Why does the ADF4150HV PLL with an external DCMO3288-5 VCO not lock in the 460MHz to 490MHz range?

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Accepted Answer

The issues with the PLL not locking in the 460MHz to 490MHz range are most likely due to the PLL operating out of its specified range. The ADF4150HV is designed to operate with output frequencies above 500MHz. Below 500 MHz, the device can operate if the RFIN signal has a slew rate of 400 V/uS or higher and an input power level between -10 dBm and +5 dBm.

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ADF4150HV : FAQ