KAM/CDC/101 4 channel Charge-to-digital converter

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  • 4 channel charge-to-digital converter for
  • piezoelectric devices
  • Programmable Input range (±100mV, ±10V)
  • Accuracy 3% FSR error from all sources typical
  • High bandwidth with programmable filters (0.5Hz to 6kHz)
  • 2nd order Butterworth 0.5Hz high pass filter
  • Standard SMC (10-32) sockets per channel
  • 16-bit simultaneous sampling on each channel
  • Up to 24K samples per second per channel
  • Up to 6K Bandwidth


  • Force and pressure measurement using piezoelectric devices
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The KAM/CDC/101 is used to digitize signals from charge-based sensors such as piezoelectric devices used for accelerometers. Each is independent and consists of a charge-to-voltage converter (charge-mode amplifier) followed by a second order high pass filter, sixth order low pass filter, programmable gain amplifier, a second order low pass filter and a separate A/D. 

At the heart of the KAM/CDC/101 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. Unlike most Acra KAM-500 modules, the input connectors are SMC (10-32) sockets for each channel. 

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