KAD/ADC/114 Full-bridge ADC (voltage excitation, strain gages, 3 kHz b/w) - 16 channels at 12 ksps

The KAD/ADC/114 is used to condition and digitize up to 16 differential-ended analog channels. At the heart of the KAD/ADC/114 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.

Excitation on the KAD/ADC/114 is programmable using four D/A converters, each of which is connected to two pairs of drivers. If more than eight excitations are required, each excitation output can be connected to two bridges.

The KAD/ADC/114 is available with three different input ranges (±10V, ±1V, and ±100mV). The input range must be specified when ordering.

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Features

  • 16 full or ½-bridge, potentiometer or differential ended input channels
  • Simultaneous sampling 16-bit A/D for each channel
  • High accuracy (up to 0.01% FSR typical)
  • Programmable input range and balance current per channel
  • Eight excitation outputs from four programmable D/A converters
  • 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
  • Bipolar excitation and balancing before instrumentation amplifier
  • Enhanced mechanical strength between motherboard and daughterboard

Applications

  • High impedance bridge sensors
  • Differential voltage measurement
  • Strain gage measurement
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