3. External Connection
AD16-64(LPCI)LA
37
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 flat cable connection.
Connect separate signal and ground wires for each analog input channel on CNA/B.
Figure 3.5. Single-ended Input Connection (Flat Cable)
The following figure shows an example of shield cable connection. 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 CNA/B, connect the core wire to the signal line and connect the shielding
to ground.
Figure 3.6. Single-ended Input Connection (Shield Cable)
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If the signal source contains over 1MHz signals, the signal may effect the cross-talk noise between
channels.
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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.
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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.
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Connect all the unused analog input channels to analog ground.
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The signal connected to an input pin may fluctuate after switching of the multiplexer. If this
occurs, shorten the cable between the signal source and the analog input pin or insert a high-speed
amplifier as a buffer between the two to reduce the fluctuation.
-
An input pin may fail to obtain input data normally when the signal source connected to the pin has
high impedance. If this is the case, change the signal source to one with lower output impedance
or insert a high-speed amplifier buffer between the signal source and the analog input pin to reduce
the effect.
Analog Input 0..63
Analog Ground
BOARD
CNA/B
Cable
Signal Source
Analog Ground
Shield cable
Analog Input 0..63
BOARD
CNA/B
Signal Source
CAUTION
Содержание AD16-64(LPCI)LA
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