Analog Output - Measurement Computing USB-231 User Manual

USB-231 User's Guide

Analog output

Figure 8 shows the USB-231 analog output circuitry.
The main analog output circuitry blocks are as follows:
The protection circuit prevents damage of the buffers in case of a short circuit or an
 Protection –
overvoltage condition.
The buffer amplifies the analog signal to the ±10 V range and ensures the driving capability for
 Buffer –
the external load.
 DAC 0 and DAC 1 –
analog signals.
The AO FIFO (first-in-first out) ensures that data is transferred to the DACs in a timely manner
 AO FIFO –
without being affected by USB latencies.
The DAC control sets the DAC data rate and the startup condition, which could be
 DAC Control –
triggered by the
TRIG
Analog output signals are referenced to AGND. Connect the loads between AOUT0 or AOUT1 and AGND as
shown in Figure 9.
Figure 8. USB-231 analog output circuitry
The digital-to-analog converters (DAC) convert the digital signals into low-level
signal.
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Functional Details