參數(shù)資料
型號(hào)： LMX2485E
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 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)： 5/37頁(yè)
文件大?。?/td> 861K
代理商： LMX2485E
Electrical Characteristics
(V
CC
= 3.0V; -40C
≤
T
A
≤
+85C unless otherwise specified) (Continued)
Symbol
Parameter
Conditions
Value
Typ
Units
Min
Max
PHASE NOISE
L
F1Hz
RF
RF Synthesizer
Normalized Phase Noise
Contribution (Note 7)
RF_CPG = 0
RF_CPG = 1
RF_CPG = 3
RF_CPG = 7
RF_CPG = 15
-202
-202
-206
-208
-210
dBc/Hz
L
F1Hz
IF
IF Synthesizer
Normalized Phase Noise
Contribution
-209
dBc/Hz
DIGITAL INTERFACE (DATA, CLK, LE, ENOSC, CE, Ftest/LD, FLoutRF)
V
IH
High-Level Input Voltage
V
IL
Low-Level Input Voltage
I
IH
High-Level Input Current V
IH
= V
CC
I
IL
Low-Level Input Current
High-Level Output
Voltage
Low-Level Output
Voltage
MICROWIRE INTERFACE TIMING
Data to Clock Set Up
Time
t
CH
Data to Clock Hold Time See MICROWIRE Input Timing
t
CWH
Clock Pulse Width High
t
CWL
Clock Pulse Width Low
Clock to Load Enable
Set Up Time
Load Enable Pulse
Width
1.6
V
CC
0.4
1.0
1.0
V
V
μA
μA
-1.0
-1.0
V
IL
= 0 V
V
OH
I
OH
= -500 μA
V
CC
-0.4
V
V
OL
I
OL
= 500 μA
0.4
V
t
CS
See MICROWIRE Input Timing
25
ns
8
ns
ns
ns
See MICROWIRE Input Timing
See MICROWIRE Input Timing
25
25
t
ES
See MICROWIRE Input Timing
25
ns
t
EW
See MICROWIRE Input Timing
25
ns
Note 3:
A slew rate of at least 100 V/uS is recommended for frequencies below 500 MHz for optimal performance.
Note 4:
For Phase Detector Frequencies above 20 MHz, Cycle Slip Reduction (CSR) may be required. Legal divide ratios are also required.
Note 5:
Refer to table in Section
2.4.2 RF_CPG -- RF PLL Charge Pump Gain for complete listing of charge pump currents.
Note 6:
In order to measure the in-band spur, the fractional word is chosen such that when reduced to lowest terms, the fractional numerator is one. The spur offset
frequency is chosen to be the comparison frequency divided by the reduced fractional denominator. The loop bandwidth must be sufficiently wide to negate the
impact of the loop filter. Measurement conditions are: Spur Offset Frequency = 10 kHz, Loop Bandwidth = 100 kHz, Fraction = 1/2000, Comparison Frequency =
20 MHz, RF_CPG = 7, DITH = 0, and a 4th Order Modulator (FM = 0). These are relatively consistent over tuning range.
Note 7:
Normalized Phase Noise Contribution is defined as: L
(f) = L(f) – 20log(N) – 10log(f
) where L(f) is defined as the single side band phase noise
measured at an offset frequency, f, in a 1 Hz Bandwidth. The offset frequency, f, must be chosen sufficiently smaller than the PLL loop bandwidth, yet large enough
to avoid substantial phase noise contribution from the reference source. Measurement conditions are: Offset Frequency = 11 kHz, Loop Bandwidth = 100 kHz for
RF_CPG = 7, Fraction = 1/2000, Comparison Frequency = 20 MHz, FM = 0, DITH = 0.
MICROWIRE INPUT TIMING DIAGRAM
20087775
L
www.national.com
5
相關(guān)PDF資料
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2485E EVAL 功能描述:BOARD EVALUATION LMX2485E RoHS:否 類(lèi)別:編程器，開(kāi)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(lèi)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(kāi)發(fā)工具 LMX2485E EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類(lèi)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(kāi)發(fā)工具 LMX2485E EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類(lèi)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(chēng):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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