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參數資料
| 型號： | LMX2471 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3.6 GHz Delta-Sigma Fractional-N PLL with 1.7 GHz Integer-N PLL |
| 中文描述： | 3.6 GHz的Δ-Σ分數N與1.7 GHz的整數N分頻PLL鎖相環(huán) |
| 文件頁數： | 27/36頁 |
| 文件大?。?/td> | 458K |
| 代理商： | LMX2471 |
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Programming Description
(Continued)
2.2 R1 REGISTER
REGISTER
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DATA[19:0] ( Except for the RF_N Register, which is [22:0] )
RF_R[5:0]
C3
0
C2
0
C1
0
C0
1
R1
RF_PD
1
RF_FD[11:0]
2.2.1 RF_FD[11:0] -- RF PLL Fractional Denominator
The function of these bits are described in section 2.8.2.
2.2.2 RF_R [5:0] -- RF R Divider Value
The RF R Counter value is determined by this control word. Note that this counter does allow values down to one.
R Value
1
...
63
RF_R[5:0]
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
1
.
1
2.2.3 RF_PD -- RF Power Down Control Bit
When this bit is set to 0, the RF PLL operates normally. When it is set to one, the RF PLL is powered down and the RF Charge
pump is set to a TRI-STATE mode. Because the EN pin and ATPU[1:0] word also controls power down functions, there may be
some conflicts. The order of precedence is as follows. First, if the EN pin is LOW, then the PLL will be powered down. Provided
this is not the case, the PLL will be powered up if theATPU[1:0] word says to do so, regardless of the state of the RF_PD bit.After
the EN pin and the ATPU[1:0] word are considered, then the RF_PD bit then takes control of the power down function for the RF
PLL.
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2471 WAF | 制造商:Texas Instruments 功能描述: |
| LMX2471SLEX | 功能描述:IC PLL LP 3.6GHZ/1.7GHZ 24-CSP RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數:1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LMX2471SLEX/NOPB | 制造商:Texas Instruments 功能描述:PLL Dual 250MHz to 3600MHz 24-Pin LAM CSP T/R |
| LMX2485 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800MHz Integer PLL |
| LMX2485_0610 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL |
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