Overvoltage on the ADAU1701

Hello,

due to a problem within the power supply my ADAU1701 was exposed to a voltage of about 6 volts for about 1 minute.

The IC was pretty warm but still eays touchable. Is there a chance the IC has survived it?

  • Hello x1andy,

    There is a good chance that it did survive and will work properly but the part was obviously stressed and there may be some small damage that may cause an issue in the future. I am always surprised how much punishment some parts will take and still work. Yes, sometimes the slightest thing and the part goes bad.

    So if you are using this as a test bed or a prototype that will stay in your office then you are probably fine and if any future abnormalities crop up then replace the part. If this is a customer unit or something that will be put into long term use then I would replace the part so I could trust its long term reliability.  

    Thanks,

    Dave T

  • Hello Dave T,

    thank you for your quick reply.

    I am using this IC for the purpose of prototyping. It's not for a customer. I am just practicing as a student.

    So I think, I will give it a try!

    Thank you!

  • I powered up my ADAU 1701. I can't communicate with it using SigmaStudio. On pins VOUT0, VOUT1, VOUT2 and VOUT3 are constant 1.5V. Is this ordinary?

    I have the suspicion, the chip is dead...

  • Hello x1andy,

    It is normal. The DAC outputs are biased up at a common mode voltage of AVDD/2.

    What is your hardware setup? Are you using the evaluation board or your own hardware?

    Dave T

  • Hello Dave,

    I use my own hardware. As a template I used the FreeDSP design. I can program the EEPROM. The ADAU1701 doesn't start the self-boot sequence (After Reset, no communication on SCL and SDA lines).