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LMX2485E: FM Modulation

Part Number: LMX2485E
Other Parts Discussed in Thread: LMX2571, , LMX2541

Hi there, I'm contemplating between this chip and LMX2571 (integrated VCO). LMX2571 chip mentions  support for direct FM modulation via SPI.

I can't however find this information on the LMX2485E datasheet. Quick question is, how can I do FM modulation with LMX2485E, and is there a document that describes this?

Best regards,

TH