Please help to OPA3355EA/2K5 signal problem

Chen Eric

We used a material from your company on our test card, MPN: OPA3355EA/2K5.

After the measurement, it was found that the signal was abnormal and could not operate normally, such as noise interference.

Do you have any suggestions?

Thanks.

over 4 years ago

0 kai klaas69 over 4 years ago

Guru 140200 points

Hi Chen,

some crosstalk from the enable input to the output is normal. For decreasing the output glitch decrease the load resistance to the allowed minimum. Also, your enable signal is not clean but shows ringing. This can also worsen the output glitch. Some low pass filtering of enable signal could help. Not too much, only to make the edge a bit less steep.

Kai

0 Sima Jalaleddine over 4 years ago

TI__Mastermind 29265 points

Hello Chen,

Would you be able to share the connections to the enable pins? Board layout too if you can share that as well.

Thank you,

Sima

0 Chen Eric over 4 years ago in reply to kai klaas69

Prodigy 10 points

I will try this idea,thanks.

0 Chen Eric over 4 years ago in reply to Sima Jalaleddine

Prodigy 10 points

The board layout is inconvenient to provide, I have noticed that the EN cable may be too long

0 Sima Jalaleddine over 4 years ago in reply to Chen Eric

TI__Mastermind 29265 points

Hello Chen,

I would first try shortening this cable and any other connections to the board as much as possible, and update us if there was any improvement in noise.

Thanks,

Sima

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Please help to OPA3355EA/2K5 signal problem