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AD-FMCOMMS2-EBZ (AD9361) IO Voltage

Question asked by MilanZ on Nov 24, 2016
Latest reply on Nov 29, 2016 by MilanZ


The link reads as follows:


The AD-FMComms2 (AD9361) assumes a VDD_INTERFACE voltage between 1.71V and 2.625V (1.8 to 2.5 +/- 5%), so on your FPGA carrier board, you should ensure that VADJ is between these levels. Setting things to 3.3V will damage the part.


The way I interpret this statement is that the AD-FMComms2 (AD9361) is supplied off of the FMC HCP connector.


Having said that, the following findings seem to be in contradiction to the conclusion above:

1.  Schematics Rev E., page 4 shows a local 1.8V supply connected to the FMC ADJ pins (H40, G39).

2.  Schematics Rev E., page 4 shows the following note: VADJ (0-3.3V) 2A

3. ZC706 carrier card, page 53, shows a local 2.5V supply connected to the FMC ADJ pins (H40, G39). 


May I ask you to clarify whether AD-FMComms2 (AD9361) card requires an external voltage on FMC ADJ pins (H40, G39)?


Many thanks in advance,