參數(shù)資料
型號(hào)： 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)： 82/84頁
文件大?。?/td> 450K
代理商： BXM80526B450256
Mobile Pentium III Processor in BGA2 and Micro-PGA2 Packages Datasheet
Intel Corporation
75
Table 45. PLL Filter Capacitor Recommendations
Capacitor
Part Number
Value
Tolerance
ESL
ESR
C1
Kemet T495D336M016AS
33
F
20%
2.5 nH
0.225
C2
AVX TPSD336M020S0200
33
F
20%
unknown
0.2
NOTE:
There may be other vendors who might provide parts of equivalent characteristics and the OEMs should consider
doing their own testing for selecting their own vendors.
Table 46. PLL Filter Resistor Recommendations
Resistor
Part Number
Value
Tolerance
Power
R1
various
1
10%
1/16W
To satisfy damping requirements, total series resistance in the filter (from VCCT to the top plate of
the capacitor) must be at least 0.35
. This resistor can be in the form of a discrete component, or
routing, or both. For example, if the picked inductor has minimum DCR of 0.25
, then a routing
resistance of at least 0.10
is required. Be careful not to exceed the maximum resistance rule
(2
). For example, if using discrete R1, the maximum DCR of the L should be less than 2.0 - 1.1
= 0.9
, which precludes using L2 and possibly L1.
Other routing requirements:
The capacitor should be close to the PLL1 and PLL2 pins, with less than 0.1
per route
(These routes do not count towards the minimum damping resistance requirement).
The PLL2 route should be parallel and next to the PLL1 route (minimize loop area).
The inductor should be close to the capacitor; any routing resistance should be inserted
between VCCT and the inductor.
Any discrete resistor should be inserted between VCCT and the inductor.
A.4
Comments
A magnetically shielded inductor protects the circuit from picking up external flux noise.
This should provide better timing margins than with an unshielded inductor.
A discrete or routed resistor is required because the LC filter by nature has an under-damped
response, which can cause resonance at the LC pole. Noise amplification at this band,
although not in the PLL-sensitive spectrum, could cause a fatal headroom reduction for
analog circuitry. The resistor serves to dampen the response. Systems with tight space
constraints should consider a discrete resistor to provide the required damping resistance. Too
large of a damping resistance can cause a large IR drop, which means less analog headroom
and lower frequency.
Ceramic capacitors have very high self-resonance frequencies, but they are not available in
large capacitance values. A high self-resonant frequency coupled with low ESL/ESR is
crucial for sufficient rejection in the PLL and high frequency band. The recommended
tantalum capacitors have acceptably low ESR and ESL.
相關(guān)PDF資料
PDF描述
BXM80526B500256 64-BIT, 500 MHz, MICROPROCESSOR, CPGA495
BXM80526B600256 64-BIT, 600 MHz, MICROPROCESSOR, CPGA495
BY8400 Fast high-voltage soft-recovery rectifiers
BY8404 Fast high-voltage soft-recovery rectifiers
BY8406 Fast high-voltage soft-recovery rectifiers
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