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參數(shù)資料
| 型號： | BXM80526B450256 |
| 廠商： | INTEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 64-BIT, 450 MHz, MICROPROCESSOR, CPGA495 |
| 封裝： | MICRO PGA-495 |
| 文件頁數(shù)： | 80/84頁 |
| 文件大小： | 450K |
| 代理商： | BXM80526B450256 |
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Mobile Pentium III Processor in BGA2 and Micro-PGA2 Packages Datasheet
Intel Corporation
73
Appendix A: PLL RLC Filter Specification
A.1
Introduction
All mobile Pentium II and mobile Pentium III processors have internal PLL clock generators,
which are analog in nature and require quiet power supplies for minimum jitter. Jitter is
detrimental to a system; it degrades external I/O timings as well as internal core timings (i.e.
maximum frequency). In mobile Pentium II processors, the power supply filter was specified as
an external LC network. This remains largely the same for the mobile Pentium III processor.
However, due to increased current flow, the value of the inductor has to be reduced, thereby
requiring new components. The general desired topology is shown in Figure 5. Excluded from the
external circuitry are parasitics associated with each component.
A.2
Filter Specification
The function of the filter is two fold. It protects the PLL from external noise through low-pass
attenuation. It also protects the PLL from internal noise through high-pass filtering. In general,
the low-pass description forms an adequate description for the filter.
The AC low-pass specification, with input at VCCT and output measured across the capacitor, 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 attenuation from 1 MHz to 66 MHz
28-dB attenuation from 66 MHz to core frequency
The filter specification (AC) is graphically shown in Figure 27.
Other requirements:
Use a shielded type inductor to minimize magnetic pickup
The filter should support a DC current of at least 30 mA
The DC voltage drop from VCCT to PLL1 should be less than 60 mV, which in practice
implies series resistance of less than 2
. This also means that the pass band (from DC to 1Hz)
attenuation below 0.5 dB is for VCCT = 1.1V and below 0.35 dB for VCCT = 1.5V.
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