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参数资料
| 型号： | MK2049-45ASI |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 125 MHz, OTHER CLOCK GENERATOR, PDSO20 |
| 封装： | 0.300 INCH, SOIC-20 |
| 文件页数： | 6/10页 |
| 文件大小： | 229K |
| 代理商： | MK2049-45ASI |
MK2049-45A
3.3 VOLT COMMUNICATIONS CLOCK PLL
VCXO AND SYNTHESIZER
IDT 3.3 VOLT COMMUNICATIONS CLOCK PLL
5
MK2049-45A
REV C 051310
Charge Pump Current Table
Special considerations must be made in choosing loop
components CS and CP. These recommendations can be
found on our web site.
Series Termination Resistor
Clock output traces over one inch 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, as close to the clock output pin as possible.
The nominal impedance of the clock output is 20
. (The
optional series termination resistor is not shown in the
External Component Schematic.)
Decoupling Capacitors
As with any high performance mixed-signal IC, the
MK2049-45A 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
MK2049-45A 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
The device crystal connections should include pads for
small capacitors from X1 to ground and from X2 to ground,
shown as CL in the External Component Schematic. These
capacitors are used to adjust the stray capacitance of the
board to match the nominally required crystal load
capacitance. Because load capacitance can only be
increased in this trimming process, it is important to keep
stray capacitance to a minimum by using very short PCB
traces (and no vias) been the crystal and device.
Please refer to MAN05 for the procedure to determine
capacitor values.
PCB Layout Recommendations
For optimum device performance and lowest output phase
noise, the following guidelines should be observed. Please
also refer to the Recommended PCB Layout drawing on
Page 7.
1) Each 0.01 F decoupling capacitor should be mounted on
the component side of the board as close to the VDD pin as
possible. No via’s 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 loop filter components must also be placed close to
the CHGP and VIN pins. CP should be closest to the device.
Coupling of noise from other system signal traces should be
RSET
(k
)
Charge Pump Current
(ICP) (A)
13.02
139
15
125
16
119
18
109
20
100
22
93
24
86
27
68
36
56
47
43
56
35
75
28
100
22
150
15
200
12
Connection to 3.3V
Power Plane
Ferrite
Bead
Bulk Decoupling Capacitor
(such as 1 F Tantalum)
VDD Pin
0.01 F Decoupling Capacitors
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MK2049-45ASILF | 功能描述:时钟发生器及支持产品 3.3 VOLT COMMUNICA. CLOCK VCXO PLL RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MK2049-45ASILFTR | 功能描述:时钟发生器及支持产品 3.3 VOLT COMMUNICA. CLOCK VCXO PLL RoHS:否 制造商:Silicon Labs 类型:Clock Generators 最大输入频率:14.318 MHz 最大输出频率:166 MHz 输出端数量:16 占空比 - 最大:55 % 工作电源电压:3.3 V 工作电源电流:1 mA 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:QFN-56 |
| MK2049-45ASITR | 功能描述:IC CLK PLL COMM 3.3V 20-SOIC RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:39 系列:- 类型:* PLL:带旁路 输入:时钟 输出:时钟 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 频率 - 最大:170MHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| MK2049-45SI | 功能描述:IC CLK PLL COMM 3.3V 20-SOIC RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 时钟发生器，PLL，频率合成器 系列:- 标准包装:39 系列:- 类型:* PLL:带旁路 输入:时钟 输出:时钟 电路数:1 比率 - 输入:输出:1:10 差分 - 输入:输出:是/是 频率 - 最大:170MHz 除法器/乘法器:无/无 电源电压:2.375 V ~ 3.465 V 工作温度:0°C ~ 70°C 安装类型:* 封装/外壳:* 供应商设备封装:* 包装:* |
| MK2049-45SILF | 功能描述:时钟合成器/抖动清除器 3.3 VOLT COMMUNICA. CLOCK VCXO PLL RoHS:否 制造商:Skyworks Solutions, Inc. 输出端数量: 输出电平: 最大输出频率: 输入电平: 最大输入频率:6.1 GHz 电源电压-最大:3.3 V 电源电压-最小:2.7 V 封装 / 箱体:TSSOP-28 封装:Reel |
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