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ADS1225: recommended PCB layout

Shinichi Inoue
Guru 22481 points

Part Number: ADS1225
Other Parts Discussed in Thread: ADS1220

Dear Specialists,

My customer is considering ADS1225.

He'd like to know recommended PCB layout.

I confirmed product folder, but there are no information from ADS1225 datasheet, no EVM and reference design.

Also I could not find similar device to substitute like ADS1225 .

Could you please send me recommended layout.

I appreciate your great help.

Best regards,

Shinichi

  • 0
    TI__Mastermind 25035 points
    Dear Shinichi-san,

    I would recommend to promote ADS1220 in this case. It is kind of the next generation of the ADS1225.
    The ADS1220 datasheet includes an example layout, we have an EVM and many reference designs (TI Designs) available.

    Regards,
  • 0 in reply to Joachim Wuerker
    Guru 22481 points
    Hi Joachim

    Thank you for your reply.

    There is not any useful layout.

    I'll send your suggestion to the customer.

    They have been using ADS1225 for many years, it may be hard to change.

    But It may be referable layout of ADS1220 for ADS1225.

    I appreciate your great help.

    Best regards,
    Shinichi
  • 0 in reply to Shinichi Inoue
    TI__Guru** 100855 points

    Shinichi-san,

    I've taken the ADS1220 layout recommendations and adapted them to the ADS1225. Looking at the ADS1225, there isn't much to the layout. I've placed series resistors for the digital communication pins, bypass capacitances for the digital and analog supplies, and input filtering for the analog inputs. I could have placed similar filtering for the reference pins, but many use a single capacitor as I've shown here.

    The only thing not shown is the pad at the bottom of the device that should be connected to ground. This pad can be connected to ground through one of the GND pins, or through an unused digital pin (either the MODE pin if it is connected to ground or the TEMPEN pin). The pad can also be connected to ground through a via, but the via hole must be small to prevent the solder from being falling into the via.

    The diagram is shown below:

    Joseph Wu

  • 0 in reply to Joseph Wu
    Guru 22481 points
    Hi Joseph,

    Thank you for your reply and helpful support.

    It's really useful.

    I'll send the customer as a reference.

    I appreciate your great help and cooperation.

    Best regards,
    Shinichi