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參數(shù)資料
| 型號(hào)： | MK2705S |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 時(shí)鐘產(chǎn)生/分配 |
| 英文描述： | 24.576 MHz, VIDEO CLOCK GENERATOR, PDSO8 |
| 封裝： | 0.150 INCH, SOIC-8 |
| 文件頁(yè)數(shù)： | 3/7頁(yè) |
| 文件大?。?/td> | 175K |
| 代理商： | MK2705S |
MK2705
AUDIO CLOCK SOURCE
CLOCK SYNTHESIZER
IDT / ICS AUDIO CLOCK SOURCE
3
MK2705
REV C 102103
Application Information
Series Termination Resistor
Clock output traces should use series termination. To series
terminate a 50
trace (a commonly used trace impedance),
place a 33
resistor in series with the clock line and as close
to the clock output pin as possible. The nominal impedance
of the clock output is 20
.
Decoupling Capacitors
As with any high-performance mixed-signal IC, the MK2705
must be isolated from system power supply noise to perform
optimally.
Decoupling capacitors of 0.01F must be connected
between each VDD and the PCB ground plane. To further
guard against interfering system supply noise, the MK2705
should use one common connection to the PCB power
plane as shown in the diagram on the next page. The ferrite
bead and bulk capacitor help reduce lower frequency noise
in the supply that can lead to output clock phase modulation.
Recommended Power Supply Connection for
Optimal Device Performance
Crystal Load Capacitors
If a crystal is used, the device crystal connections should
include pads for capacitors from X1 to ground and from X2
to ground. These capacitors are used to adjust the stray
capacitance of the board to match the nominally required
crystal load capacitance. To reduce possible noise pickup,
use very short PCB traces (and no vias) been the crystal
and device.
The value of the load capacitors can be roughly determined
by the formula C = 2(CL - 6) where C is the load capacitor
connected to X1 and X2, and CL is the specified value of the
load capacitance for the crystal. A typical crystal CL is 18 pF,
so C = 2(18 - 6) = 24 pF. Because these capacitors adjust
the stray capacitance of the PCB, check the output
frequency using your final layout to see if the value of C
should be changed.
PCB Layout Recommendations
Observe the following guidelines for optimum device
performance and lowest output phase noise:
1) Each 0.01F decoupling capacitor should be mounted on
the component side of the board as close to the VDD pin as
possible. No vias should be used between decoupling
capacitor and VDD pin. The PCB trace to VDD pin should
be kept as short as possible, as should the PCB trace to the
ground via. Distance of the ferrite bead and bulk decoupling
from the device is less critical.
2) The external crystal should be mounted next to the device
with short traces. The X1 and X2 traces should not be
routed next to each other with minimum spaces, instead
they should be separated and away from other traces.
3) To minimize EMI and obtain the best signal integrity, the
33
series termination resistor should be placed close to
the clock output.
4) An optimum layout is one with all components on the
same side of the board, minimizing vias through other signal
layers (the ferrite bead and bulk decoupling capacitor can be
mounted on the back). Other signal traces should be routed
away from the MK2705. This includes signal traces just
underneath the device, or on layers adjacent to the ground
plane layer used by the device.
Connection to3.3V
Power Plane
Ferrite
Bead
Bulk DecouplingCapacitor
(such as 1 FTantalum)
VDDPin
0.01 FDecouplingCapacitors
BothVDDpinsmust beconnectedtothesamevoltage.
相關(guān)PDF資料 |
PDF描述 |
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| MK2727SLF | 27 MHz, OTHER CLOCK GENERATOR, PDSO8 |
| MK2732-06GLF | 54 MHz, VIDEO CLOCK GENERATOR, PDSO16 |
| MK2771-15RLF | 100 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO28 |
| MK2771-15RTR | 100 MHz, OTHER CLOCK GENERATOR, PDSO28 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MK2705SLF | 功能描述:時(shí)鐘發(fā)生器及支持產(chǎn)品 AUDIO CLOCK SOURCE RoHS:否 制造商:Silicon Labs 類型:Clock Generators 最大輸入頻率:14.318 MHz 最大輸出頻率:166 MHz 輸出端數(shù)量:16 占空比 - 最大:55 % 工作電源電壓:3.3 V 工作電源電流:1 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-56 |
| MK2705SLFTR | 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 AUDIO 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 |
| MK2705STR | 功能描述:IC AUDIO CLOCK SOURCE 8-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 專用 系列:- 標(biāo)準(zhǔn)包裝:1,500 系列:- 類型:時(shí)鐘緩沖器/驅(qū)動(dòng)器 PLL:是 主要目的:- 輸入:- 輸出:- 電路數(shù):- 比率 - 輸入:輸出:- 差分 - 輸入:輸出:- 頻率 - 最大:- 電源電壓:3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:28-SSOP 包裝:帶卷 (TR) 其它名稱:93786AFT |
| MK2712 | 制造商:ICS 制造商全稱:ICS 功能描述:NTSC/PAL Clock Source |
| MK2712S | 功能描述:IC CLK SOURCE MTSC/PAL 8-SOIC RoHS:否 類別:集成電路 (IC) >> 時(shí)鐘/計(jì)時(shí) - 時(shí)鐘發(fā)生器，PLL，頻率合成器 系列:- 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時(shí)鐘 輸出:時(shí)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(wú)/無(wú) 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:* |
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