dushan1
Member level 2
the vco out frequency is 320~380MHz ,step frquency 1.25KHz.the reference oscillator is 10MHz,R=5,so the PFD =2MHz,all the frequency can lock well ,but when the pll is locking,there is a 344MHz frequency out,the power is -90dbm.when i change the register N,the 334MHz not change ,when i power down the vco,the 334MHz still stands here. my reference oscillator is sine wave ,no harmonics.when i change the PFD=5MHz,the frequency changes.I want to know whether the ADF4252
will oscillator in such frequecy range .how to avoid it?
thanks!
will oscillator in such frequecy range .how to avoid it?
thanks!