Data Translation DT9800 Series, User Manual

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Chapter 2
42
Conversion Modes
DT9802, DT9802-MAC, DT9802-EC, DT9802-EC-I, DT9804,
DT9804-MAC, DT9804-EC, DT9804-EC-I, and DT9806 modules can
perform single-value analog output operations only. Use software to
specify the range, gain, and analog output channel, then output the
data from the specified channel. You cannot specify a clock source,
trigger source, or buffer.
Note: You cannot perform a single-value analog output operation
while the A/D subsystem is running.
The settling time for each DAC is 50
µ
s (20 V steps).
Single-value operations stop automatically when finished; you
cannot stop a single-value operation.
Data Format
Data from the host computer must use offset binary data encoding for
analog output signals. Using software, specify the data encoding as
binary.
In software, you need to supply a code that corresponds to the analog
output value you want the module to output. To convert a voltage to
a code, use the following formulas:
LSB = FSR
2
N
Code = Vout - offset
LSB