(1) in PCM2900C's Datasheet, the resistor from VBUS (pin 3) to the USB V+ is spec'd in the reference schematic for both the "High Performance" and the "not so High Performance" versions of the schematic as 2.2Ω. In the PCM2900C's "User's Guide" [sbau195.pdf], however, only the "High Performance" schematic (with a REG103GA-A regulator) is shown, and "R004" is spec'd as 0Ω. Does it matter enough to worry?
(2) Also, the decoupling caps from pin 10 to ground and pin 14 to ground differ between the two versions (10uF in the Datasheet; 1uF in the User's Guide). The Datasheet just says to use a decoupling cap; I assume either is fine? If a 1uF ceramic chip will also work just as well for the pin 10 and pin 14 caps, it'd take up less space than a 10uF tantalum.
(3) Should I disregard the lonely 0.0018uF cap in the User's Guide floating down near the bottom left corner? [You have to zoom WAAAY in to see the value.]
Thanks!
...R
