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how to delimit the bit-stream from delta-sigma ADC?

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szekit

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i understand how does delta-sigma ADC work. what i am puzzled is how does the digital interface know where to delimit the bit-stream and read it in as a word? and by how many bits? what determine the number of bits to chop off for read?
 

The decimative filter downsamples the bitstream from your sigma-dalta modulation ,and output multi-bit such 16 bits ,the the digital part receive 16bits!
 

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