AN 669: Drive-On-Chip Design Example for Cyclone V Devices

ID 683466
Date 5/15/2022
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9.7.2. Sigma-Delta ADC Interface for DC-DC Converter

This interface is like the sigma-delta ADC interface for the motor drive axes.

The interface samples the 20-MHz 1-bit ADC signal inputs and applies a low pass sinc3 filter. Unlike the ADC interface for drive axes, the ADC Interface for the DC-DC Converter demodulation is always running and it generates filtered 16-bit results at 156.25 kHz, which is 1/128 of 20 MHz.