AD8556-EVALZ

Hi AkiraO ,

Good day. JP3 connects the ADG3304 pin 14 (Vccy pin) to the Vdd used in the board. This will power up the ADG3304. You can use either of these options to power up ADG3304: (1) shorting/putting JP3 which will use the Vdd or (2) applying an external voltage source P1 pin 5. Please refer to the image for reference. 

Hope this helps.

Regards,
Gilbeys

Hi Gilbeys,

Thank you for your reply. But I'm little bit confusing. When we short JP3, 5V from USB (it was supplyed from PC) and +2.5V from VDD (it was supplyed  power supply) are short. And we find also JP2. When we short JP2, -2.5V from VSS (it was supplyed power supply) are short. 

AD8556CP-EBZ don't have JP2 and JP3. Why AD8556-EVALZ has JP2 and JP3? We don't need power supply for VDD and VSS? Is it supplied USB instead of VDD and VSS? I don' find like that description on the UG-896. 

Best regards,

Akira

Hi AkiraO ,

Good day. Shorting JP3, the supply would be from 2.5 V Vdd. As for JP2, if you short the JP2, the Vss should be connected to the ground and the value should be 0 V. Upon checking, the JP2 and JP3 jumpers should also be available for AD8556-EBZ. I will ask the author of the manual why it was removed from the user guide. However, in general, you should disconnect JP2 during your evaluation to ensure that Vss will be at -2.5 V. Also, you can disconnect JP3 but ensure that there is a 5 V supply on the USB_VBUS. 

Regards,
Gilbeys

Hi Gilbeys,

Thank you for your support!

Akira

Hi Gilbeys,

Thank you for your support!

Akira

Hi,

I believe that the question has been answered already so I am closing this thread. In case there will be additional questions, feel free to reply to this thread. Thank you!

Regards,

Paul