Regarding output voltage fluctuation when switching gain

Hi Yuya ,

Thank you for reaching out and for considering the AD8338 for your application. 

Regarding the fluctuation you're experiencing when changing the gain, I'd like to gather a bit more information to better assist you. When you tested the AD8338 using the EVAL-AD8338 board, did you set it up with a single-ended input to a differential output configuration? This setup typically involves using the ADA4940-1 as a differential driver amplifier.

Could you please confirm how you've configured the inputs and whether the ADA4940-1 is part of your setup? Also, can you share your scope shots in the output. This information will help us to pinpoint the cause of the fluctuation and find a solution for you. 

Thanks,

Mae

It appears that the above question has been answered already so I'm temporarily closing this thread. In case there are additional questions, feel free to reply to this thread. Thank you!

Hi, maarmas

Thank you for answering! And sorry for the late reply.

The jumper settings for each are listed below.
J5: Connect the lower two
J6: Connect the upper two
J7: connect two
J8: connect two
(Settings are as shown on the silk sheet, SE->DE)

Is Normal a single-ended input?

Scope shots cannot be posted here. sorry.

Best regards.

Yuya

Hello Yuya ,

The jumper settings shows that the board is configured as single-ended input to differential output. Normal signifies a differential input to differential output. 

I hope this information helps.

Thanks,

Mae

Hello Yuya ,

The jumper settings shows that the board is configured as single-ended input to differential output. Normal signifies a differential input to differential output. 

I hope this information helps.

Thanks,

Mae