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參數(shù)資料
| 型號： | LMX2542LQ2121 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大?。?/td> | 253K |
| 代理商： | LMX2542LQ2121 |
2.0 Programming Description
(Continued)
2.2 R0 REGISTER
The R0 register contains the RF_FN, RF_A, RF_B, RF_LD, and SPI_DEF control words. The register address bits are R0[1:0]
= 00. The detailed descriptions and programming information for each control word is discussed in the following sections.
Reg
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
MSB
SHIFT REGISTER BIT LOCATION
LSB
DATA[21:0] FIELD
ADDRESS
[1:0]
FIELD
R0
SPI_
DEF
1
RF_
LD
0
RF_B
[3:0]
RF_A
[2:0]
RF_FN
[10:0]
0
0
2.2.1 RF_FN[10:0] - RF Synthesizer Fractional Numerator Counter (R0[2:12])
The RF_FN control word is used to setup the 11-bit
Σ
modulator. This corresponds to programming the fractional numerator
counter portion of the RF feedback divider. The value programmed is dependent on the reference oscillator used.
2.2.1.1 Programming RF_FN[10:0] Using 19.20 MHz Reference Oscillator
When a 19.20 MHz reference oscillator is used (OSC_FREQ bit = 0), the RF_FN can be programmed to values ranging from 0
to 1919.
Numerator
RF_FN[10:0]
f
OSCin
= 19.20 MHz
6
5
0
0
0
0
1
1
10
0
0
1
9
0
0
1
8
0
0
1
7
0
0
0
4
0
0
1
3
0
0
1
2
0
0
1
1
0
0
1
0
0
1
1
0
1
1919
2.2.1.2 Programming RF_FN[10:0] Using 19.68 MHz Reference Oscillator
Similarly, when a 19.68 MHz reference oscillator is used (OSC_FREQ bit = 1), the RF_FN can be programmed to values ranging
from 0 to 1967.
Numerator
RF_FN[10:0]
f
OSCin
= 19.68 MHz
6
5
0
0
0
0
0
1
10
0
0
1
9
0
0
1
8
0
0
1
7
0
0
1
4
0
0
0
3
0
0
1
2
0
0
1
1
0
0
1
0
0
1
1
0
1
1967
2.2.2 RF_A[2:0] - RF Synthesizer Swallow Counter (A Counter) (R0[13:15])
The RF_A control word is used to setup the RF synthesizer’s A counter. The A counter is a 3-bit swallow counter used in the
programmable feedback divider. The RF_A control word can be programmed to values ranging from 0 to 7.
Divide Ratio
RF_A[2:0]
RF Mode
1
0
0
1
2
0
0
1
0
0
1
1
0
1
7
L
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| LMX2542LQ2121/NOPB | 功能描述:IC FREQ SYNTH CELL/GPS 28-LLP RoHS:是 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:PLLatinum™ 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):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(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2542LQX2121 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Cellular and GPS Frequency Synthesizer System with Integrated VCO |
| LMX2571EVM | 功能描述:LMX2571 PLLatinum? Series Timing, Frequency Synthesizer Evaluation Board 制造商:texas instruments 系列:PLLatinum?? 零件狀態(tài):有效 主要用途:計時，頻率合成器 嵌入式:- 使用的 IC/零件:LMX2571 主要屬性:帶 VCO 的單路分數(shù)-N PLL 輔助屬性:SMA 連接器 所含物品:板 標準包裝:1 |
| LMX2571NJKT | 功能描述:IC FREQ SYNTHESIZER VCO 制造商:texas instruments 系列:PLLatinum?? 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:頻率合成器（RF） PLL:帶旁路 輸入:時鐘，晶體 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:2:2 差分 - 輸入:輸出:是/無 頻率 - 最大值:1.4GHz 分頻器/倍頻器:是/是 電壓 - 電源:3.15 V ~ 3.45 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:36-WFQFN 裸露焊盤 供應(yīng)商器件封裝:36-WQFN（6x6） 標準包裝:1 |
| LMX2572RHAT | 功能描述:HIGH PERFORMANCE RF SYNTHESIZER 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 類型:頻率合成器（RF） PLL:帶旁路 輸入:時鐘 輸出:- 電路數(shù):1 比率 - 輸入:輸出:1:2 差分 - 輸入:輸出:是/是 頻率 - 最大值:6.4GHz 分頻器/倍頻器:是/是 電壓 - 電源:3 V ~ 3.5 V 工作溫度:-40°C ~ 85°C（TA） 安裝類型:表面貼裝 封裝/外殼:40-VFQFN 裸露焊盤 供應(yīng)商器件封裝:40-VQFN（6x6） 標準包裝:1 |
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