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ADS1230 interfacing 8052

ajith kumar
Intellectual 320 points
Other Parts Discussed in Thread: ADS1230

Dear Bob,

I m designing new weigh scale adc board using ADS1230 and 8052  ic.I need to reduce the overall cost by reducing the PCB size.In new design,the adc ic is near to the microcontroller.But i provided different analog and digital ground plane for adc.The percentage of ground plane is lesser when compare to my previous board due to limited space.So will this affect the adc performance.Also can i use ground plane ring for adc to minimize noise.

I also have an idea to replace the components with smd's, Will replacing with smd provide better performance..?Which type of components gives the optimum performance for ADC IC...Expecting your valuable reply..

Thanks and Regards

Ajit.

  • 0
    TI__Guru** 113765 points

    Hi Ajit,

    One major consideration is to make sure that the path between analog and digital ground is low impedance. If some external event (transient) causes the grounds to seperate by more than 300mV you will damage the ADS1230.  Nothing will be better than a good ground plane.

    Noise is not usually reduced by just changing components.  Sometimes smaller SMD components can help to reduce area and make routing cleaner and thus helping reduce the effect of noise.  The best method is to make sure that digital and analog signals do not cross. Capacitors are graded.  C0G/NPO are the best, followed by X7R, X5R, etc.. Capacitor noise differs with dielectric.  There are also temperature/voltage coeffients to consider as well.

    A ground ring may be helpful, but sometimes you might be better served with maximizing the ground plane.

    Best regards,

    Bob B