TLV320ADC5140: frequency response at 96KHz

Sai Loo

Part Number: TLV320ADC5140

Hi team,

Do we have 96KHz sampling rate frequency response information for ADC5140? Our datasheet only show 48KHz sampling rate data

Regards,

SK Loo

over 4 years ago

0 Carson Allen over 4 years ago

TI__Genius 13610 points

Hello,

I am checking on this and will be back with you within 48 hours.

Best Regards,

Carson

Low Power Audio Apps

0 Carson Allen over 4 years ago in reply to Carson Allen

TI__Genius 13610 points

Were you looking more so for THD+N vs frequency or for amplitude vs frequency?

For THD+N it would be roughly same and for amplitude that is more so determined by the 20kHz low-pass filter than the sampling frequency.

0 Sai Loo over 4 years ago in reply to Carson Allen

TI__Expert 5080 points

Thanks Carson,

customer performed the audio precision captured with 48KHz and 96KHz sampling freq and see some differences.

What are the parameters that need to tune? (1st order IIR filter?) to move the -3dB cutoff frequency from ~ 25H to 12Hz?

Regards,

SK Loo

0 Carson Allen over 4 years ago in reply to Sai Loo

TI__Genius 13610 points

Hi,

I will take a deeper look into datasheet and respond back soon.

Best Regards,

Carson

0 Carson Allen over 4 years ago in reply to Carson Allen

TI__Genius 13610 points

Hi Again,

Please refer to page.33 of datasheet to see how to set HPF to programmable coefficient value.

In the case to make it 12Hz for 96kHz sample rate you can set N0 to equal 268435 which is 00041893 in Hex I believe.

Best Regards,

Carson

0 Sai Loo over 3 years ago in reply to Carson Allen

TI__Expert 5080 points

Hi Carson,

How to change the default sampling frequency of 48KHz in our EVM to 96KHz? could it be done with PPC3 and the 5140 library?

Regards

SKLoo

0 Carson Allen over 3 years ago in reply to Sai Loo

TI__Genius 13610 points

Hello SKLoo,

Do you mean default as when the device is reset it automatically goes back to 96kHz sample rate?

Best Regards,

Carson

Audio

Audio forum

TLV320ADC5140: frequency response at 96KHz