Data Translation DT9820 Series, User Manual

Page: 35 / 112

Principles of Operation
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Analog Output Features
Two analog output (D/A) subsystems are provided on the DT9822
function module. The DT9821 does not support analog outputs. This
section describes the following features of the D/A subsystem:
• Output resolution, described on this page;
• Analog output channels, described on this page;
• Output ranges and gains, described on page 24 ;
• Conversion modes, described on page 24 ; and
• Data format, described on page 24 .
Output Resolution
The output resolution of the DT9822 module is fixed at 16 bits.
Analog Output Channels
The DT9822 module supports two DC-level analog output channels
(DAC0 and DAC1). Each DAC is a separate D/A subsystem. Refer to
the DT9820 Series Getting Started Manual for information on how to
wire analog output signals to the module using the screw terminal
panel. You configure the channel type through software.
Within each DAC, the digital data is double-buffered to prevent
spurious outputs, then output as an analog signal. Both DACs power
up to a value of 0 V ±10 mV. Resetting the module does not clear the
values in the DACs.
The DT9822 module can output data from a single analog output
channel only. Specify the channel for a single-value analog output
operation using software; refer to
“Conversion Modes,” on page 24
for more information on single-value operations.