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TMS320F280049C: And different ADC modules(ADCA, ADCB and ....) require synchronization?

Shaoxing Ke
Expert 3590 points

Part Number: TMS320F280049C

Hi Experts,

I am asking for my customer.

And different ADC modules(ADCA, ADCB and ....) require synchronization.

Q1: What will be the impact of non-synchronization? Like the Trigger Overflow.

Q2: Is there detailed comparison data between synchronization and non-synchronization? From the practical application case, thanks~

  • 0
    TI__Mastermind 40370 points

    Hi Shaoxing,

    Shaoxing Ke said:
    Q1: What will be the impact of non-synchronization? Like the Trigger Overflow.

    Simultaneous conversion on more than one ADC with different trigger period and S+H will cause interference between the ADC modules resulting in degraded performance.  When more than one ADC is converting at the same time, ensure that the trigger period and S+H times are maintained for all the ADC as illustrated below:

    Shaoxing Ke said:
    Q2: Is there detailed comparison data between synchronization and non-synchronization? From the practical application case, thanks~

    Refer to the ADC section in the Datasheet.  The DC spec ADC-to-ADC Isolation (effect of ADC to the other ADC during simultaneous conversion) will be less than +/-1LSB during synchronous conversion.  With asynchronous conversion, it will be > +/-1LSB.  In the AC spec, ENOB is severely impacted with asynchronous conversion, hence not specified.  With synchronous conversion, typical ENOB is around 11LSB.

    Regards,

    Joseph

  • 0 in reply to Joseph Casuga
    TI__Expert 3590 points

    Hi Joseph,

    Yes, they want to know the specific data like the how much than the  > +/-1LSB, or more than 11LSB with asynchronous conversion. Thanks~

    Do we have these similar data? Because customer want to use the asynchronous conversion, they don't know exactly how much LSB is lowered for this.