参数资料
型号: BX80547RE2933CN
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 2930 MHz, MICROPROCESSOR, PBGA775
封装: FLIP CHIP, LGA-775
文件页数: 11/94页
文件大小: 2796K
代理商: BX80547RE2933CN
Datasheet
19
Electrical Specifications
2.4.1
Phase Lock Loop (PLL) Power and Filter
VCCA and VCCIOPLL are power sources required by the PLL clock generators for the Celeron D
processor in the 775-land package. Since these PLLs are analog, they require low noise power
supplies for minimum jitter. Jitter is detrimental to the system: it degrades external I/O timings as
well as internal core timings (i.e., maximum frequency). To prevent this degradation, these supplies
must be low pass filtered from VTT.
The AC low-pass requirements, with input at VTT are as follows:
< 0.2 dB gain in pass band
< 0.5 dB attenuation in pass band < 1 Hz
> 34 dB attenuation from 1 MHz to 66 MHz
> 28 dB attenuation from 66 MHz to core frequency
The filter requirements are illustrated in Figure 2-1.
.
NOTES:
1. Diagram not to scale.
2. No specification exists for frequencies beyond fcore (core frequency).
3. fpeak, if existent, should be less than 0.05 MHz.
Figure 2-1. Phase Lock Loop (PLL) Filter Requirements
0 dB
–28 dB
–34 dB
0.2 dB
–0.5 dB
1 MHz
66 MHz
fcore
fpeak
1 Hz
DC
Passband
High
Frequency
Band
Filter_Spec
Forbidden
Zone
Forbidden
Zone
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