cPCI/PXI Isolated Bridge Signal Conditioner with 16-Bit ADC Module

The CP248 is a single-width, 6U, CompactPCI/PXI module with 4 channels of Bridge Signal Conditioning feeding 4 independent 16-bit Analog to Digital Converters (ADC). This single-width solution incorporates both signal conditioning and ADC to eliminate the need for complex field wiring.

The CP248 supports 10 wire transducer connections and contains fully programmable gain, shunt calibration, bridge balance, excitation and filter on a per channel basis. The maximum sampling rate of each analog to digital converter is 250 Ksamples per second. The ADC per channel architecture generates simultaneously sampled signals. PXI trigger and/or the front panel expansion bus provide a means to connect multiple CP248s together to expand the simultaneously sampled channel count.

cPCI/PXI 16-Bit ADC Bridge Signal Conditioner Module: CP246

CP248 Data Sheet

Supporting Software

Supporting Chassis

US Price/CH Start at: $2,073

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Two buffered outputs are provided with the CP248. One buffered output is a pre-filter that is at the sensor input ground potential. The second buffered output is an isolated version of the input signal at chassis potential. This second output can be selected to be either pre-filter or post-filter.

The CP248 bridge conditioner provides isolated inputs with operation up to ±300V common-mode, bridge completion, isolated excitation supplies, anti-alias filters and amplification. On-board bridge completion handles 120Ω, 350Ω or 1000Ω bridges in ¼, ½ and full configurations. The per-channel excitation sources are programmable from 0 to 10 volts in 4096 steps and contain alarm circuitry to monitor excitation supply health. Each channel can be programmed for either voltage or current excitation. Software selectable filter cutoff frequencies are programmed on a per-channel basis and include 20Hz, 200Hz, 500Hz, 1kHz, 2kHz, 5kHz, 25kHz, 50kHz and filter bypass (wideband). Programmable gain settings of 1, 2, 5, 10, 20, 50,100, 200, 500, 1000, 2000, 5000 and 10000 are provided. Bridge offsets may be nulled using on-board 12-bit DACs.

8248AU / CP248 Introduction

8248AU / CP248 Demonstration

cPCI/PXI Module Features

  • Single Slot Solution for Bridge Conditioning and 16-Bit ADC
  • 4 Channels of Isolated Bridge Signal Conditioning
    with Independent ADCs
  • Isolated Inputs and Excitation
  • 16-Bit ADC Resolution
  • 16-Bit 250 Ks/s ADC per Channel
  • 300 Volts Common-Mode
  • Bridge Completion for 1, 2, or 4 Active Arms
  • Voltage and Current Excitation
  • Programmable Shunt Calibration, Gain & Excitation per Channel
  • 6-Pole, Low Pass Filter with Programmable Cutoff
    from 20 to 50 kHz
  • Programmable Bridge Balance
  • Filtered and Wideband Analog Outputs
  • Programming-Free Operation with SoftView

cPCI/PXI Module Ordering Information

CP248 Products and Part Numbers
Isolated Bridge Signal Conditioner with 16-bit ADC
6U Single-Width cPCI/PXI Module,
with 4 Input Channels Configured with:
x = Filter Option, select one:
B = 6-Pole Bessel
K = 6-Pole Butterworth
y = Completion Resistors, select one:
A = 120Ω
B = 350Ω
C = 1000Ω