S1M8831A Samsung Semiconductor, Inc., S1M8831A Datasheet - Page 18

• Manufacturer Part Number: S1M8831A
• Description: Fractional-n Rf/integer-n If Dual Pll Frequency Synthesizer
• Manufacturer: Samsung Semiconductor, Inc.

S1M8831A/33
Programmable Counter (N CoUnter)
If the control bits are 01(IF), 10, and 11(RF), data is transferred from the 24-bit shift register into the N/Frac-latch.
N Counter consists of swallow counter (A counter; 3-bit for IF & S1M8831A RF and 4-bit for S1M8833), main
counter (B counter; 7-bit for S1M8831A/33 RF and 12-bit for IF), and fractional counter (F counter; 17-bit for
S1M8831A/33 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)
18
IF Main Counter Division Ratio (B Counter)
IF_NB_ CNTR[16:5] ; for S1M8831A/33
Swallow Counter Division Ratio (A Counter)
IF_NA_CNTR[4:2] ; for S1M8831A/33
TEST
Division Ratio(A)
Division Ratio(B)
MSB
23
22
OSC
4095
0
1
7
Program Code
3
4
21
IF_CTL_
WORD
[21:19]
19 18
IF_CP-WORD
[18:17]
11
N
N
2
0
0
1
0
0
1
17 16
10
N
1
0
0
1
N
0
0
1
N
0
0
1
1
N
9
0
0
1
IF_NB_CNTR[16:5] ; 3 - 4095
N
8
0
0
1
Division Ratio of the IF N Counter
IF_N[23:0]
N
7
0
0
1
N
6
0
0
1
FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
N
5
0
0
1
N
4
0
0
1
5 4
N
3
0
0
1
IF_NA_CNTR
Control Bits
[4:2] ; 0 - 7
N
2
0
1
1
2 1
N
0
1
1
0
1
LSB
1
0
N
0
1
0
1