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AM6442: bulk capacitors on TMDS64EVM

Guru 10295 points

Part Number: AM6442
Other Parts Discussed in Thread: TMDS64EVM

Hi Support Team,

The following guideline states that the bulk capacitor on the processor side of the VDDS_DDR power rail
should be at least 22μF and at least one, but the DDR4 EVM schematic shows a combination of "10μF, 4.7μF".
Why is the combination of "10μF, 4.7μF" shown in TMDS64EVM (DDR4 EVM) schematic?
What is the background of this combination?

AM64x/AM243x DDR Board Design and Layout Guidelines
Table 1-2. Bulk Bypass Capacitors

It is posted on the following thread that a minimum of 22μF and at least one configuration is desirable according to the Guidelines.
What is the recommended combination?


e2e.ti.com/.../am6442-high-speed-bypass-capacitors-in-the-power -supply-line-for-ddr/5191094?

Best Regards,
Kanae