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problem with my custom board

Question asked by osamu.fu64@gmail.com on Jun 16, 2018
Latest reply on Jun 18, 2018 by Vinod

I designed a new board with the ad9361.i have a problem in the hardware setup phase.my board looks like to  AD-FMCOMMS3-EBZ board.when i connect  AD-FMCOMMS3-EBZ to power supply.It takes a little current from the source.

 

but when i connect my board to power supply it does not take any current from the source

 

 

I checked the 1.3 volt voltage below the ad9361 pins and other voltage pins,that's all right

 

 

 

i tested my board with vc707 eval board.but unfortunately it does not work.

My board has a few differences with  AD-FMCOMMS3-EBZ

1- I2C EEPROM (M24C02-WDW6TP) is DNP(not populated by default)

2- I2C ADC(AD7291BCPZ) is DNP(not populated by default)

3- I used 3.3v oscillator crystal as input clock(XTALN)

 

Are these E2PROM,I2C ADC is effective?

Is the 3.3-volt oscillator effective?Does 3.3v oscillator crystal  damage the ad9361?

 

 

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