參數(shù)資料
型號: MB15F83UL
廠商: Fujitsu Limited
英文描述: Fractional-N PLL Frequency Synthesizer
中文描述: 分數(shù)N PLL頻率合成器
文件頁數(shù): 9/29頁
文件大?。?/td> 168K
代理商: MB15F83UL
MB15F83UL
9
(2) Data Setting
RF synthesizer Data Setting (Fractional-N)
The divide ratio can be calculated using the following equation :
f
VCORF
=
N
TOTAL
×
fosc
÷
R
N
TOTAL
=
P
×
N
+
A
+
F
/
Q
f
VCORF
: Output frequency of external voltage controlled oscillator (VCO)
N
TOTAL
: Total division ratio from prescaler input to the phase detector input
fosc
: Output frequency of the reference frequency oscillator
R
: Preset divide ratio of binary 7 bit reference counter (3 to 127)
P
: Preset divide ratio of modulus prescaler (16 fixed)
N
: Preset divide ratio of binary 10 bit programmable counter (18 to 1023)
A
: Preset divide ratio of binary 4 bit swallow counter (0 to 15)
F
: A numerator of fractional-N (0 to 15)
Q
: A denominator of fractional-N, modulo 13
(A < N
2, F < Q)
Binary 7
-
bit Programmable Reference Counter Data Setting
(R
F1
to R
F7
)
Divide ratio (R)
R
F7
R
F6
R
F5
3
0
0
0
4
0
0
0
52
0
1
1
127
1
1
1
Note : Divide ratio less than 3 is prohibited.
Fractional-N incremant of the fractional accumulator Data Setting
(
F1
to
F4
)
Setting value(F)
F4
F3
F2
0
0
0
0
1
0
0
0
2
0
0
1
15
1
1
1
Note : F < Q
R
F4
0
0
0
1
R
F3
0
1
1
1
R
F2
1
0
0
1
R
F1
1
0
0
1
F1
0
1
0
1
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