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| 型号： | MC145152DW2R2 |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC PAR-IN PLL FREQ SYNTH 28-SOIC |
| 标准包装： | 1,000 |
| 类型： | PLL 时钟/频率合成器 |
| PLL： | 是 |
| 输入： | 时钟 |
| 输出： | CMOS |
| 电路数： | 1 |
| 比率 - 输入:输出： | 1:1 |
| 差分 - 输入:输出： | 无/无 |
| 频率 - 最大： | 25MHz |
| 除法器/乘法器： | 是/无 |
| 电源电压： | 3 V ~ 9 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 28-SOIC W |
| 包装： | 带卷 (TR) |
| 其它名称： | MC145152DW2TR |
MC145151-2 and MC145152-2 Technical Data, Rev. 5
20
Freescale Semiconductor
Design Considerations
For VDD = 5.0 V, the crystal should be specified for a loading capacitance, CL, which does not exceed
32 pF for frequencies to approximately 8.0 MHz, 20 pF for frequencies in the area of 8.0 to 15 MHz, and
10 pF for higher frequencies. These are guidelines that provide a reasonable compromise between IC
capacitance, drive capability, swamping variations in stray and IC input/output capacitance, and realistic
CL values. The shunt load capacitance, CL, presented across the crystal can be estimated to be:
where
C1 and C2= external capacitors (see Figure 13)
Figure 14. Parasitic Capacitances of the Amplifier
Figure 15. Equivalent Crystal Networks
The oscillator can be “trimmed” on-frequency by making a portion or all of C1 variable. The crystal and
associated components must be located as close as possible to the OSCin and OSCout pins to minimize
distortion, stray capacitance, stray inductance, and startup stabilization time. In some cases, stray
capacitance should be added to the value for Cin and Cout.
Power is dissipated in the effective series resistance of the crystal, Re, in Figure 15. The drive level
specified by the crystal manufacturer is the maximum stress that a crystal can withstand without damage
or excessive shift in frequency. R1 in Figure 13 limits the drive level. The use of R1 may not be necessary
in some cases (i.e., R1 = 0
).
CL =
CinCout
Cin + Cout
+ Ca + Co +
C1C2
C1+C2
Cin
Cout
Ca
NOTE: Values are supplied by crystal manufacturer
(parallel resonant crystal).
2
1
2
1
2
1
RS
LS
CS
Re
Xe
CO
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相关代理商/技术参数 |
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| MC145155P | 制造商:Motorola Inc 功能描述: |
| MC145158-2 | 制造商:Motorola Inc 功能描述: |
| MC145158DW2 | 功能描述:IC SER-IN PLL FREQ SYNTH 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:* |
| MC145158DW2R2 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| MC145159FN1R2 | 制造商:Motorola Inc 功能描述: |
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