DS_S1M8837 Datasheet, PDF (16/29 Pages) Samsung semiconductor – FRACTIONAL-N RF/INTEGER-N IF DUAL PLL

S1M8836/37
FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
Programmable Reference Counter(W1[18:2])
If the Control Bit is 00, data is moved from the 22-bit shift register into the R-latch which sets the IF reference
counter. Serial data format is shown in the table below.
MSB
W1[21:0]
LSB
IF_CTL_WORD[21:19]
RF_R_CNTR[[18:17]: 1~3
IF_R_CNTR[16:2]: 3~32767
00
21
19 18
17 16
21
0
Program Code
Division Ratio of the RF R
Counter,RF_R_CNTR
Division Ratio of the
IF R Counter, IF_R_CNTR
Control Bits
• 15-Bit IF R Counter Division Ratio
Division ratio : 3 to 32767(The divide ratios less than 3 are prohibited)
Data are shifted in MSB first.
Division 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Ratio
3
0 0 0 0 0 0 0 0 0 0 0 0 0 11
4
0 0 0 0 0 0 0 0 0 0 0 0 1 00
•
•
•
•
•
•
•
•
•
•
•
•
•
•
••
32767 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
• RF R Counter Division Ratio
Division ratio : 1 to 3
Division Ratio
1
0
1
0
0
1
0
1
2
1
0
3
1
1
16