Using Crystal with 16.00 MHz instead of 16.384 MHz in AD7858A

Hi! I know that ADE7858A should be clocked via crystal with frequency from 16.22 MHz to 16.55 MHz. Could crystal with 16.00 MHz be used with ADE7858A? What will be happened with power measurements? Regards, Ivan

  • 0
    •  Analog Employees 
    on Jul 23, 2014 4:28 AM

    Hi hmani,

    Thank you for the response. 16.00 MHz crystal is used in every equipment which is produced by Company. So a price for 16.00 MHz crystal is much cheaper than for 16.384 MHz crystal.

    Regards,

    Ivan

  • Hi Ivan

    I am afraid we do not have any evaluation data collected with clock frequency input outside the 16.384 MHz (+1%) specified range. So, I will not be able to tell you exactly how worse the performance would be. I highly recommend that you use clock frequency within the specified range.

    Is there any reason why cannot use frequencies within the range? Or is there is an incentive to prefer a 16.000 MHz crystal?

    Regards

    hmani

  • Hi Ivan

    I am not sure if I can agree with you on this. If I browse for crystals to purchase, I can see that there is no price difference between 16.000 MHz and 16.384 MHz crystals (keeping all other parameters like ESR, load cap, size, etc.. constant). We spec the same crystal frequency on some of our other products, like ADE7878,ADE7880, as well. I haven't heard of such an issue before. Can you add some data (or link to any webpage) supporting your claim that 16 MHz crystals are cheaper than 16.384 MHz ones?

    Regards

    hmani

  • 0
    •  Analog Employees 
    on Jul 28, 2014 3:20 AM

    Hi hmani!

    You right, price for the 16.00 MHz crystal and 16.384 MHz crystal is the same, when volumes is the same. But 16.00 MHz crystal is used in every equipment which is produced by Company so price decreases with high volumes.

    Thank you for the comment.

    Regards,

    Ivan

  • Okay, I get your point now. Thanks for the info, Ivan! The frequency range of operation is something that is determined in the design phase of the project itself. Re-specifying a released product over a different/wider frequency range will be difficult. But we can definitely keep this in mind for future products.

    Regards

    hmani