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參數(shù)資料
| 型號(hào)： | LMX2485E |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 3000 MHz, PQCC24 |
| 封裝： | 4 X 4 MM, 0.8 MM, PLASTIC, LLP-24 |
| 文件頁數(shù)： | 29/37頁 |
| 文件大?。?/td> | 861K |
| 代理商： | LMX2485E |
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Programming Description
(Continued)
2.4 R3 REGISTER
REGISTER
23
22
21
20
19
18
17
16
15
DATA[19:0]
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
C3
0
C2
1
C1
1
C0
1
R3
ACCESS[3:0]
RF_CPG[3:0]
IF_R[11:0]
2.4.1 IF_R[11:0] -- IF R Divider Value
For the IF R divider, the R value is determined by the IF_R[11:0] bits in the R3 register. The minimum value for IF_R is 3.
R Value
3
...
4095
IF_R[11:0]
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
0
.
1
1
.
1
1
.
1
2.4.2 RF_CPG -- RF PLL Charge Pump Gain
This is used to control the magnitude of the RF PLL charge pump in steady state operation.
RF_CPG
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Charge Pump State
1X
2X
3X
4X
5X
6X
7X
8X
9X
10X
11X
12X
13X
14X
15X
16X
Typical RF Charge Pump Current at 3 Volts (μA)
95
190
285
380
475
570
665
760
855
950
1045
1140
1235
1330
1425
1520
2.4.3 ACCESS -- Register Access word
It is mandatory that the first 5 registers R0-R4 be programmed. The programming of registers R5-R7 is optional. The
ACCESS[3:0] bits determine which additional registers need to be programmed. Any one of these registers can be individually
programmed. According to the table below, when the state of a register is in default mode, all the bits in that register are forced
to a default state and it is not necessary to program this register. When the register is programmable, it needs to be programmed
through the MICROWIRE. Using this register access technique, the programming required is reduced up to 37%.
ACCESS Bit
ACCESS[0]
ACCESS[1]
ACCESS[2]
ACCESS[3]
Register Location
R3[20]
R3[21]
R3[22]
R3[23]
Register Controlled
Must be set to 1
R5
R6
R7
The default conditions the registers is shown below:
Register
23
22
21
20
19
18
17
16
15
Data[19:0]
R4 Must be programmed manually.
0
0
0
0
0
0
0
0
0
0
0
0
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
C3
C2
C1
C0
R4
R5
R6
R7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
1
1
1
0
1
1
1
1
L
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LMX2485E EVAL | 功能描述:BOARD EVALUATION LMX2485E RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| LMX2485E EVAL/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 |
| LMX2485EEVAL | 功能描述:時(shí)鐘和定時(shí)器開發(fā)工具 LMX2485E EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評(píng)估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| LMX2485EEVAL/NOPB | 功能描述:時(shí)鐘和定時(shí)器開發(fā)工具 LMX2485E EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評(píng)估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| LMX2485ESQ | 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 PLLatinum? Frequency Synthesizers with 800 MHz Integer PLL |
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