参数资料
型号: YF80528KC017512
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 1400 MHz, MICROPROCESSOR, CPGA603
封装: MICRO, PGA-603
文件页数: 26/116页
文件大小: 2277K
代理商: YF80528KC017512
Intel XeonTM Processor MP
Datasheet
17
2.4.1
Phase Lock Loop (PLL) Power and Filter
V
CCA and VCCIOPLL are power sources required by the PLL clock generators on the processor
silicon. Since these PLLs are analog in nature, they require quiet 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 VCC. A typical filter topology is shown in Figure 1.
The AC low-pass requirements, with input at VCC and output measured across the capacitor (CA or
C
IO in Figure 1), is as follows:
< 0.2 dB gain in pass band
< 0.5 dB attenuation in pass band < 1 Hz (see DC drop in next set of requirements)
>34 dB attenuationfrom 1 MHzto66MHz
> 28 dB attenuation from 66 MHz to core frequency
The filter requirements are illustrated in Figure 2. For recommendations on implementing the filter
refer to the appropriate platform design guidelines.
Figure 1. Typical VCCIOPLL,VCCA and VSSA Power Distribution
VCC
R
VCCA
VSSA
VCCIOPLL
R
L
Processor
Core
PLL
CA
CIO
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