KAD/ADC/135 Full/½-bridge ADC (voltage/current excitation, programmable analog gain, FIR/IIR, 6.25 kHz b/w) - 12 channels at 25 ksps

The KAD/ADC/135 is used to condition and digitize up to 12 differential-ended analog channels. At the heart of the KAD/ADC/135 is a hard-wired state-machine that oversamples all channels at a rate between 100 ksps and 200 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). The IIR filter is bypassed in FIR mode with samples output directly from the FIR filter. All signals are sampled simultaneously. When several channels are sampled at different sampling rates, at the start of an acquisition cycle all channels are aligned.

The KAD/ADC/135 supports programmable primary gain, excitation type (current or voltage, with compliance up to 30 mA / ±5.1V), digital filter type as well as completion resistors and high accuracy. Unlike other analog modules, the maximum input voltage range is limited to ±2.5V.

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Features

  • 12 full or ½-bridge, potentiometer or differential ended input channels
  • Simultaneous sampling 16-bit A/D for each channel
  • High accuracy (typically 0.02% FSR)
  • Programmable primary gain for each channel
  • Programmable input range per channel
  • Programmable balance current source per channel
  • Programmable classic shunt per channel (100kΩ)
  • Programmable current or voltage excitation per group of three channels
  • Short-to-ground on any channel does not affect others
  • Completion resistors for ½-bridge configuration
  • 15-tap FIR Kaiser window or 8th order Butterworth (IIR) filter
  • Up to 25 ksps per channel and up to 6.25 kHz bandwidth
  • High impedance per channel when powered off

Applications

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