TLV320AIC3106 example muddles channels and makes 6 dB attenuation

Vitalii Kukush

Other Parts Discussed in Thread: OMAP-L137, TMS320C6747, TLV320AIC3106

Dear E2E Community!

I'm trying to configure TLV320AIC3106 at OMAP-L137 EVM (I use it for debugging a software for TMS320C6747 DSP). I shall use an TI (Spectrum Digital) example "aic3106" as the template for my configuration program. But I can't understand why? :

1) at the stage "Audio Loopback from Linein [P10] --> to HP/Lineout [P12/P13]" (execution of the function aic3106_loop_linein( ) ) the device muddles left and right channels;

2) during working of the same loopback-program, device attenuates output signal relative to input (6 dB). PGA Gain is set to 0dB, Gain LINE1L to Left ADC and LINE1R to Right ADC are set to 0 dB also.

I shall be very appreciate for any advice! Vitalii PS: Example (test) project "aic3106" is part of the archive

http://support.spectrumdigital.com/boards/evmomapl137/revg/files/revg_EVMOMAPL137_BSL.zip

Unfortunately I can't understand, how to attach the archive with project to the message.

over 11 years ago

0 Vitalii Kukush over 11 years ago

Intellectual 830 points

I have solved the question about the 6 dB attenuation. It is attenuation of the input circuits of codec (R180 R181 C161 for the left ch, and R182 R183 C167 for the right ch, see please the technical reference on OMAP-L137 EVM, schematic on page A-23).

But the question with the muddling of channels is still open.

Thank You for help!

Vitalii

0 Sivaraj Kuppuraj over 11 years ago in reply to Vitalii Kukush

TI__Mastermind 35645 points

Hi Vitali,

As a moderator, i will move your post to Audio Converter forum, sothat, you would be better answered by experts there.

Thanks & regards,

Sivaraj K

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TLV320AIC3106 example muddles channels and makes 6 dB attenuation