User`s manual

APPENDIX E – ANALOG I/O MEZZANINE CARD E-3
CDS7324 (FORMERLY LSF-0819)
Rev. A INSTALLATION & USER’S MANUAL
Differential signal
(+)
External Source
DS2110 Analog Input
Input
E.4.3 Differential Inputs
Differential inputs measure the voltage between two distinct input signals. Within a certain
range - called the common mode range - measurement is almost independent of signal
source to board ground variations. A
differential input is also more immune to EMI than a
single-ended input. Most EMI noise induced in one lead is also induced in the other. The
input measures only the difference between the two leads, and the EMI common to both is
ignored. Figure E5 shows the basic differential input
configuration.
Figure E5 Differential Input
The common mode noise and input signal between the External Source and the DS2110
input must not exceed 13.1V / 30mA or the device will not work properly. Excessive
voltage/current input will result in damage to the input operational amplifier circuits.