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參數(shù)資料
| 型號(hào)： | LMX2486 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 1.0 GHz - 4.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum TM Frequency Synthesizers with 3.0 GHz Integer PLL |
| 中文描述： | 1.0千兆赫- 4.5吉赫高性能Δ-Σ低功耗雙PLLatinum商標(biāo)頻率合成器與整數(shù)的3.0 GHz鎖相環(huán) |
| 文件頁數(shù)： | 24/37頁 |
| 文件大?。?/td> | 870K |
| 代理商： | LMX2486 |
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Programming Description
2.0 GENERAL PROGRAMMING INFORMATION
The 24-bit data registers are loaded through a MICROWIRE Interface. These data registers are used to program the R counter,
the N counter, and the internal mode control latches. The data format of a typical 24-bit data register is shown below. The control
bits CTL [3:0] decode the register address. On the rising edge of LE, data stored in the shift register is loaded into one of the
appropriate latches (selected by address bits). Data is shifted in MSB first. Note that it is best to program the N counter last, since
doing so initializes the digital lock detector and Fastlock circuitry. Note that initialize means it resets the counters, but it does NOT
program values into these registers. The exception is when 22-bit is not being used. In this case, it is not necessary to program
the R7 register.
MSB
LSB
DATA [21:0]
CTL [3:0]
23
4
3
2
1
0
2.0.1 Register Location Truth Table
The control bits CTL [3:0] decode the internal register address. The table below shows how the control bits are mapped to the
target control register.
C3
x
0
0
0
1
1
1
1
C2
x
0
1
1
0
0
1
1
C1
x
1
0
1
0
1
0
1
C0
0
1
1
1
1
1
1
1
DATA Location
R0
R1
R2
R3
R4
R5
R6
R7
2.0.2 Control Register Content Map
Because the LMX2486 registers are complicated, they are organized into two groups, basic and advanced. The first four registers
are basic registers that contain critical information necessary for the PLL to achieve lock. The last 5 registers are for features that
optimize spur, phase noise, and lock time performance. The next page shows these registers.
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2486EVAL | 功能描述:時(shí)鐘和定時(shí)器開發(fā)工具 LMX2486 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| LMX2486SQ | 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Dual 5MHz to 4500MHz 24-Pin LLP EP T/R |
| LMX2486SQ/NOPB | 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
| LMX2486SQX | 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Dual 5MHz to 4500MHz 24-Pin LLP EP T/R |
| LMX2486SQX/NOPB | 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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