find out adc sampling time

RE: find out adc sampling time

Jørgen Holmefjord — Thu, 18 May 2017 12:07:18 GMT

There is no good way to test this. If the SAADC is put into continuous mode by using PPI/shorts to trigger sampling, you will be able to achieve a sampling rate of 1/(tACK + tConv) (with a single channel enabled). You could try toggling a GPIO on the SAMPLE task and DONE event using PPI and measure the time using an oscilloscope. Take a look at this example.

RE: find out adc sampling time

pavanvulichi — Tue, 16 May 2017 14:01:32 GMT

hello sir,in data sheet the sampling rate is 200k samples/sec when tACQ is 3usec & tCONV= < 2µs .But i want to test the exact sampling rate by using example code saadc. can you give any suggestion that how can i find out sampling rate by using example code saadc. In that example there is a timer 400ms for sampling 5 samples. But my goal is to find how many samples can sampled for 1 second.Can any one suggest me how to find no.of samples sampled for 1 second.

RE: find out adc sampling time

Jørgen Holmefjord — Tue, 16 May 2017 09:37:57 GMT

The sample time will be the acquisition time, tACQ, that you configure in your application, pluss the conversion time, tCONV = < 2µs. I don't understand what you are asking for.