參數(shù)資料
型號(hào)： LMX2485ESQ
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(yè)數(shù)： 36/37頁(yè)
文件大?。?/td> 861K
代理商： LMX2485ESQ
Programming Description
(Continued)
2.8 R7 REGISTER
REGISTER 23 22 21 20 19 18 17 16 15 14
13
12 11 10 9 8
Data[19:0]
1
7
6
5
4
3
2
1
0
C3 C2 C1 C0
1
1
R7
0
0
0
0
0
0
0
0
0
0 DIV4 0
0 0 0 IF_RST RF_RST IF_CPT RF_CPT
1
1
2.8.1 DIV4 -- RF Digital Lock Detect Divide By 4
Because the digital lock detect function is based on a phase error, it becomes more difficult to detect a locked condition for larger
comparison frequencies. When this bit is enabled, it subdivides the RF PLL comparison frequency (it does not apply to the IF
comparison frequency) presented to the digital lock detect circuitry by 4. This enables this circuitry to work at higher comparison
frequencies. It is recommended that this bit be enabled whenever the comparison frequency exceeds 20 MHz and RF digital lock
detect is being used.
2.8.2 IF_RST -- IF PLL Counter Reset
When this bit is enabled, the IF PLL N and R counters are reset, and the charge pump is put in a Tri-State condition. This feature
should be disabled for normal operation. Note that a counter reset is applied whenever the chip is powered up via software or CE
pin.
IF_RST
0 (Default)
1
IF PLL N and R Counters
Normal Operation
Counter Reset
IF PLL Charge Pump
Normal Operation
Tri-State
2.8.3 RF_RST -- RF PLL Counter Reset
When this bit is enabled, the RF PLL N and R counters are reset and the charge pump is put in a Tri-State condition. This feature
should be disabled for normal operation. This feature should be disabled for normal operation. Note that a counter reset is applied
whenever the chip is powered up via software or CE pin.
RF_RST
0 (Default)
1
RF PLL N and R Counters
Normal Operation
Counter Reset
RF PLL Charge Pump
Normal Operation
Tri-State
2.8.4 RF_TRI -- RF Charge Pump Tri-State
When this bit is enabled, the RF PLL charge pump is put in a Tri-State condition, but the counters are not reset. This feature is
typically disabled for normal operation.
RF_TRI
0 (Default)
1
RF PLL N and R Counters
Normal Operation
Normal Operation
RF PLL Charge Pump
Normal Operation
Tri-State
2.8.5 IF_TRI -- IF Charge Pump Tri-State
When this bit is enabled, the IF PLL charge pump is put in a Tri-State condition, but the counters are not reset. This feature is
typically disabled for normal operation.
IF_TRI
0 (Default)
1
IF PLL N and R Counters
Normal Operation
Normal Operation
IF PLL Charge Pump
Normal Operation
Tri-State
L
www.national.com
36
相關(guān)PDF資料
PDF描述
LMX2485ESQX 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
LMX2485SQ 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
LMX2485SQX 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
LMX2487 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL
LMX2487SQ 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2485ESQ/NOPB 功能描述:鎖相環(huán) - PLL DELTA-SIGMA DUAL PLL FOR RF PERSONAL COMM 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
LMX2485ESQX 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Dual 50MHz to 3000MHz 24-Pin LLP EP T/R
LMX2485ESQX/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
LMX2485EVAL 功能描述:時(shí)鐘和定時(shí)器開發(fā)工具 LMX2485 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
LMX2485QSQ/NOPB 制造商:Texas Instruments 功能描述:IC FREQ SYNTH 3GHZ 24-LLP 制造商:Texas Instruments 功能描述:CLOCK GENERATION/OTHER IC
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*