AD74413RBCPZ Reference voltage change

Hi JPD,

if the problem appears only at one AD74413R part, I would suggest to replace the part for the new one. 

Output voltage of the Reference cannot be adjusted. I believe, that internal Reference of the part might be damaged.

Regards,

Arnost

Hi Arnost,

What could be the reason for the damage? How can we prevent it from happening again?

Regards,

JPD

Hi JPD,

nature of the issue is still unknown to me.

Does replacing one part helped you to solve the issue? This would indicate that something was damaged at that particular piece of AD74413R.

I would indicate that stressing part above Absolute maximum rating specified in datasheet might cause the problem.  (In this case REFIN or REFOU T -0.3V to +5V.)

Increase voltage at REFOUT pin might indicate, that pin is loaded by current. Could you please check the capacitor, if it is not shorted or damaged. 

If still have part at your board, I would also check all voltages as AVDD, ALDO5V, DVCC, ALDO1V8 and AVSS. This might provide more insights to us.

If you can communicate with it, could you provide "ALERT_STATUS" register reading. 

Regards,

Arnost

Hi Arnost,

Thank you for the inputs.

Well, my Testing team informs me that  AVDD, ALDO5V, DVCC, ALDO1V8 and AVSS. are all within specs, and replacing all MLCCs around the part have made absolutely no difference.

Replacing the defective part made the board functional.

We are at a total loss when it comes to finding the root cause.. causing serious doubts about the robustness of the AD74412R. The part is a wee bit expensive, and we are not happy reworking PCBs for no apparent reasons.

Regards,

JPD

Hi Arnost,

Thank you for the inputs.

Well, my Testing team informs me that  AVDD, ALDO5V, DVCC, ALDO1V8 and AVSS. are all within specs, and replacing all MLCCs around the part have made absolutely no difference.

Replacing the defective part made the board functional.

We are at a total loss when it comes to finding the root cause.. causing serious doubts about the robustness of the AD74412R. The part is a wee bit expensive, and we are not happy reworking PCBs for no apparent reasons.

Regards,

JPD

Hi JPD,

Thank you for clarifying what was the fix for your board.

AD74413R has been on the market for over 4 years with no defects reported. An extensive testing before product release to ensure extended lifetime operation was performed also.

We are happy to run this part through FA (Failure Analysis) to help with narrowing what has happened. If you will be happy to provide damaged sample, please contact directly your sales channel to arrange the part return.

Regards,

Arnost

Hi Arnost,

I am sending the damaged part through sales channel for analysis.

Do let me know about the outcome.

Thanks,

JPD

Hi JPD,

thank you for informing me. I believe you should get report from your sales.

Once you will have report available, feel free to reaching to me.

Regards,

Arnost