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ADS1230 interfacing 8052

ajith kumar
Intellectual 320 points

Dear Bob,

    First thanking you for the great support..

    I designed a new pcb and i need to clarify one important issue regarding Analog Ground and Digital ground.   In my new design i separated the AGND and DGND into two sections...So my doubt is,  is there any necessity to interconnect  these two GROUNDS(AGND and DGND) together.If interconnected is there any chance to pass the noise from 'digital ground' to 'analog ground'.Or should i place an inductor in between AGND and DGND.Please suggest me an idea regarding this issue....expecting your valuable reply..

                                                                                            Thank you

                                                                                                     by Ajit.

  • 0
    TI__Guru** 113765 points

    Ajith,

    The grounds must be connected together with a low impedance connection.  An inductor can place a high impedance potential and it's use is not advised to place an inductance between grounds.  As the device requires that no more than 300mv potential be placed between the ground pins, a high frequency event ( such as EMI/RFI) can place a potential much larger than 300mv across the inductance and damage the device.

    The best thing to do is to keep your signals separate as you have said and then join the ground connections together somewhere very close or under the device.

    Best regards,

    Bob B