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参数资料
| 型号： | MK3732-10SLFTR |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 162 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| 封装： | 0.150 INCH, SOIC-16 |
| 文件页数： | 4/7页 |
| 文件大小： | 105K |
| 代理商： | MK3732-10SLFTR |
VCXO AND MULTIPLIER
MDS 3732-10 B
4
Revision 120202
Int egrat ed C i rcuit Syste ms q 525 R a ce S t r eet, San Jose, CA 95126 q t e l (40 8 ) 295 -9800 q
w w w. icst . c om
MK3732-10
Recommended Crystal Parameters:
Initial Accuracy at 25
°C
±20 ppm
Temperature Stability
±30 ppm
Aging
±20 ppm
Load Capacitance
14 pf
Shunt Capacitance, C0
7 pF Max
C0/C1 Ratio
250 Max
Equivalent Series Resistance
35
Max
The external crystal must be connected as close to the
chip as possible and should be on the same side of the
PCB as the MK3732-10. There should be no via’s
between the crystal pins and the X1 and X2 device
pins. There should be no signal traces underneath or
close to the crystal. See application note MAN05.
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 to 3.3V. Connect pin 3 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 3.3V. 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 25ppm 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 ICS for details.) If the centering
error is more than 25ppm positive, add identical fixed
centering capacitors from each crystal pin to ground.
The value for each of these caps (in pF) is given by:
External Capacitor =
2 x (centering error)/(trim sensitivity)
Trim sensitivity is a parameter which can be supplied
by your crystal vendor. If you do not know the value,
assume it is 30 ppm/pF. After any changes, repeat the
measurement to verify that the remaining error is
acceptably low (typically less than ±25ppm).
Error
10
6
x
f
3.3 3.0
()V ftet
arg
–
()
f
0V
f
tet
arg
–
()
+
f
tet
arg
----------------------------------------------------------------------------------------
error
xtal
–
=
相关PDF资料 |
PDF描述 |
|---|---|
| MK3732-10SLF | 162 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| MK3732-10STR | 162 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| MK3732-10S | 162 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| MK3732-15GTRLF | 108 MHz, OTHER CLOCK GENERATOR, PDSO16 |
| MK3732-15GTR | 108 MHz, OTHER CLOCK GENERATOR, PDSO16 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MK3732-10STR | 功能描述:IC VCXO/MULTIPLIER 16-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:* |
| MK3732-17 | 制造商:ICS 制造商全称:ICS 功能描述:ADSL VCXO CLOCK SOURCE |
| MK3732-17S | 功能描述:时钟合成器/抖动清除器 ADSL VCXO CLOCK SOURCE 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 |
| MK3732-17SI | 制造商:ICS 制造商全称:ICS 功能描述:ADSL VCXO CLOCK SOURCE |
| MK3732-17SITR | 制造商:ICS 制造商全称:ICS 功能描述:ADSL VCXO CLOCK SOURCE |
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