3. External Connection
AD12-16(PCI)E, AD12-16U(PCI)E, AD16-16(PCI)E
47
Analog Input Signal Connection
The procedure for connecting analog signals depends on whether the analog input signals are single-
ended or differential. The sections below describe how to connect the signals using flat cable and
shielded cable.
Single-ended Input
The following figure shows an example of optional flat cable (PCA37P) connection.
Connect separate signal and ground wires for each analog input channel on CN1.
Analog Input 0..15
Analog Ground
BOARD
CN1
Cable
Signal Source
Figure 3.5. Single-ended Input Connection (Flat Cable)
The following example connects a signal source to the board using a shielded cable such as a coaxial
cable (PCC16PS) available as an option. Use shielded cable if the distance between the signal source
and board is long or if you want to provide better protection from noise. For each analog input channel
on CN1, connect the core wire to the signal line and connect the shielding to ground.
Analog Ground
Shield cable
Analog Input 0..15
BOARD
CN1
Signal Source
Figure 3.6. Single-ended Input Connection (Shield Cable)
CAUTION
-
If the signal source contains over 1MHz signals, the signal may effect the cross-talk noise between
channels.
-
If the board and the signal source receive noise or the distance between the board and the signal
source is too long, data may not be input properly.
-
An input analog signal should not exceed the maximum input voltage (relate to the board analog
ground). If it exceeds the maximum voltage, the board may be damaged.
-
Connect all the unused analog input channels to analog ground.
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