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The KAD/TDC/101 provides independent excitation for up to 16 channels and is intended for 10kΩ thermistor type sensors. Each channel has a separate programmable digital filter and A/D converter.
At the heart of the KAD/TDC/101 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, 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.
A linearization table for each channel can be used to compensate for non-linear sensors or to fine-tune gain and offset.
Features
- 16 ¼-bridge (2-wire) input channels for 10kΩ thermistor type sensors
- 16-bit simultaneous sampling on all channels
- Accuracy ±0.8°C
- 5V excitation from a precision voltage reference
- Programmable filter cutoff for each channel
- Short to ground on any channel does not affect others
- Up to 25ksps per channel
- Up to 6.25kHz bandwidth
- Temperature of PCB available as a parameter
Applications
- Temperature measurements using Negative Temperature Coefficient (NTC) thermistors
KAD/TDC/101