National Instruments AT-MIO-64F-5, User Manual

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Configuration and Installation Chapter 2
AT-MIO-64F-5 User Manual 2-28 © National Instruments Corporation
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V
ref
Channel 0
Channel 1
External
Reference
Signal
(Optional)
Load
Load
VOUT 0
VOUT 1
22
20
23
21
DAC1 OUT
AO GND
DAC0 OUT
EXTREF
Analog Output Channels
AT-MIO-64F-5 Board
MIO Subconnector
Figure 2-11. Analog Output Connections
The external reference signal can be either a DC or an AC signal. This reference signal is
multiplied by the DAC code to generate the output voltage.
Digital I/O Signal Connections
Pins 24 through 32 of the MIO subconnector are digital I/O signal pins.
Pins 25, 27, 29, and 31 are connected to the digital lines ADIO<0..3> for digital I/O port A. Pins
26, 28, 30, and 32 are connected to the digital lines BDIO<0..3> for digital I/O port B. Pin 24,
DIG GND, is the digital ground pin for both digital I/O ports. Ports A and B can be programmed
individually to be inputs or outputs.
The following specifications and ratings apply to the digital I/O lines.
Absolute maximum voltage input rating 5.5 V with respect to DIG GND
Digital input specifications (referenced to DIG GND):
V
IH
input logic high voltage 2 V minimum
V
IL
input logic low voltage 0.8 V maximum
I
IH
input current load,
logic high input voltage 40 µA maximum
I
IL
input current load,
logic low input voltage -120 µA maximum