(2.03 - 0.814) 10 6 12.288
參數(shù)資料
型號(hào)： LMK04033BEVAL
廠商： National Semiconductor
文件頁(yè)數(shù)： 47/65頁(yè)
文件大小： 0K
描述： BOARD EVAL FOR LMK04033BISQ
標(biāo)準(zhǔn)包裝： 1
系列： PowerWise®
主要目的： 計(jì)時(shí)，時(shí)鐘調(diào)節(jié)器
嵌入式： 否
已用 IC / 零件： LMK04033
主要屬性： 122.88 MHz VCXO
次要屬性： 集成式 PLL 和 VCO
已供物品： 板，線纜，文檔
= 0.00164,
MHz
V
(2.03 - 0.814) 10
6
12.288 81.4 - (-81.4)
(
)
'V 10
6
FNOM ('ppm2 - 'ppm1)
KVCO =
= 0.00164
MHz
V
2.03 - 0.814
0.001 - (-0.001)
KVCO =
'F
'V
,
MHz
V
=
¨
§ 'F
2 - 'F1
VTUNE2 - VTUNE1
SNOSAZ8J – SEPTEMBER 2008 – REVISED SEPTEMBER 2011
The tuning curve achieved in the user's application may differ from the curve shown above due to differences in
PCB layout and component selection.
This data is measured on the bench with the crystal integrated with the LMK04000 family. Using a voltmeter to
monitor the VTUNE node for the crystal, the PLL1 reference clock input frequency is swept in frequency and the
resulting tuning voltage generated by PLL1 is measured at each frequency. At each value of the reference clock
frequency, the lock state of PLL1 should be monitored to ensure that the tuning voltage applied to the crystal is
valid.
The curve shows over the tuning voltage range of 0.17 VDC to 3.0 VDC, the frequency range is ± 163 ppm; or
equivalently, a crystal frequency range of ± 2000 Hz. The measured tuning voltage at the nominal crystal
frequency (12.288 MHz) is 1.4 V. Using the diode data sheet tuning characteristics, this voltage results in a
tuning capacitance of approximately 6.5 pF.
The tuning curve data can be used to calculate the gain of the oscillator (KVCO). The data used in the calculations
is taken from the most linear portion of the curve, a region centered on the crossover point at the nominal
frequency (12.288 MHz). For a well designed circuit, this is the most likely operating range. In this case, the
tuning range used for the calculations is ± 1000 Hz (± 0.001 MHz), or ± 81.4 ppm. The simplest method is to
calculate the ratio:
ΔF2 and ΔF1 are in units of MHz. Using data from the curve this becomes:
A second method uses the tuning data in units of ppm:
FNOM is the nominal frequency of the crystal and is in units of MHz. Using the data, this becomes:
In order to ensure startup of the oscillator circuit, the equivalent series resistance (ESR) of the selected crystal
should conform to the specifications listed in the table of Electrical Characteristics. It is also important to select a
crystal with adequate power dissipation capability, or drive level. If the drive level supplied by the oscillator
exceeds the maximum specified by the crystal manufacturer, the crystal will undergo excessive aging and
possibly become damaged. Drive level is directly proportional to resonant frequency, capacitive load seen by the
crystal, voltage and equivalent series resistance (ESR). For more complete coverage of crystal oscillator design,
see
Application
Note
AN-1939
at
or
Termination and use of Clock Output (Drivers)
When terminating clock drivers keep in mind these guidelines for optimum phase noise and jitter performance:
Transmission line theory should be followed for good impedance matching to prevent reflections.
Clock drivers should be presented with the proper loads. For example:
–
LVDS drivers are current drivers and require a closed current loop.
–
LVPECL drivers are open emitters and require a DC path to ground.
Receivers should be presented with a signal biased to their specified DC bias level (common mode voltage)
for proper operation. Some receivers have self-biasing inputs that automatically bias to the proper voltage
level. In this case, the signal should normally be AC coupled.
Copyright 2008–2011, Texas Instruments Incorporated
51
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMK04033BEVAL/NOPB 功能描述:時(shí)鐘和定時(shí)器開(kāi)發(fā)工具 LMK04033BISQ 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
LMK04033BISQ 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Low-Noise Clock Jitter Cleaner with Cascaded PLLs
LMK04033BISQ/NOPB 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
LMK04033BISQE 制造商:Texas Instruments 功能描述:Clock Conditioner 48-Pin LLP EP T/R 制造商:Texas Instruments 功能描述:PRECISION CLOCK CONDITIONER, 48LLP
LMK04033BISQE/NOPB 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
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