KAD/ADC/109/QB120 ¼-bridge 120Ω ADC (current excitation, programmable analog gain, 6 kHz b/w) – 8 channels at 24 ksps

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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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
  • Programmable excitation 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 before instrumentation amplifier
  • Up to 24,000 samples per second per channel
  • Up to 6 kHz bandwidth
  • Enhanced mechanical strength between motherboard and daughterboard
  • High impedance per channel when powered off

Applications

  • 120Ω ¼-bridge strain gages
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