AXN/ADC/401 - Flexible ADC Module

The AXN/ADC/401 is used to condition and digitize up to eight analog channels. Each channel can be configured for use in differential ended or single ended voltage measurement, AC coupled single ended voltage, ICP sensor, RTD sensor, thermocouple, full-bridge, half-bridge, or potentiometer mode.

For each thermocouple channel, it is necessary to select the Junction Compensation Channel setting. Internally, the AXN/ADC/401 performs linearization for RTD and thermocouple modes.

At the heart of the AXN/ADC/401 is a hard-wired state-machine that oversamples all channels at a rate between 100ksps and 200ksps and digitally filters any noise above the user-programmable cutoff frequency.

This is achieved using cascaded, half-band FIR filters. If IIR filtering mode is selected, the last digital filter in the filtering chain is an 8th order Butterworth IIR filter. There are two independently configurable output streams per channel, allowing different sample rate, cutoff, and filter type to be selected for each output stream. All signals are sampled simultaneously. When several channels are sampled at different sampling rates, at the start of an acquisition cycle all channels are aligned.

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Features

  • Eight flexible input channels
  • Programmable input range (±40mV to ±10V)
  • High accuracy (0.02% FSR typical)

Applications

  • Flight test instrumentation systems for limited spaces
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