KAD/ADC/141 ¼-bridge Analog Digital Converter

¼-bridge ADC (current excitation, RTD temp. sensors, 3.125kHz b/w) - 16ch at 12.5ksps

The KAD/ADC/141 provides independent excitation for up to 16 channels and is intended for RTD type sensors. Each channel has a separate programmable digital filter and A/D converter.

At the heart of the KAD/ADC/141 is a hard-wired state-machine that oversamples all channels at a rate between 50ksps and 100ksps and digitally filters any noise above the user-programmable cutoff frequency. This is achieved using cascaded, half-band, finite-impulse-response filters followed by an 8th order Butterworth infinite-impulse-response 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.

The excitation current through the RTD is kept constant. As the resistance changes, the voltage across the RTD (and hence as seen by the amplifier) changes linearly.

A linearization table for each channel can be used to compensate for non-linear sensors or to fine-tune gain and offset.

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Features

  • 16 × ¼-bridge 3-wire input channels for PT50/PT100 RTD sensors
  • Input range -200°C to 750°C
  • High accuracy (0.87°C between -50 and 200°C @ 2mA for PT100; 2.6°C between -200 and 750°C @ 2mA for PT50)
  • Programmable constant current excitation per group of four channels
  • Short on any channel does not affect others
  • 16-bit simultaneous sampling on each channel

Applications

  • Temperature measurements with PT50 or PT100 RTD sensors
KAD/ADC/136 Flexible ADC (full/½-bridge, ICP, PT100, thermocouple, FIR/IIR, 12.5 kHz b/w) - 8 channels at 50 ksps

KAD/ADC/136 Flexible ADC (full/½-bridge, ICP, PT100, thermocouple, FIR/IIR, 12.5 kHz b/w) - 8 channels at 50 ksps

The KAD/ADC/136 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, ICP sensor, RTD...

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