• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 145 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AM263P4: ADCCLK Prescaler values

Nathan Ostrye
Prodigy 210 points
Part Number: AM263P4
Other Parts Discussed in Thread: SYSCONFIG,

Tool/software:

As I am setting my SysConfig for our AM263P4 project, I am trying to determine what is an acceptable value for the ADC Clock Prescaler. In the Technical Manual, there is the note "To determine an appropriate value for ADCCTL2.PRESCALE, see the device data sheet to determine the maximum SYSCLK and ADCCLK frequency." Currently, the SYSCLK running at 200Mhz, but in the device data sheet, I haven't been able to search down a definitive match to the ADCCLK maximum values. These seems like it would be an easy thing to find, but I'm confounded once again by the inconsistent naming used on the multiple TI products and documents involved here.

I've also looked through several example projects and have seen the ADC Clock Prescaler set to a value of 3 and a value of 4 on different projects, but there are no notes in any of the documentation or code to describe WHY these values were selected. I suspect that I will need the ADC conversion to run as fast as possible in our application, but I want to be able to verify that these ADC settings fall within the published timings.

  • 0
    TI__Expert 4970 points

    Hello,

    The maximum ADCCLK frequency for AM263Px devices is 66.67MHz, which is acquired by setting the ADC Clock Prescaler to a value of 3. An ADC Clock Prescaler value of 4 sets the ADCCLK frequency to 50MHz.

    There is an open ticket to update the datasheet to include the maximum frequency for ADCCLK.

    Thank you,

    Susan