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TM4C1290NCZAD: Understanding the priority and sample rate of the ADC sequencers and channels

Chris Lande
Expert 6545 points
Part Number: TM4C1290NCZAD

Team,

Please will you help me understand the relationship between sample rate and sequencing.

Example 1) if I'm using SS1 and I have four different channels in the sequence what is the individua lchannel sample rate of each channel for an ADC sample rate of 1Ms/s.

Example 2)If I'm using SS1 and SS2 with 8 individual channels what is the individual channel sample rate of each channel for an ADC sample rate of 1Ms/s.

Is there any priority over SS0 - SS3?

In what order are SS0 - SS3 serviced?

Thanks.

  • 0
    TI__Guru 72500 points

    It takes at least 500nS to do a single conversion.  When a sequence is triggered, it converts the channels in that sequence in order sequentially. Therefore you cannot have 4 channels in a sequence and trigger that sequence every 1uS. There is not enough time for all four conversions before the sequence is triggered again. Every second trigger would be ignored. In summary, the sample rate is based on the trigger rate but there must be enough time between triggers for all the configured samples to be completed.

    The priority is configurable as described in the datasheet.