Data Translation DT9820 Series, User Manual

Page: 36 / 112

Chapter 2
24
Output Ranges and Gains
The output range for each DAC is ±5 V. Specify the range using
software; set the gain to 1.
Conversion Modes
DT9822 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.
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
where,
• LSB is the least significant bit.
• FSR is the full-scale range (10).
• N is the output resolution (16 bits).