Chapter 5
Calibration
5-8
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National Instruments Corporation
Calibration DACs
The calibration DACs are used to adjust the analog signal paths for errors
such as offset and gain. The 12-bit boards use an MB88341 serial DAC for
calibration, which contains twelve 8-bit DACs. Notice that the last
two DACs are used for the analog trigger circuitry on the AT-MIO-16E-1,
AT-MIO-16E-2, and the AT-MIO-64E-3. The AT-MIO-16XE-50 uses
a DAC8800 and DAC8043 serial DAC for calibration. The
AT-MIO-16XE-10 and AT-AI-16XE-10 use a DAC8800 and DAC8043
for calibration and AD8522 for analog triggering. The DAC8800 contains
eight 8-bit DACs, the DAC8043 contains one 12-bit DAC, and the
AD8522 contains two 12-bit DACs.
The Serial Command Register has five bits—SerClk (bit 0), SerData (bit 1),
SerDacLd0 (bit 3), SerDacLd1 (bit 4), and SerDacLd2 (bit 5)—that are
connected to the serial DAC clock, data in, load for the 8-bit DACs, and
load for the 12-bit DAC pins, respectively.
The format for writing to all of the serial DACs is similar to the EEPROM.
The basic write cycle consists of shifting an address/data pair into the DAC,
then pulsing the appropriate SerDacLd pin. The timing diagram for the
write cycle for each DAC is shown in Figure 5-2 (a, b, c, d).
Note
Review the timing diagram and specifications very carefully before attempting to
write code.
Summary of Contents for AT-AI-16XE-10
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