User`s guide

32  Operation Theorem
single-ended connection. Note that when more than two floating sources are
connected, the sources must be with common ground.
A
IN
A
GND
n = 0, ..., 15
Floating
Signal
Source
O
p
ertiona
A
mplifie
To A/D
In
p
ut
...
V1
V2
Figure 4.1.1 Floating source and single-ended
Differential input mode
The differential input mode provides two inputs that respond to the difference
signal between them. If the signal source has one side connected to local
ground, the differential mode can be used for reducing ground loop. Figure
4.1.2 shows the connection of the differential input mode. However, even if
the signal source is local grounded, the single-ended still can be used when
the Vcm ( Common Mode Voltage) is very small and the effect of ground loop
can be negated.
A
IHn
A
ILn
n = 0, ..., 8
Groun
Signal
Sourc
To A/D
VG1 VG2
Vcm = VG1 - VG2
GN
+
-
Figure 4.1.2 Ground source and differential input