PLL loop filter selection

bandpass

As we know, the number 1 LPF in schematic is the well known circuit.

5 r% S1 p4 s; p- Q5 l. u! f( m   But some application is like the number 2 LPF in schematic. Any commetions about it ?
( T) a  }  T+ u# `
   Any discussion is appreciated.

circuitman5566

thank you so much! thank you so much! thank you so much!