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OPT8241: configuration frequency question

user4712358
Prodigy 20 points
Part Number: OPT8241

Hello, We want to develop products based on Opt8241. we have some question as below, please help ~
1.The Opt8241-CDK-EVM board have 5 built-in operating profiles, we find all configuration use the frequency 40MHZ and 60MHZ. The frequency is fixed for the opt8241-CDK-EVM ? or We can change the frequency for better performance ? and how to confirm it ?
2.The voxelview have the extraLongrange profile, the frequency is 25.5MHZ and 34MHZ. In my understanding, the frequency is slower, the performance is better when improving the frequency ,for example 50MHZ and 60MHZ. is it right ? I want to know how to decide the best frequency?

  • 0
    TI__Expert 3495 points

    Hello,

    In actuallity, ToF does nothave frequency hardware registers, but rather several hardware clock divisors working together to give rise to a desired frequency.  In our SDK, we provide "mod_freq1" and "mod_freq2" shadow registers that let you specify the frequencies, and the code internally computes the proper divisors.  We also provide the 'unambiguous range' shadow register that let you specify the unambiguous range, and then the SDK computes the required dual-frequency combination, and from the frequencies, computes the hardware divisors. 

    In other words, you can't specify the two frequencies and unambiguous range at the same time.  If you do, unambiguous range will override the frequencies you previously programmed.

    Now, given an unambiguous range, there are multiple frequency combination that can achieve the range.  The SDK internally give preference to 40MHz and 60MHz combination.  Hence your observation.

    The attached Excel gives you idea how to achieve other frequency combinations.

    -Larry8117.DealiasCalc_v2.xlsx