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[ADV7390] About External Loop Filter of EXT_LF

Question asked by TomY on Sep 9, 2014
Latest reply on Sep 22, 2014 by TomY

Hi, ADI Support Team


I'd like to know about External Loop Filter of EXT_LF as follows.

 

(1) I'll put a specified value by Datasheet (Figure 93 and 94) for the external loop filter, but if I put other value, what kind of phenomenon occurs as the system? And also, if the layout is wrong, what kind of phenomenon occurs as the system?

(2) From viewpoint of device design concept, how did you decide a target value of cutoff of loop filter in case of Output rate 216MHz (16x)?

(3) Is this value considered about the temperature dependency (variability)?

(4) About resistance 170 ohm, which of ±1% or ±5% is recommended as precision?

 

Could you answer each questions, please?

 

Best regards, TomY

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