Chapter 5
56
DT331, DT332, DT333, and DT334 boards can output data from a single analog output channel
only. Use software to specify the channel.
Ranges and Gains
DT331 and DT332 boards support the following ranges for each DAC: ±10 V (the default), 0 to
10 V, ±5 V, or 0 to 5 V. The DT333 and DT334 boards support the ±10 V range only. Specify the
range using software.
The gain for the D/A subsystem on the DT330 Series boards is always 1 (the default value).
Conversion Mode
DT331, DT332, DT333, and DT334 boards can perform single-value operations only. Use
software to specify the value to output from the analog output channel, using the channel and
range that you specified.
Single-value operations stop automatically when finished; you cannot stop a single-value
operation.
Data Format
In software, you need to supply a code that corresponds to the analog output value you want
the board to output. To convert a voltage to a code, use the following formulas:
LSB = FSR
2
N
Code = Vout – Offset
LSB
where,
•
LSB
is the least significant bit.
•
FSR
is the full-scale range. For the DT330 Series, the full-scale analog output range is 5 for
the unipolar range of 0 to 5 V, 10 for the unipolar range of 0 to 10 V or the bipolar output
range of ±5 V, or 20 for the bipolar range or ±10 V.
•
N
is the number of bits of the DAC. For the DT331 and DT332 boards,
N
is 12. For the
DT333 and DT334 boards,
N
is 16.
•
Code
is the raw count used by the software to represent the voltage.
•
Vout
is the analog output voltage.
•
Offset
is the minus full-scale value. The minus full-scale value is 0.0 V for the unipolar
ranges,
−
5 V for the ±5 V range, or
−
10 V for the ±10 V range.
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Содержание DT330 Series
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