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GND PAD of LMX2531ELQ1778E

Taichi Noda
Expert 1350 points
Other Parts Discussed in Thread: LMX2531

Hi,All

Let me ask about GND PAD of LMX2531ELQ1778E.

The GND PAD of LMX2531ELQ1778E is divided into two.

If this pad is shorted out,wil we have a problem?

And please tell me the reason of dividing GND PAD.

Best regards.

  • 0
    TI__Mastermind 28011 points

    Taichi,

    It is fine to ground both of the ground pads.

    The reason for dividing the ground pad is that the narrower one is really not attached to the die, but rather for the purposes of alignment of the die in the package.    The LMX2531 has a strange footprint because it uses bond wires for an inductor for the VCO.

    Regards,

    Dean

  • 0 in reply to Dean Banerjee
    Expert 1350 points

    Mr.Dean

    Thank you for quick reply.

    You helped me a great deal.

    At this time I don't receive a detail reason of dividing a ground pad,but if I receive a question that ground pad isn't one by my customer,please tell me it.

    Best regards.

    Taichi.

     

  • 0 in reply to Taichi Noda
    TI__Mastermind 28011 points

    Taichi,

    I am not sure what the , but I can say this.

    The LMX2531 die is actually smaller than the package.  If you look at the bottom two pads, the bigger ground pad is below the die and the narrow sliver is beneath empty space  There is also a narrow sliver, which is really not connected to the die at all, but it is easier to tell people to ground this.

    The datasheet has the recommended land pattern for this.

     

    Regards,

    Dean