how to design a high performance PCB to assess ADC performance ？

Hi BeginnerInAnalog ,

Here are some of my insights to your concern:

• You need to take note of the type of components, specifically the capacitors (e.g ceramic capacitor, x5r, and etc.), used from its datasheet.
  
  
  
  
• You can check its user guide for its design files: EVAL-AD76XXEDZ: Evaluation Board For PulSAR 48 Lead ADCs (analog.com)
  

• You can try checking the links given:
  • (+) AD738x-4: FAQ - Documents - Precision ADCs - EngineerZone (analog.com)
  • Microsoft Word - EDch 12 pc issues.doc (analog.com)
  • MAX8632 PCB Layout Optimization | Analog Devices
    
    

Please let me know if ever these insights will help you so that I could further assist you.

Thanks and regards,
Jo

Hi BeginnerInAnalog ,

To get the full performance with a board connected to a computer is quite tricky and sometimes it does not depend only on the layout but also on the setup.

Normally the Vref should be as close as possible to the ADC, supplies for the ADC should be as clean as possible and the PSRR of the amplifiers should be high enough to avoid introducing noise into the measurements.

you should also try to avoid noisy signals crossing sensitive paths.

In terms of the set-up, if you are reading the data with a laptop, try to use the laptop floating in battery mode and try to avoid using usb to read the data. 

In my experience, the instrument used to generate the signal also introduces some noise into the system if there are ground loops, so I normally connect the ground of the PCB to the chassis of the instrument or protective earth.  

Regards

Joan

thank you for your reply

thank you for your reply

I saw some of the ADI's EVAL board also contain the DESIGN & INTEGRATION FILE,does these files contain some PCB examples?

Hi BeginnerInAnalog ,

Yes. Some device's PCB designs are also included in these design files. You could try looking at it and use it as your reference as this were already made for the device's optimal performance. 

Warm regards,
Jo