User`s guide

Signal Connections • 23
resistor at each channel to provide a bias return path. The resistor value
should be about 100 times the equivalent source impedance. If the source
impedance is less than 100ohms, you can simply connect the negative
side of the signal to AIGND as well as the negative input of the Instru-
mentation Amplifier without any resistors. In differential input mode, less
noise couples into the signal connections than in single-ended mode.
AIxH
AIxL
x = 0, ..., 31
Ground
Referenced
Signal
Source
To A/D
Converter
AIGND
+
-
Instrumentation
Amplifier
+
-
Input Multipexer
Figure 8: Floating source and differential input