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LMX2571 : Direct Conversion IC?

Philip
Expert 1510 points
Other Parts Discussed in Thread: LMX2571

Hi,

Can LMX2571 work as a direct conversion receiver IC (or Zero/Low IF Receiver IC)?

Please advise, thanks.

Thanks,

Philip

  • 0
    TI__Guru** 107550 points
    Hi Philip,
    It is a synthesizer, i.e. it could perform as the local oscillator of a receiver. Whether it could be used in a ZIF receiver depends on your phase noise requirement on the LO. Do you have an idea of the phase noise requirement? we can help check if LMX2571 or any other parts in our portfolio can meet your requirement.
  • 0 in reply to Noel Fung
    Expert 1510 points
    Hi Noel,Thanks for your reply.
    Regarding the phase noise requirement for LO frequency, typically for UHF and VHF,
    -120dBc/Hz @ 25.0kHz; -115dBc/Hz @ 12.5kHz;
    -110dBc/Hz @ 6.25kHz Please advise.
  • 0 in reply to Philip
    TI__Guru** 107550 points
    Hi Philip,
    As you can see in page 8 of the datasheet, the default setting can meet your requirement up to 500MHz. At 900MHz, we are a bit off. My estimation here is we can improve the phase noise by using a higher frequency OSCin and make the loop bandwidth wider.