9.4.6.1 Analog-to-Digital Conversion

Once the programmed start-up time (ADC_MR.STARTUP) has elapsed, ADC conversions are sequenced by three operating times:

• Tracking time—the time for the ADC to charge its input sampling capacitor to the input voltage. When several channels are converted consecutively, the inherent tracking time is 6 ADC clock cycles. However, the tracking time can be increased using the TRACKTIM field in the Mode register (ADC_MR) and the TRACKX4 bit in the Extended Mode register (ADC_EMR).
• ADC inherent conversion time—the time for the ADC to convert the sampled analog voltage. This time is constant and is defined from start of conversion to end of conversion.
• Channel conversion period—the effective time between the end of the current channel conversion and the end of the next channel conversion.