3. External Connection
48
AD12-16(PCI)E, AD12-16U(PCI)E, AD16-16(PCI)E
Differential Input
The following figure shows an example of optional flat cable (PCA37P) connection.
For each analog input channel on CN1, connect the "+" input to the signal and connect the "-" input to
the signal source ground. Also connect the analog ground on the board to the signal source ground.
Analog Input 0[+]..7[+]
Analog Ground
BOARD
Cable
Signal Source
Analog Input 0[-]..7[-]
CN1
Figure 3.7. Differential Input Connection (Flat Cable)
The following example connects a signal source to the board using a shielded cable such as a two-
conductor shielded cable (PCD8PS) 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 "+" input to the signal and connect the "-" input to the signal
source ground. Also connect the analog ground on the board and the signal source ground to the
shielding.
Analog Input 0[+]..7[+]
Analog Ground
BOARD
Signal Source
Analog Input 0[-]..7[-]
CN1
Shield cable
Figure 3.8. Differential Input Connection (Shield Cable)
CAUTION
-
If the signal source contains over 1MHz signals, the signal may effect the cross-talk noise between
channels.
-
When the analog ground is not connected, input data comes to be undetermined.
-
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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