S1M8837 Samsung Semiconductor, Inc., S1M8837 Datasheet - Page 19

• Manufacturer Part Number: S1M8837
• Description: Fractional-n Rf/integer-n If Dual Pll
• Manufacturer: Samsung Semiconductor, Inc.

FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
RF Fractional Counter
F Counter Value: -31488(2's complementary) to 31488
NOTE: For a negative integer, the counter value should be inputted as the corresponding 2's complementary binary
Counter Value (F)
MSB
21
RF Fractional Counter Value (F Counter)
FRAC_ CNTR[18:2] ; for S1M8836/37 RF
-31488
31488
code.
For instance, the 2's complementary binary code of -2 is 1 1111 1111 1111 1110.
RF_CTL_WORD[21:19]
-1
-2
2
1
0
Program Code
16
F
0
0
0
0
1
1
1
15
F
0
0
0
0
1
1
1
14
F
1
0
0
0
1
1
0
19 18
13
F
1
0
0
0
1
1
0
12
F
1
0
0
0
1
1
0
11
F
1
0
0
0
1
1
0
W4[21:0]
Division Ratio of the RF Fractional
10
F
0
0
0
0
1
1
1
F 9 F 8 F 7 F 6 F 5 F 4 F 3 F 2 F 1 F 0
1
0
0
0
1
1
0
FRAC_CNTR[18:2]
1
0
0
0
1
1
1
Counter
0
0
0
0
1
1
0
0
0
0
0
1
1
0
0
0
0
0
1
1
0
0
0
0
0
1
1
0
Control Bits
0
0
0
0
1
1
0
0
0
0
0
1
1
0
2 1
1
S1M8836/37
0
1
0
0
1
1
0
LSB
1
0
0
0
1
0
1
0
0
19