ADF5356 issues


We are encountering numerous problems with device operation. Upon power-up all seems to be fine, but a few seconds later the power supply starts draw large amounts of current and some capacitors (ones on the V_ref and V_bias pins) start to burn. 

Has anyone encountered similar behaviour, or does anyone know what might cause such behaviour. The circuit has been copied from the eval board schematics and as far as we can see, there

are no discrepancies. Part of the schematic with ADF5356 is shown below


with the supply section here

Top Replies