10 V at the
analog output. A bipolar configuration has a range of -10 to +10 V at
the analog output. You do not need to configure both channels for the
same range.
Selecting a bipolar range for a particular DAC means that any data
written to that DAC will be interpreted as two’s complement format. In
two’s complement mode, data values written to the analog output
channel can be either positive or negative. If you select unipolar range,
data is interpreted in straight binary format. In straight binary mode,
data values written to the analog output channel range must be positive.
Analog Output Reglitch Selection
♦
PCI-MIO-16E-1
In normal operation, a DAC output will glitch whenever it is updated
with a new value. The glitch energy differs from code to code and
appears as distortion in the frequency spectrum. Each analog output of
the PCI-MIO-16E-1 contains a reglitch circuit that generates uniform
glitch energy at every code rather than large glitches at the major code
transitions. This uniform glitch energy appears as a multiple of the
update rate in the frequency spectrum. Notice that this reglitch circuit
does not eliminate the glitches; it only makes them more uniform in
size. Reglitching is normally disabled at startup and your software can
independently enable each channel.
