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Resolver motor control systems typically have used either closed-loop Resolver-to-Digital Converters (RDCs) or open-loop Analog-to-Digital Converters (ADCs) to obtain position and velocity data from the resolver outputs. TI has developed a new method of resolver decoding using the dual delta-sigma modulator ADS1205 and the AMC1210, a digital filter device designed specifically for use in motor control applications.
This technique uses the flexibility of the AMC1210 by providing a carrier signal and digital demodulation of a constant bitstream supplied by the ADS1205. This solution provides 16-bit demodulated data for angle calculations to the microcontroller at a higher speed and lower cost than typical 16-bit systems.
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