参数资料
型号: BX805555060P
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 64-BIT, MICROPROCESSOR, BGA771
封装: LGA-771
文件页数: 15/104页
文件大小: 3690K
代理商: BX805555060P
Electrical Specifications
18
Dual-Core Intel Xeon Processor 5000 Series Datasheet
2.4.2
Phase Lock Loop (PLL) and Filter
VCCA and VCCIOPLL are power sources required by the PLL clock generators on the Dual-
Core Intel Xeon Processor 5000 series. Since these PLLs are analog in nature, 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 (that is, maximum
frequency). To prevent this degradation, these supplies must be low pass filtered from
VTT.
The AC low-pass requirements 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. For recommendations on
implementing the filter, refer to the appropriate platform design guidelines.
Notes:
1.
Diagram not to scale.
2.
No specifications for frequencies beyond fcore (core frequency).
3.
fpeak, if existent, should be less than 0.05 MHz.
4.
fcore represents the maximum core frequency supported by the platform.
Figure 2-1. Phase Lock Loop (PLL) Filter Requirements
CS00141
0 dB
-28 dB
-34 dB
0.2 dB
forbidden
zone
-0.5 dB
forbidden
zone
1 MHz
66 MHz
fcore
fpeak
1 Hz
DC
passband
high frequency
band
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