Intel740™ Graphics Accelerator Design Guide
3-27
3 Device AGP MotherBoard Design
DDC/I
2
CP-39
This page details the 3.3 volt/5 volt signal conversion as well as the DDC/I
2
C connections. To
perform the voltage translation, quick switches are used.
Voltage Regulator P-40
This page shows the circuitry to convert from 3.3 Volts to 2.7 Volts. The regulator used in the
reference design does not need any heatsink for the FET. As shown, the FET will be dissipating
slightly over 1 watt. If a different voltage regulator solution will be used, calculations will be
needed to determine the need for a heatsink. Core decoupling is shown at the bottom of the page
and should be placed close to the Intel740 graphics accelerator.
Revision History P-41
Changes made to the schematics are listed here underneath the revision where they first appeared
and by page number.
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