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ADF4360-0 can not lock

Question asked by zoujx on Dec 22, 2010
Latest reply on Dec 22, 2010 by zoujx

I used adf4360-0 to synthesize a 2.5GHz clock, but the clock can not lock. the schematic, ADISimPLL simulation file and register configuration values are attached.

The 3-wire interface is controlled by a FPGA, and the interval between the control latch and N counter latch is about 15ms.

 

will somebody give me some opinions about the problem here. thanks sincerely.

 

note: there is an error in the schematic, the AVDD, DVDD and VCCO are derived from a "VCC3V3A1" which is generated by a LT1761(max output current is 100mA) and there are serial capacitances between them and the "VCC3V3A1", so i solder 0R resistances instead.

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