- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄39600 > MK2732-06GTR (INTEGRATED DEVICE TECHNOLOGY INC) 54 MHz, VIDEO CLOCK GENERATOR, PDSO16 PDF資料下載
參數(shù)資料
| 型號： | MK2732-06GTR |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時鐘產(chǎn)生/分配 |
| 英文描述： | 54 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
| 封裝： | 0.173 INCH, LEAD FREE, TSSOP-16 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 192K |
| 代理商： | MK2732-06GTR |
MK2732-06
LOW PHASE NOISE VCXO AND MULTIPLIER
VCXO AND SYNTHESIZER
IDT LOW PHASE NOISE VCXO AND MULTIPLIER
3
MK2732-06
REV H 051310
External Component Selection
The MK2732-06 requires a minimum number of external
components for proper operation.
Decoupling Capacitor
A decoupling capacitor of 0.01
F and 0.1 F must be
connected between VDD5 and GND on pins 2, 3 and 5, 6,
and VDDIO and GND on pins 11 and 13, as close to the
device as possible. For optimum device performance, the
decoupling capacitor should be mounted on the component
side of the PCB. Avoid the use of vias in the decoupling
circuit.
Series Termination Resistor
When the PCB trace between the clock outputs and the
loads are over 1 inch, series termination should be used. To
series terminate a 50
trace (a commonly used trace
impedance) place a 33
resistor in series with the clock line,
as close to the clock output pin as possible. The nominal
impedance of the clock output is 20
.
Quartz Crystal
The MK2732-06 VCXO function consists of the external
crystal and the integrated VCXO oscillator circuit. To assure
the best system performance (frequency pull range) and
reliability, a crystal device with the recommended
parameters (as described in application note MAN05) must
be used, and the layout guidelines discussed in the following
section must be followed.
The frequency of oscillation of a quartz crystal is determined
by its “cut” and by the load capacitors connected to it. The
MK2732-06 incorporates on-chip variable load capacitors
that “pull” (change) the frequency of the crystal. The crystal
specified for use with the MK2732-06 is designed to have
zero frequency error when the total of on-chip + stray
capacitance is 14 pF.
The external crystal must be connected as close to the chip
as possible and should be on the same side of the PCB as
theMK2732-06. There should be no vias between the
crystal pins and the X1 and X2 device pins. There should be
no signal traces underneath or close to the crystal.
Crystal Tuning Load Capacitors
The crystal traces should include pads for small fixed
capacitors, one between X1 and ground, and another
between X2 and ground. Stuffing of these capacitors on the
PCB is optional. The need for these capacitors is
determined at system prototype evaluation, and is
influenced by the particular crystal used (manufacture and
frequency) and by PCB layout. The typical required
capacitor value is 1 to 4 pF.
To determine the need for and value of the crystal
adjustment capacitors, you will need a PC board of your final
layout, a frequency counter capable of about 1 ppm
resolution and accuracy, two power supplies, and some
samples of the crystals which you plan to use in production,
along with measured initial accuracy for each crystal at the
specified crystal load capacitance, CL.
To determine the value of the crystal capacitors:
1. Connect VDD of the MK2732-06 to 3.3 V. Connect pin 3
of the MK2732-06 to the second power supply. Adjust the
voltage on pin 3 to 0V. Measure and record the frequency of
the CLK output.
2. Adjust the voltage on pin 3 to 3.3 V. Measure and record
the frequency of the same output.
To calculate the centering error:
Where:
ftarget = nominal crystal frequency
errorxtal =actual initial accuracy (in ppm) of the crystal being
measured
If the centering error is less than ±25 ppm, no adjustment is
needed. If the centering error is more than 25 ppm negative,
the PC board has excessive stray capacitance and a new
PCB layout should be considered to reduce stray
capacitance. (Alternately, the crystal may be re-specified to
a higher load capacitance. Contact IDT for details.) If the
centering error is more than 25 ppm positive, add identical
Error
10
6x
f3.0V ftet
arg
–
()
f0V ftet
arg
–
()
+
ftet
arg
------------------------------------------------------------------------------
errorxtal
–
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MK2743SLF | 66 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
| MK2743S | 66 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
| MK2743STRLF | 66 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
| MK2751-01STRLF | 66 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
| MK2751-01SLF | 66 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MK2741F | 制造商:Ohmite Mfg Co 功能描述: |
| MK2743S | 制造商:MicroClock 功能描述:66 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
| MK2745-21 | 制造商:ICS 制造商全稱:ICS 功能描述:DVD/MPEG Clock Source |
| MK2745-21S | 功能描述:IC CLK SOURCE DVD/MPEG 16-SOIC RoHS:否 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:- 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:* |
| MK2745-21SLF | 功能描述:時鐘合成器/抖動清除器 DVD/MPEG CLOCK SOURCE 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。