Chapter 2 Configuration and Installa tion
©
National Instruments Corporation 2-23 AT-MIO-16X User Manual
Differential Connections for Ground-Referenced Signal Sources

Figure 2-7 shows how to connect a ground-referenced signal s ource

to an AT-MIO-16X board configured in the DIFF input mode. The

AT-MIO-16X analog input circuitry must be configured for DIFF input

to make these types of connections. Configuration instructions are

included in Chapter 4, Register Map and Descriptions.

Figure 2-7. Differential Input Connections for Grou nd-Referenced Signals

With this type of connection, the PGIA rejects both the common-mode

noise in the signal and the ground potential difference between the

signal source and the AT-MIO-16X ground, shown as Vcm in

Figure 2-7.

Ground-
R
eferenced
Signal
Source
Common-
Mode
Noise,
Ground
Potential,
and so on
Input Multiplexers
AI SENSE
PGIA
VmMeasured
Voltage
AI GND
-
+
-
+
V
s
V
cm
+
-
-
+
I/O Connector
AT-MIO-16X Board in the DIFF Input Configuration
ACH<0..7>
ACH<8..15>
Gain