S1M8836 Samsung Semiconductor, Inc., S1M8836 Datasheet - Page 17

• Manufacturer Part Number: S1M8836
• Manufacturer: Samsung Semiconductor, Inc.

FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
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
Division ratio: 3 to 4095 (The division ratios less than 3 are prohibited)
Division Ratio: 0 to 7, B>A
MSB
21
Division
Ratio(B)
IF Main Counter Division Ratio(B Counter)
IF_NB_ CNTR[16:5] ; for S1M8836/37
Swallow Counter Division Ratio (A Counter)
IF_NA_CNTR[4:2] ; for S1M8836/37
4095
Division Ratio(A)
3
4
CMOS
0
1
7
Program Code
11
0
0
1
19 18
IF_CP_WORD
10
0
0
1
[18:17]
9
0
0
1
17 16
8
0
0
1
2
0
0
1
IF_NB_CNTR[16:5] : 3 - 4095
Division Ratio of the IF N Counter
W2[21:0]
7
0
0
1
6
0
0
1
5
0
0
1
1
0
0
1
4
0
0
1
5 4
IF_NA_CNTR[4:2] :
3
0
0
1
0 - 7
Control Bits
2
0
1
1
0
0
1
1
2 1
1
1
0
1
0
S1M8836/37
LSB
1
0
1
0
1
0
17