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Chapter 3 Theory of Operation
AT-MIO-16X User Manual 3-16
©
National Instruments Corporation
Figure 3-9. Analog Output Circuitry Block Diagram
Analog Output Circuitry
Each analog output channel contains a 16-bit DAC, reference selection
switches, unipolar/bipolar output selection switches, and output data
coding circuitry.
The DAC in each analog output channel generates a voltage
proportional to the input voltage reference (V
ref
) multiplied by the
digital code loaded into the DAC. Each DAC can be loaded with a
16-bit digital code by writing to registers on the AT-MIO-16X board.
I/O Connector
REF Selection
Internal
REF
EXTREF
DAC1
DAC0WR
DATA
/
16
DAC0 OUT
AO GND
DAC1 OUT
DAC0
DAC1WR
PC I/O Channel
+5 V INT REF
x2
x2
REF Selection
REF
REF
Internal
REF
From
Offset
DAC0
From
Offset
DAC1
From Gain DAC1
+5 V INT REF
From Gain DAC0