r5684 - trunk/gta02-core/docs/ecn

[werner at docs.openmoko.org]

Author: werner
Date: 2009-10-08 01:27:42 +0200 (Thu, 08 Oct 2009)
New Revision: 5684

Modified:
   trunk/gta02-core/docs/ecn/ecn0038.txt
Log:
- 2+2 = 5, err, 39+18 = 47 :-) Explained why.



Modified: trunk/gta02-core/docs/ecn/ecn0038.txt
===================================================================
--- trunk/gta02-core/docs/ecn/ecn0038.txt	2009-10-07 19:46:37 UTC (rev 5683)
+++ trunk/gta02-core/docs/ecn/ecn0038.txt	2009-10-07 23:27:42 UTC (rev 5684)
@@ -5,8 +5,9 @@
 place the filter caps C4119-C4122 and C4128 on the codec side of the common 
 mode coke. So they act in combination with B4105 as a lowpass filter who 
 removes incoming RF on the audio lines. I also would combine R4119/20 and 
-R4121/22 (39 pF+18 pF) to one 56 pF capacitor (like the EMI filter in the
+R4121/22 (39 pF+18 pF) to one 47 pF capacitor (like the EMI filter in the
 earpiece path) so we can remove at least one unique component from the BOM.
+(56 pF would be closer to 39+18 pF, but 47 pF should be good enough.)
 
 To do:
 I do not see any particular reason why C4128 is 10 pF it's there since GTA01.