Data Translation DT9837, Руководство пользователя

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Chapter 5
76
Analog Output Features
This section describes the following features of analog output operations:
• Analog output channels, described below
• Output ranges and gains, described below
• Output resolution, described on page 76
• Output conversion mode, described on page 77
• Output clocks, described on page 76
• Output triggers, described on page 80
• Data format and transfer, described on page 80
• Error conditions, described on page 81
Analog Output Channels
The DT9837, DT9837A, and DT9837C modules support one analog output channel through
analog output subsystem 0. Note that on the DT9837A module, you can read back the value of
the analog output channel through the analog input channel list; refer to
page 79 for more
information.
The DT9837 and DT9837A modules provide a two-pole, 10 kHz Butterworth filter and the
DT9837C provides a 40 kHz smoothing filter to prevent noise from interfering with the output
signal.
The analog output channel powers up to a value of 0 V ±10 mV.
Output Ranges and Gains
The DT9837 and DT9837A modules can output bipolar analog output signals in the range of
±10 V, with a gain of 1.
The DT9837C module can output bipolar analog output signals in the range of ±3 V, with a
gain of 1.
Output Resolution
The resolution of the analog output channel is fixed at 24-bits; you cannot specify the
resolution in software.
Output Clocks
The output clock on the DT9837, DT9837A, and DT9837C modules is derived from the USB
clock to produce the output clock frequency.