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Anyone notice AGND/DGND went away on the latest datasheet for the ADS5463-EP (Oct 2009)? Any ideas what this means?

Fos
Prodigy 90 points
Other Parts Discussed in Thread: ADS5463, ADS5463-EP

I wasn't sure if I was going to implement a GND split reading the ADS5463 base data sheets (July 2009) that show AGND & DGND.

Now I stumble on the latest part I want to use, the ADS5463-EP and it no longer distinguishes these GNDs.

My analog & RF guys are going to have a problem.  I want a good story.  Can anyone help out?  i.e.-- TI support...

 

TTFN
Fos

 

  • 0
    TI__Expert 6040 points

    Fos,

    I am not sure if someone has answered this for you through other e-mail loops, but I just found out this question today, sorry for the delay. I will check out if there is any special reason to change the data sheet about the grounding. Some discussion think split ground could give better noise, but we don’t have test data on this device. On our EVM board we use one ground. Also recent ADC device are designed with multiple ground pins to reduce switching noise impact so one ground should be good. We had tried spilt ground on another lower speed device a few years ago and it doesn’t show better result.

    Regards,

    *** Qing

  • 0 in reply to Hui-Qing Liu
    TI__Expert 6040 points

    Fos,  I have checked out that the reason we changed the data sheet about the grounding suggestion from split Gnd to single Gnd is because we only have the layout data for single Gnd on this device so far. There is no special reason (no failure report) cause this change on the data sheet.

    Regards,

    *** Qing