CC2640R2F: About The ADC Maximum Sample Rate

Hello User,

the sampling duration (2.7us) refers to the sampling phase only and does not include the conversion phase.

This is somewhat also explained in the TI-RTOS ADC driver documentation:

http://dev.ti.com/tirex/#/?link=Software%2FSimpleLink%20CC2640R2%20SDK%2FDocuments%2FDrivers%2FTI%20Drivers%20Runtime%20APIs

"The analogue to digital conversion process consists of two phases in the CC26XX ADC, the sampling and conversion phases. During the sampling phase, the ADC samples the analogue input signal. The duration of the sampling phase is configurable. Larger input loads require longer sample times for the most accurate results."

2.7 us is the sampling time, not the conversion time. The input is sampled for a given amount of time meaning that the switch at the input is open for the sampling time and the sampled voltage is placed on the internal cap. Then the ADC does the conversion. The sample rate of the ADC is therefore dependent on input sample time + conversion time.