KAD/ADC/126 4 channel Accelerometer ADC

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The KAD/ADC/126 is used to condition and digitize up to four Single-ended (S/E) analog channels. All of these channels have a constant current source and high-pass (DC-reject) filter for use with integrated charge-amp piezoelectric (ICP) accelerometer devices.

At the heart of the KAD/ADC/126 is a hard-wired state-machine that over-samples all channels at a rate between 200 ksps and 400 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 IIR filter with a default cutoff point set at one-quarter of the sampling frequency (fc =  fs/4).

All signals are sampled simultaneously (isochronously). Thus, when several channels are sampled at different sampling rates, at the start of an acquisition cycle all channels will be aligned.


  • Four accelerometer input channels with Dc reject
  • Programmable input range (±1V, ±10V)
  • High accuracy (gain error of 0.1% FSR typical at 10kHz)
  • Constant current source excitation on each channel (3.6mA typical)
  • Short on any channel does not affect others
  • 16-bit simultaneous sampling on each channel
  • Up to 100 k samples per second per channel
  • Up to 25 kHz Bandwidth (AAAF filter)


  • Accelerometer signal conditioning and digitalization
  • Suitable for ICP, Isotron, Piezotron and Deltatron sensors
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KAD/ADC/126 4 channel Accelerometer ADC

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