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ADF5356 supply input

Hi,

In ADF5356 datasheet applications information, a single voltage regulator has been considered for 3.3V  and 5V supply input. Whereas, in evaluation board schematic two no's of 3.3V regulators have been used (One regulator for AVDD and DVDD lines and other for VRF line) as highlighted in the attached file.

Is it really required to used two independent 3.3V regulators or a single voltage regulator is sufficient to drive the IC?

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