What is correct about sigma - delta ADC ( ADC)? (The answer that best suits the question.)

Question

What is correct about sigma - delta ADC  (    ADC)? (The answer that best suits the question.)

Answer

it is simple and has a smaller quantization noise than traditional ADC with the same oversampling ratio.

Answer

it is usually used in digital voltmeter

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the conversion time increases linearly with number of bits

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is a moderately fast ADC

Answer

it is best for constant analog values

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