Optimizing the ADuCM350 for Impedance Conversion APPLICATION NOTE
●INTRODUCTION
■The ADuCM350 is an ultralow 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 collectionof digital peripherals, embedded static random access memory (SRAM) and flash memory, and an analog subsystem which provides clocking, reset, and power management capability.
■This application note details how to set up the ADuCM350 to optimally measure the impedance of a resistor capacitor (RC) sensor using a 2-wire measurement approach. To optimize the accuracy of the impedance measurement, the user must maximize the usage of the 16-bit analog-to -digital converter (ADC) range.
■To maximize this usage, the peak-to -peak excitation output voltage, transimpedance amplifier (TIA) resistance/capacitance (RTIA/CTIA) combination, and the calibration resistor (RCAL) must be calculated. The maximum allowed current into the loaddominates the calculation.
■If there is no limitation, the user has the ability to maximize the amount of signal swing into the ADC from the TIA to get the best signal-to -noise ratio (SNR) possible.
■However, if there is a limitation on the load current, for example, to meet IEC 60601 standards in 2-wire, bioimpedance applications, the user must calculate the maximum allowable current and use precautionary measures in the circuitry.
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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. B |
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AN-1271;AN11933-0-2/18(B) |
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785 KB |
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