參數(shù)資料
型號(hào): LMX2487SQX
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL
中文描述: PLL FREQUENCY SYNTHESIZER, 6000 MHz, PQCC24
封裝: 4 X 4 MM, 0.80 MM HEIGHT, PLASTIC, LLP-24
文件頁數(shù): 26/37頁
文件大?。?/td> 856K
代理商: LMX2487SQX
Programming Description
(Continued)
2.1 R0 REGISTER
Note that this register has only one control bit, so the N counter value to be changed with a single write statement to the PLL.
REGISTER
23
22
21
20
19
18
17
16
15
14
DATA[22:0]
13
12
11
10
9
8
7
6
5
4
3
2
1
0
C0
0
R0
RF_N[10:0]
RF_FN[11:0]
2.1.1 RF_FN[11:0] -- Fractional Numerator for RF PLL
Refer to section 2.6.1 for a more detailed description of this control word.
2.1.2 RF_N[10:0] -- RF N Counter Value
The RF N counter contains an 16/17/20/21 and a 32/33/36/37 prescaler. The N counter value can be calculated as follows:
N = RF_P·RF_C + 4·RF_B + RF_A
RF_C
Max{RF_A, RF_B} , for N-2
FM
-1 ... N+2
FM
is a necessary condition. This rule is slightly modified in the case where the
RF_B counter has an unused bit, where this extra bit is used by the delta-sigma modulator for the purposes of modulation.
Consult the tables below for valid operating ranges for each prescaler.
Operation with the 16/17/20/21 Prescaler (RF_P=0)
RF_N
RF_N [10:0]
RF_C [5:0]
RF_B [2:0]
RF_A [1:0]
<
49
49-63
N Values Below 49 are Illegal.
Legal Divide Ratios are:
2nd Order Modulator: 49-61
3rd Order Modulator: 51-59
4th Order Modulator: 55
Legal Divide Ratios are:
2nd and 3rd Order Modulator: All
4th Order Modulator: 64-75
0
1
.
.
1
1
N values above 1023 are prohibited.
64-79
80
...
1023
>
1023
0
.
1
0
.
1
0
.
1
1
.
1
0
0
0
0
.
1
0
.
1
0
.
1
0
.
1
Operation with the 32/33/36/37 Prescaler (RF_P=1)
RF_N
RF_N [10:0]
RF_C [5:0]
RF_B [2:0]
RF_A [1:0]
<
97
97-226
N Values Below 97 are Illegal.
Legal Divide Ratios are:
2nd Order Modulator: 97-109, 129-145, 161-181, 193-217, 225-226
3rd Order Modulator: 99-107, 131-143, 163-179, 195-215
4th Order Modulator: 103, 135-139, 167-175, 199-211
Legal Divide Ratios are:
2nd and 3rd Order Modulator: All
4th Order Modulator: None
0
1
1
1
.
.
.
.
1
1
1
1
Possible with a second or third order delta-sigma engine.
Possible only with a second order delta-sigma engine.
N values greater than 2045 are prohibited.
227--230
231
...
2039
0
.
1
0
.
1
0
.
1
0
.
0
1
.
1
1
.
1
1
.
1
2040-2043
2044-2045
>
2045
L
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