AduCM360 ADC conversion rate


Hi,

I have a problem with AduCM360 ADC conversion rate. I have changed FLT settings, to obtain the best conversion rate, but I cannot get under 2ms. The 2 ms duration is  too much for my application. What settings should I use to get fADC=3906 Hz?

The adc config is : Internal reference, continuous conversion

Looking into table 16 and 17 in UG, I see that to obtain the best rate, i should configure the filters like lines: 1,2,6,7

The main difference that i see is the settling time, that is the best for line 1 in Table 16. Still, I can't get under 2ms per conversion.

Please help!

Thank you!

Ionut

Parents
  • Hi Ionut,

    I just did a calculation in my head there and with 3.9kHz, the settling time is 3 conversions which works out at 0.768 ms, Also note at the bottom of table 16 there's a further delay of 0.256 ms every time you change channels because the ADC is restarted, so that gives you the 1.024ms.

    Is the ~1ms good enough? You have 2 ADCs so that's effectively half of it as you can do 2 channels at once.

    How many channels do you need to sample and in what time?

    Can you do a few samples and then change channels so then you effectively gather more samples in less overall time?

    Regards,

    Alex

Reply
  • Hi Ionut,

    I just did a calculation in my head there and with 3.9kHz, the settling time is 3 conversions which works out at 0.768 ms, Also note at the bottom of table 16 there's a further delay of 0.256 ms every time you change channels because the ADC is restarted, so that gives you the 1.024ms.

    Is the ~1ms good enough? You have 2 ADCs so that's effectively half of it as you can do 2 channels at once.

    How many channels do you need to sample and in what time?

    Can you do a few samples and then change channels so then you effectively gather more samples in less overall time?

    Regards,

    Alex

Children
No Data