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C8051F35X delta-sigma ADC user's guide

Posted: 05 Aug 2008     Print Version  Bookmark and Share

Keywords:delta-sigma  analogue-to-digital converters  oversampling  noise shaping 

Delta-sigma analogue-to-digital converters (ADCs) are oversampling ADCs: to reduce noise and analogue front-end circuit cost and complexity, they sample signals at very high rates and produce a low-noise, high-resolution output. Oversampling at a "high" rate means sampling a signal at a frequency that is well above the bandwidth of interest's Nyquist rate and is done to lower in-band noise. The output word rate of the ADC will be close to the bandwidth of interest.

Delta-sigma ADCs also add benefit by shaping noise and digitally filtering the information to enhance performance. The oversampling, noise shaping, and digital filtering allow highly linear, high-resolution signal measurements, and reduce the cost and complexity of circuits that must filter the signal at the input of the ADC.

Delta-sigma ADCs oversample a signal and produce relatively low output data rates and are best used in applications requiring high precision measurements (16 to 24 bits) of low-bandwidth signals (i.e., typically 20kHz or less). Example applications include digital phones, temperature measurements, pressure measurements, and weigh-scales.

View the PDF document for more information.





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