TODAY I encouter a problem。my schematic is as follows。now the value of C20 and C24 is 0.1uf. and the resistor R218 and R216 is not populated.my platform is MCIMX6Q5EYM10AD。 I have two single end input AUDIO2_IN and AUDIO1_IN ,which connected to outer interface ,when i test i connect a line jack to AUDIO2_IN and AUDIO1_IN and gnd, and connected another jack to LINEOUT_L and LINEOUT_R and gnd.then the program make a loop between audio2_in and lineout , i play a music into the audio_1in and audio2_in,while i hear the music through a Jack connected to lineout。I find there SO MUCH noise ,what was wrong ,can somebody help me ?very worried
first,igorpadykov,thank you for answer my question!Now i come across another new question,when i using iphone play a music through a line to audio1-in,then i save it as a .wav file through secureCRT by uart,after i play it on pc , finally i find there is much noise in the .wav file ,but when i directly listen this music through hpout jack ,the music is very good!why?I have no idea.can you give me some advise?than you very much?
Hi zhang
please connect input AUDIO2_IN to ground and check if noise
persists on corresponding LINEOUT. If noise disappears, then noise
is from input cable, one can use shorter and better shielded cable.
If not, problem may in tlv320 - its power supplies noise and routing.
Best regards
igor
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