PCM6340-Q1: clipping to loud sound

Shinji Tsuji

Genius 14169 points

Part Number: PCM6340-Q1

Hi team,

If the loud sound accidentally input to the Mic which exceed the input full scale,

does the ADC clips the output or the output data collapse or inverted?

regards,

over 4 years ago

0 Zak Kaye over 4 years ago

TI__Mastermind 23050 points

Hi Shinji.

If the input range is exceeded then the input PGA will saturate and drive full scale value into the ADC so you will see severe clipping and distortion in the data output.

If you power your mic input with the integrated MICBIAS and bias your input pins appropriately, then it should not be possible to exceed the input range of the device, though you could still saturate the PGA/ADC with too much gain.

Best,

Zak

0 Shinji Tsuji over 4 years ago in reply to Zak Kaye

TI__Genius 14169 points

Hi Zak,

Clipping is OK, and I would like to know how this ADC output data sampled at that severe clipping condition.

Will it be like the center of the picture below or will it be like the right picture(signal inverted)?

regards,

0 Shinji Tsuji over 4 years ago in reply to Shinji Tsuji

TI__Genius 14169 points

0 Zak Kaye over 4 years ago in reply to Shinji Tsuji

TI__Mastermind 23050 points

Hi Shinji,

I know we handled this offline but just wanted to close this thread as well and clarify that no phase inversion should occur when the device saturates so the first image is the correct interpretation.

Best,

Zak

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PCM6340-Q1: clipping to loud sound