neazoi
Advanced Member level 6
Hi, I want to make an all HF bands (1-30MHz) local oscillator for a direct conversion receiver, and I consider using the max038 pll locked with the mc145151.
Can It be done?
I see in the datasheet of max038 that internal or external pll locking is an option and in vact they have made a pll with the mc145151 in the last page.
I need only 1KHz steps and the mc145151 can do it in the HF to 30MHz. Also the max038 is specified to 40MHz actually in the datasheet so I guess if a 30MHz LPF is used at the output this will atenuate harmonics from 15MHz and above.
I consider using a simpler solution with fewer chips, with a varicap (20-500pF) connected either at the Range or the Fadj of the max 038, instead of using all these chips.
Will this work?
Can It be done?
I see in the datasheet of max038 that internal or external pll locking is an option and in vact they have made a pll with the mc145151 in the last page.
I need only 1KHz steps and the mc145151 can do it in the HF to 30MHz. Also the max038 is specified to 40MHz actually in the datasheet so I guess if a 30MHz LPF is used at the output this will atenuate harmonics from 15MHz and above.
I consider using a simpler solution with fewer chips, with a varicap (20-500pF) connected either at the Range or the Fadj of the max 038, instead of using all these chips.
Will this work?