TLV320ADC5120: EVM work abnormal under large input

Will Wang47

Part Number: TLV320ADC5120

Hi team,

I'm testing TLV320ADC5120 EVM for my customer.

My input is 0.93Vrms 200Hz sin tone signal, I use single end AC coupled input. I use audacity record the input signal.

I expect to see the data about -1dB, however, it show only -22dB. When I increase the input signal, and I could it can only increase to ~-20dB, and then clip will happen.

I tried several board, all the the same output.

The attached is my config file and the record file. could you help check why this happen and how to fix it?

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/6/TLV320ADC5120-record-file.ppc3

Thanks and Best Regards,

Will

over 2 years ago

0 Ore Ogundana over 2 years ago

TI__Genius 10305 points

Hey Will,

Thanks for bringing this to our attention, I would look into this issue and get back to you.

Ore.

0 Will Wang47 over 2 years ago in reply to Ore Ogundana

TI__Expert 7670 points

Hi Ore,

I find the problem, because of the laptop driver set the record volume to -21dB, so this cause the record signal much lower.

After changing back to 0dB, it works normal now.

0 Jeff McPherson over 2 years ago in reply to Will Wang47

TI__Mastermind 45995 points

Hi Will,

Glad to hear that it's working. Can we close this thread, or is there any other issues we can assist with?

Thank you,
Jeff McPherson

0 Will Wang47 over 2 years ago in reply to Jeff McPherson

TI__Expert 7670 points

Sure, please close this.

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TLV320ADC5120: EVM work abnormal under large input