Data Sheet

Module：EWN-8258FAT1HA1
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Fig 14 HDIM and USB interference
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.3.2 The main chip interferes with DDR
Because the main chips operate at about 800MHz or DDR2 operate at 667MHz, 3x frequency of
800MHz and 4x frequency of 667MHz are near 2.4GHz band. It must to place BT modules and
antennas far away from the main chip and DDR. It is strongly recommended that the main chip be
isolated from the DDR by a shield. As shown in the figure below.
Fig 15 Main chip and DDR interference