[gta02-core] Audio ECN update
werner at openmoko.org
Wed Sep 2 09:13:15 CEST 2009
Rene Harder wrote:
> This kind of EMI suppression filter is what i think we are looking for:
> TDK MEM2012P101R
And they even have them at Digi-Key :-) So that one would be good
for data and audio ?
They're a little bulk, though. Also, when I compare the attenuation
plots of the MEM2012 (pi) and the Murata NFL18ST (tee), then they
basically look the same.
We've been over EMI filters a lot in the Dash/HXD8 project, because
of the high demands on GPS, and we had to switch from one type to
the other (on UART lines) because of sourcing, apparently without
Back then, I didn't understand what the real difference between the
two was. Maybe now I found someone who can explain ? ;-) What is
there that the data sheet doesn't tell us ? You mention impedance,
but all the data sheets show is attenuation for 50 Ohm.
More information about the gta02-core