AM3352 - TUNER IC QUESTION

Phong Le

Can you please confirm and provide input on assumption being made below:

The McASP I2S needs to be frequency locked with the tuner sample frequency if we do not want to over or under sample, right? But the tuner IC I'v seen so far does not seem to have this master/slave clock relationship. Since each McASP port need to drive 4 tuners and all 4 tuners and the McASP port need to be frequency locked, right?

over 9 years ago

0 Yordan Kovachev over 9 years ago

TI__Guru**** 161600 points

Hi,

I've checked the related TRM sections:
22.3.3.1.1 TDM Format
22.3.3.1.2 Inter-Integrated Sound (I2S) Format
22.3.5 Clock and Frame Sync Generators
22.3.8.2 Time-Division Multiplexed (TDM) Transfer Mode
22.3.12.1.1 Clocks
22.3.12.2 Transmit/Receive Section Initialization
I couldn't find any recommendation that the McASP I2S needs to be frequency locked with the tuner sample frequency... Also the audio dac example: processors.wiki.ti.com/.../Sitara_Linux_Audio_DAC_Example does not mention such requirement.

Hope this helps.

Best Regards,
Yordan

0 Phong Le over 9 years ago in reply to Yordan Kovachev

TI__Prodigy 550 points

Yordan,

In the application note below it shows a need for frequency lock when AP is operating in master mode

http://www.ti.com/lit/an/slaa469/slaa469.pdf

Regards,

Phong

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AM3352 - TUNER IC QUESTION