BX80547PG3200FSL8Q6 Datasheet, PDF (19/105 Pages) Intel Corporation – Intel® Pentium® 4 Processor 6xxΔ Sequence and Intel® Pentium® 4 Processor Extreme Edition

Electrical Specifications
2.4.1 Phase Lock Loop (PLL) Power and Filter
V_CCA and V_CCIOPLL are power sources required by the PLL clock generators for the Pentium 4
processor. 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 V_TT.
The AC low-pass requirements, with input at V_TT 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. Contact your Intel representative for further
details and documentation.
.
Figure 2-1. Phase Lock Loop (PLL) Filter Requirements
0.2 dB
0 dB
–0.5 dB
–28 dB
Forbidden
Zone
–34 dB
Forbidden
Zone
DC
1 Hz
fpeak 1 MHz 66 MHz
fcore
Passband
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.
High
Frequency
Band
Datasheet
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