DS_S1M8837 Datasheet, PDF (17/29 Pages) Samsung semiconductor – FRACTIONAL-N RF/INTEGER-N IF DUAL PLL

FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
S1M8836/37
Programmable Counter(N Counter)
If the Control Bits are 01(IF), 10, and 11(RF), data is transferred from the 22-bit shift register into the N/Frac-
latch. N Counter consists of swallow counter(A counter; 3-bit for IF & S1M8836RF and 4-bit for S1M8837RF),
main counter(B counter; 7-bit for S1M8836/37 RF and 12-bit for IF), and fractional counter(F counter; 17-bit for
S1M8836/37 RF). Serial data format is shown below.
IF N Counter
MSB
W2[21:0]
LSB
CMOS
IF_CP_WORD
[18:17]
IF_NB_CNTR[16:5] : 3 - 4095
IF_NA_CNTR[4:2] :
0-7
0
1
21
19 18
17 16
54
21
0
Program Code
Division Ratio of the IF N Counter
Control Bits
• IF Main Counter Division Ratio(B Counter)
IF_NB_ CNTR[16:5] ; for S1M8836/37
Division
11 10
9
8
7
6
5
4
3
2
1
0
Ratio(B)
3
0
0
0
0
0
0
0
0
0
0
1
1
4
0
0
0
0
0
0
0
0
0
1
0
0
•
•
•
•
•
•
•
•
•
•
•
•
•
4095
1
1
1
1
1
1
1
1
1
1
1
1
Division ratio: 3 to 4095 (The division ratios less than 3 are prohibited)
• Swallow Counter Division Ratio (A Counter)
IF_NA_CNTR[4:2] ; for S1M8836/37
Division Ratio(A)
2
1
0
0
0
0
0
1
0
0
1
•
•
•
•
7
1
1
1
Division Ratio: 0 to 7, B>A
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