• 4A23 20 bit  integrating A-D

The 4A23 is a high resolution, low power, delta-sigma, A-D card for the PC/104 bus. 8 differential or 16 single ended inputs are provided.  The inputs have 500V isolation from system ground for noise elimination and to permit floating measurements.  The 4A23 has 5 programmable input ranges: 25 mV, 50 mV, 100 mV, 1V, 2.5V, and 5V full scale.  All ranges except the 5V range can be bipolar.  A-D input is conditioned with a chopper stabilized instrumentation amplifier for minimum offset drift < 50 nV/oC.  A high quality reference is used to insure overall gain stability of < 10 PPM/oC Conversion rate can be programmed from 3.76 Hz to 202 Hz, with higher rates trading off conversion rate for noise.  The 4A23 can be run in polled or interrupt driven modes, allowing background data acquisition.  Interrupts 2, 3, 4, 5, 7, 10, 11, or 12 can be used.  All calibration information is stored in an on card EEPROM, so no zero or full scale calibration potentiometer are needed.  The low overall power consumption (>300 mW) reduces thermocouple induced offsets that can cause problems in lower input ranges.  An on-card temperature sensor is available for thermocouple cold-junction compensation.  Driver software for background data collection is provided, as is source code for driver and example programs.  The 4A23's reference voltage is brought out to the input connector for ratiometric type applications.

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4A23 20 bit integrating A-D

  • US$257.00


  • 5 or more US$206.00
  • 25 or more US$195.00
  • 100 or more US$186.00