KAD/CDC/103 Differential Ended Current-to-Digital Converter

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Key Features

  • 24 current input channels
  • Input range ±22.2 mA
  • Accuracy (0.042% FSR typical for input range of ±22.2 mA)
  • 16-bit simultaneous sampling on each channel
  • Voltage excitation (open-circuit voltage of 12V) for powering the sensor

Applications

  • For use with 4 - 20 mA transmitters
  • Current measurement
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The KAD/CDC/103 is used to condition and digitize up to 24 differential ended current channels.

At the heart of the KAD/CDC/103 is a hard-wired state-machine that over-samples all channels at a rate between 48 ksps and 96 ksps and digitally filters any noise above the user-programmable cutoff frequency.

This is achieved using cascaded, half-band, finite-impulse-response (FIR) filters followed by an 8th order Butterworth IIR filter with a default cutoff point set at one quarter of the sampling frequency (fc = fs / 4). All signals are sampled simultaneously. Thus, when several channels are sampled at different sampling rates, at the start of an acquisition cycle all channels are aligned.

Voltage excitation is also applied to the sensor.

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