KAD/ADC/113 ¼-bridge ADC (current excitation, PT100 temp. sensors, extended temp., 3 kHz b/w) - 16 channels at 12 ksps
The KAD/ADC/113/ET provides independent excitation for up to 16 channels and is intended for PT100 RTD type sensors. Each channel has a separate programmable digital filter and A/D converter. At the heart of the KAD/ADC/113/ET is a hard-wired state-machine that oversamples 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 Infinite-Impulse-Response (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.
The current through the RTD is programmable from 1 mA to 2 mA in steps of 0.5 µA. 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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- 16 ¼-bridge (3-wire) input channels for PT100 Resistance Temperature Detector (RTD) type sensors
- Simultaneous sampling 16-bit A/D for each channel
- High accuracy (±0.84°C between -60 and 250°C @ 1.6 mA)
- Programmable input range and balance current per channel
- Programmable excitation, per group of 4 channels
- Linear (constant current) operation
- 8th order Butterworth filter with programmable cutoff frequency per channel
- Short to ground on any channel does not affect others
- Up to 12,000 samples per second per channel
- Up to 3 kHz bandwidth
- Operates at extended temperature range of -55 to 105°C
- Temperature measurements with RTD PT100
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