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ADS1299-4: an external clock other than 2.048MHz can be used for ADS1299-4?

yang yang2
Expert 1420 points
Part Number: ADS1299-4
Other Parts Discussed in Thread: ADS1299

Hello, TI experts

2.048MHz clock is not easy generated on our design. But 4.096MHz or 8.192MHz is easier for me, what about the noise performance if these clocks used for ADS1299?

Best Regards

Yang

  • 0
    TI__Guru**** 180941 points

    Hello Poster!

    Our support staff is taking time with their families for the Independence Day holiday here in the US.  It may be July 8th before we can get back to you with help on your query.  We apologize in advance for the delay and will get back to you as soon as possible.

  • 0 in reply to Tom Hendrick
    TI__Guru 66346 points

    Hello Yang,

    Thank you for your post.

    Is there a reason you cannot use the internal 2.048-MHz oscillator? The internal oscillator can be selected by connecting the CLKSEL pin to DVDD through a pull-up resistor.

    If for some reason you require an external clock frequency, you must satisfy the master clock input frequency restrictions in the Recommended Operating Conditions table. This will require you to divide down the 4.096-MHz or 8.192-MHz clock options in your system.

    Best regards,

  • 0 in reply to Ryan Andrews
    Expert 1420 points

    Hello, Ryan

    Thank you for the reply. Yes, external clock is generated from the PLL on MCU. It is 8.192MHz at least. So is there a TI chip can divide down the clock?

    BR

    Yang

  • 0 in reply to yang yang2
    TI__Guru 66346 points

    Hello Yang,

    Yes - TI does offer a variety of solutions for clock dividers. Please refer to the Clocks & Timing section of our product portfolio.

    Just to be clear, the ADS1299 contains its own internal 2.048-MHz clock, so the customer can use this instead of an external clock. 

    Best regards,