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ADC offset calibration of BelaSigna 300 Series

Posted: 09 Apr 2009     Print Version  Bookmark and Share

Keywords:analogue-to-digital converters  BelaSigna 30  calibration 

This application note by ON Semiconductor explains the way the analogue-to-digital converters (ADCs) on BelaSigna 300 are calibrated, and why this calibration is recommended. The intended audience is customers building applications using the BelaSigna 300 WLCSP chip who need to calibrate BelaSigna 300 at the production line. In this case, the SPI EEPROM attached to BelaSigna 300 will be loaded with the ADC calibration values. To accomplish this, a calibration script is provided.

BelaSigna 300 features 4 ADC channels. Each of these channels has 8 possible gain settings, for a total of 32 values for complete calibration. Calibrating each of these settings is done independently of the others. All development boards shipped from ON Semiconductor come with all 32 values pre-calibrated, however, when producing an assembly featuring BelaSigna 300, it will be more efficient to only calibrate the settings that are used in a given design.

The main goal of this application note is to describe how the calibration should be performed, and what should be taken into account to ensure proper calibration. It is not intended to provide deep technical explanations on the DC offset effects. However, more details on how the DC offset impacts the audio quality can be found in Appendix A of this application note.

View the PDF document for more information.

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