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KAD/ADC/109/QB120 8 channel A/D converter

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KAD/ADC/109/QB120 Product Sheet

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Features

Eight ¼-bridge (3-wire) input channels for ¼-bridge 120Ω strain gages
16-bit A/D simultaneous sampling on all channels
High accuracy (max. 0.08% FSR at unity gain)
Programmable excitation, balance current and range per channel
8th order Butterworth filter with programmable cutoff frequency per channel
Excitation shorted to ground on any channel does not affect others
Excitation and balancing before instrumentation amplifier
Up to 24,000 samples per second per channel
Up to 6 kHz bandwidth (AAAF filter)

Applications

120Ω ¼-bridge strain gages

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8-ch. A/D converter, with current exc. and sig. cond. for ¼-bridge 120Ω strain gages. 8ch at 24Ksps

The KAD/ADC/109/QB120 provides independent excitation for up to eight channels and is intended for ¼-bridge 120Ω-strain-gage type applications. Each channel has a separate programmable amplifier, programmable filter and A/D converter.

At the heart of the KAD/ADC/109/QB120 is a hard-wired state-machine that over-samples all channels at a rate between 96 ksps and 192 ksps, and digitally filters any noise above the user-programmable cutoff frequency. This is achieved using cascaded, half-band, decimate by 2, 15 tap, finite-impulse-response (FIR) filters with 32-bit coefficients followed by an 8th order Butterworth IIR filter with a default cutoff point set at a quarter of the sampling frequency.

The current through the gage is programmable (up to 25 mA in 6.35 µA steps) and is kept constant. As the resistance changes, the voltage across the gage (and hence as seen by the amplifier) changes linearly.

All signals are sampled simultaneously. This means that even when several channels are sampled at different sampling rates, the sample at the start of the acquisition will always be synchronized.

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