Optimizing the ADuCM350 for 4-Wire, Bioisolated Impedance Measurement Applications APPLICATION NOTE
●INTRODUCTION
■The ADuCM350 is an ultra low power, integrated mixed-signal metering solution that includes a microcontroller subsystem for processing, control, and connectivity. The processor subsystem is based on a low power ARM® Cortex™-M3 processor, a collection of digital peripherals, embedded SRAM and flash memory, and an analog subsystem that provides clocking, reset, and power management capabilities.
■The ADuCM350 has the ability to perform a 2048 point, single frequency, discrete Fourier transform (DFT). It takes the 16-bit analog-to-digital converter (ADC) output as an input and outputs the real and imaginary parts of the complex impedance.
■The configurable switch matrix on the ADuCM350 allows the user to choose from a 2-wire, 3-wire, or 4-wire impedance measurement.
■This application note details how to set up the ADuCM350 to optimally measure the impedance of a resistor capacitor (RC) type sensor, using 4-wire techniques while targeting IEC 60601 standards.
■To target the IEC 60601 standard, the ADuCM350 is used in conjunction with an external instrumentation amplifier, in-amp, (AD8226) to complete high precision absolute measurements using a 4-wire measurement technique.
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Application note & Design Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2/18 |
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Rev. A |
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AN-1302;AN12168-0-2/18(A) |
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890 KB |
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