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参数资料
| 型号： | MK2049-34SAILF |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 77.76 MHz, OTHER CLOCK GENERATOR, PDSO20 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, SOIC-20 |
| 文件页数： | 5/8页 |
| 文件大小： | 148K |
| 代理商： | MK2049-34SAILF |
3.3 Volt Communications Clock VCXO PLL
MDS 2049-34A B
5
Revision 060105
Integrated Circuit Systems, Inc.
525 Race Street, San Jose, CA 95126
tel (408) 297-1201
www.icst.com
MK2049-34A
PC Board Layout
A proper board layout is critical to the successful use of the MK2049-34A. In particular, the CAP1 and CAP2 pins
are very sensitive to noise and leakage (CAP2 at pin 18 is the most sensitive). Traces must be as short as possible
and the two capacitors and resistor must be mounted next to the device as shown below. The capacitor shown
between pins 15 and 17, and the one between pins 4 and 7 are the power supply decoupling capacitors. The high
frequency output clocks on pins 8 and 9 should have a series termination of 33
connected close to the pin.
Additional improvements will come from keeping all components on the same side of the board, minimizing vias
through other signal layers, and routing other signals away from the MK2049. You may also refer to application note
MAN05 for additional suggestions on layout of the crystal selection.
The crystal traces should include pads for small capacitors from X1 and X2 to ground. These are used to adjust the
stray capacitance of the board to match the crystal load capacitance. The typical telecom reference frequency is
accurate to much less than 1 ppm, so the MK2049-34A may lock and run properly even if the board capacitance is
not adjusted with these fixed capacitors. However, ICS recommends that the adjustment capacitors be included to
minimize the effects of variation in individual crystals, temperature, and aging. The value of these capacitors
(typically 0 - 4 pF) is determined once for a given board layout, using the procedure found in application note
16
1
15
2
14
3
13
4
12
5
11
6
7
8
9
10
20
19
18
17
G
cap
resist
cap
ca
p
ca
p
resist
V
G
cap
Optional -
see text
Cutout in ground and power plane.
Route all traces away from this area.
V
= connect to VDD
G
= connect to GND
Figure 2. Typical MK2049-34 Layout
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MK2049-34SAILFTR | 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 |
| MK2049-34SAITR | 功能描述:IC VCXO PLL CLK SYNTH 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:* |
| MK2049-34SI | 制造商:ICS 制造商全称:ICS 功能描述:3.3 V Communications Clock PLL |
| MK2049-34SITR | 制造商:ICS 制造商全称:ICS 功能描述:3.3 V Communications Clock PLL |
| MK2049-35 | 制造商:ICS 制造商全称:ICS 功能描述:3.3 V Communications Clock PLL |
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