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ADS1230 interfacing 8052

ajith kumar
Intellectual 320 points

Other Parts Discussed in Thread: ADS1230

Dear Bob,

  Thank you for your great suggestion..So I think its good to connect the both ground planes together via a small trace as per your information, Am  i right...! And in my design i also connected 3 inductor in series to AVDD, AINP and AINN for filtering purpose.So,is this safe if connecting those inductors or may damage the device.Should i replace resistors instead of those inductors.If i replaced with resistors,is there any chance to affect the ADC Ic,s performance.......

                                                                                     Thank you 

                                                                                      by Ajit..

  • 0
    TI__Guru** 113765 points

    Ajith,

    Yes, you need to connect the ground planes together at the ADS1230. 

    I generally avoid placing inductance at the supply connections, but depending on operating environment it may be necessary to add filtering.  Adding the inductance can be a concern when the device needs very short current demands.  In one place that this happens is at startup when internal devices are turning on.  This quick current demand can sometimes be choked by the inductance.  You can try using a RC filter combination instead of the inductance for the AVDD supply, but keep the resistance low (10 ohms) to be able to maintain current flow.

    On the analog inputs, I would have provision for resistors and capacitors along with inductances.  In this way you will have the opportunity to try various combinations.  Generally the inductance will choke out high frequency signals (EMI/RFI) and the RC filter will create an anti-aliasing/low frequency filter.

    Best regards,

    Bob B