TLV320ADC3140: When use the ADCx140 EVM to test the SNR of analog mic and digital mic, the result have big difference

Zhizhao Niu

Part Number: TLV320ADC3140

Tool/software:

Hi Team,

May customer are using the ADCx140EVM to test the analog mic and digital mic SNR performance. But the test result have big difference. Could you please help check which settings is wrong? Below is the connection and configuration. Thanks!

Analog mic can not normally record:

Digital mic can record normally:

Thanks!

B.R.

Lucas

14 days ago

0 Jeff McPherson 14 days ago

TI__Mastermind 36370 points

Hi Lucas,

Your snipping tool is covering the settings in the analog case. Can you show the settings used when recording analog mic?

There's also a preset option (in the top right of the screen) that might help.

Best regards,
Jeff McPherson

0 Zhizhao Niu 13 days ago in reply to Jeff McPherson

TI__Expert 3130 points

Hi Jeff,

Thanks for your help！Please help check the below snip shot for difference settings.

Thanks a lot!

B.R.

Lucas

0 Jeff McPherson 13 days ago in reply to Zhizhao Niu

TI__Mastermind 36370 points

Hi Lucas,

Does the analog mic work if you load the differential line input preset? It is okay to use line input setting for microphones.

Thanks,
Jeff McPherson

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TLV320ADC3140: When use the ADCx140 EVM to test the SNR of analog mic and digital mic, the result have big difference