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The “eyADC-DG2” overcomes the disadvantages of capacitive signal sampling by using continuous time Delta Sigma modulators.
The usage of continuous time Delta Sigma modulators in motor control applications avoids the need for further analog signal processing by external circuitries. The reliability and performance of the complete system is increased while minimizing complexity and production costs.
The chip’s sinusoidal input signals are directly fed to resistors, which facilitatea very high input common mode voltage range. Additionally, resistors allow high linearity due to their low voltage coefficients. Continuous time Delta Sigma modulators also provide the advantage of inherent suppression of high frequencies: The input signal is oversampled and a low-pass filter is applied digitally. This provides further immunity against high frequency distortions.