AK8140A Datasheet, PDF (13/45 Pages) Asahi Kasei Microsystems – Programmable Clock Generator

AK8140A
Example1) input 27MHz, output 54MHz
1. fVCO2: 108MHz
ODIVn = 2
2. M2: 1
N2: 4
As the highest common measure of fin2 and fvco2 is 27MHz
3. P:
2
={4-int(log₂4)}
N _INT:
16
={int(4×2²)/1 }
N_NUME:
0
={4×2²-1×16}
N_DEMO：
1
={M=1}
∴MDIV = 2²= 4， NDIV = 16 + (0/1) = 16
Example2) input 27MHz, output 24.576MHz
1. fVCO2: 221.184MHz ODIVn = 9
2. M2: 125
N2: 1024
As the highest common measure of fin2 and fvco2 is 0.216MHz
3. P:
N _INT:
N_NUME:
N_DEMO：
1
={4-int(log₂ (1204/125))}
16
={int(1024×2¹)/125 }
0
={1024×2¹-125×16}
125 ={M=125}
∴MDIV = 2¹= 2， NDIV = 16 + (48/125)
draft-E-06
- 13 -
Sep -12