ADF4356_REF_conditions

I have one question.Please tell me.

The data sheet of ADF4356 has the following description.

"For f < 10 MHz, ensure slew rate > 21V/µs"

Is there a recommended slew rate when REF = 12MHz?

Because I'm worried about the effects of phase noise and delay.

Best Regards.

Parents
  • +1
    •  Analog Employees 
    on Jan 12, 2021 10:44 AM 1 month ago

    Regardless of frequency, it is suggested to use high slew rate references as it directly affects the jitter performance. Given specification is to make the part operational for frequencies lower than 10 MHz as it minimum input frequency spec. Part can work with low slew rate references at higher frequencies but performance will be highly degraded. Square waves are tend to have higher slew rates than sinewaves and suggested. Slew rate of sinewave is dependent on its frequency and amplitude. Increasing the amplitude of a sinewave reference will provide better slew rate and better output performance. 

    Alternatives of reference sources can be evaluated and the one having the highest slew rate can be preferred.

Reply
  • +1
    •  Analog Employees 
    on Jan 12, 2021 10:44 AM 1 month ago

    Regardless of frequency, it is suggested to use high slew rate references as it directly affects the jitter performance. Given specification is to make the part operational for frequencies lower than 10 MHz as it minimum input frequency spec. Part can work with low slew rate references at higher frequencies but performance will be highly degraded. Square waves are tend to have higher slew rates than sinewaves and suggested. Slew rate of sinewave is dependent on its frequency and amplitude. Increasing the amplitude of a sinewave reference will provide better slew rate and better output performance. 

    Alternatives of reference sources can be evaluated and the one having the highest slew rate can be preferred.

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