Analog Output Features; Analog Output Channels; Output Ranges And Gains - Data Translation DT9850 Series User Manual

Analog Output Features

This section describes the following features of analog output operations:
• Analog output channels, described below
• Ranges and gains, described below
• Resolution, described on
• Operation mode, described on
• Data format, described on

Analog Output Channels

The DT9850 Series module supports either 4 or 8 analog output channels, depending on the
module you purchased, through the analog output subsystem. The DT9853 and DT9853-M
modules supports four analog output channels (numbered 0 to 3); the DT9854 and DT9854-M
modules supports eight analog output channels (numbered 0 to 7). The DT9853 and DT9854
modules support voltage output only. The DT9853-M and DT9854-M modules support both
voltage and current output. Use software to specify the channels to update.
Note: On the DT9853-M and DT9854-M modules, the D/A converter controls both a voltage
and current output for each channel. Therefore, when you write to a value to a channel, both
the current output signal and the voltage output signal of the associated channel are affected.
How you wire the analog output channels determines how they are used. Refer to
information on how to wire analog output signals to the module.
Within each analog output channel, the digital data is double-buffered to prevent spurious
outputs, then output as an analog signal. All analog output channels power up to a value of
0 V ±10 mV. Resetting the module does not clear the values in the analog output channels.

Output Ranges and Gains

All DT9850 Series modules support an output range of ±10 V (default) or 0 to 10 V. Specify the
range for the entire subsystem using software; you cannot specify unique ranges for
individual channels. The gain for the D/A subsystem on the DT9850 Series modules is always
1 (the default value).
The voltage output value depends on the code that you write and the output range you
selected. For example, if you specify a range of ±10 V, writing a code of 0000 to the output
corresponds to –10 V; writing a code of FFFF to the output corresponds to +10 V. If, on the
other hand, you specify a range of 0 to 10 V, writing a code of 0000 to the output corresponds
to 0 V; writing a code of FFFF to the output corresponds to +10 V.
If you are using a DT9853-M or DT9854-M module and want to output current, ensure that
you set the voltage range to 0 to 10 V.
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Principles of Operation
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