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ADS1217: How to connect XIN and XOUT when using an oscillator as the clock source

Shinichi Inoue
Guru 20706 points
Part Number: ADS1217

Dear Specialists,

Our customer is considering ADS1217 and has a question.

We would be grateful if you could advise.

---

According to the datasheet P.13 CLOCK GENERATOR, ADS1217 can use oscillator for clock source.

In this case,

How should the XIN and oscillator be connected.

How should XOUT be connected.

Please let me know if there are any other points to note.

Could you please provide an connection example.

ｰｰｰ

I appreciate your great help in advance.

Best regards,

Shinichi

  • 0
    TI__Guru** 113765 points

    Hi Shinichi,

    Connecting an external clock source is not complicated.  When using an external clock source, such as an oscillator, connect the output of the oscillator to the XIN pin of the ADS1217.  The XOUT pin would be left floating as XOUT is only used for crystals or resonators.

    The only consideration are the voltage levels and you must match the levels relative to the DVDD supply of the ADS1217.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Guru 20706 points

    Hi Bob,

    Thank you for your reply.

    I'm happy to get in touch with you.

    I understand how to connect an external oscilator.

    I'll share this information with the customer.

    I appreceiate your great help and cooperation.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    Guru 20706 points

    Hi Bob,

    The customer has an additional question.

    Could you please let me know if you have any information.

    Are there any users using ADS1217 with an external oscillator.

    I appreciate your great help and cooperation.

    Best regards,

    Shinichi

  • 0 in reply to Shinichi Inoue
    TI__Guru** 113765 points

    Hi Shinichi,

    There are advantages of using an external oscillator for several reasons.  Generally startup issues over temperature are resolved due to loading on the crystal that may not start oscillation properly.  Another reason is due to drift as the external oscillator can be better tuned to stay at a particular frequency with a low jitter output. A third reason may be to synchronize multiple devices to the same clock and timing.

    It is difficult to say how may customers have used the external oscillator, but it has been done in the past.

    Best regards,

    Bob B

  • 0 in reply to Bob Benjamin
    Guru 20706 points

    Hi Bob,

    Thank you for your reply.

    External oscillators have several advantages, so I think they are used by various customers.

    I appreciate your great help.

    Best regards,

    Shinichi