TLV320adc3101: How to interprete the generated 32 bits data?

Vincent Ng27

Part Number: TLV320ADC3101

Hi,

I need to get data out from TLV320ADC3101 using I2S with 32bits word length. I am wondering how to interpret the 32 bits data generated by TLV320ADC3101. Since the ADC has 24 bits resolution, so, I thought the 24 bits data will be either aligned on the MSB or LSB but it turns out that there are data starting from the 27/28 bits to the LSB (eg. 00000100 00101110 10010001 00100111). I cannot find anything from the datasheet. Please help. Thanks.

over 8 years ago

0 Diego Melendez over 8 years ago

TI__Guru 57800 points

Hi, Vincent,

Welcome to E2E, Thanks for your interest in our products!.

When the TLV320ADC3101 is configured in 32-bit mode, '0' data will be added to the stream to complete the 32-bit data length.

Do you have any capture of the digital output of the device?.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Vincent Ng27 over 8 years ago in reply to Diego Melendez

Prodigy 30 points

Hi Diego,

Thank you for your reply. Attach is the captured data in hex format. It's a 2KHz sine wave with different amplitude. I increased the PGA gain to 30dB and now the whole 32bits has data.

Best Regards,
Vincent

signalb.txt

0 Diego Melendez over 8 years ago in reply to Vincent Ng27

TI__Guru 57800 points

Hi, Vincent,

It seems the TLV320ADC3101 is able to send 32-bits of valid data by making an internal data length conversion from the 24-bit ADC. You should be able to read the 32-bit data output of the device.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Vincent Ng27 over 8 years ago in reply to Diego Melendez

Prodigy 30 points

Thank you Diego.

Best Regards,
Vincent

Audio

Audio forum

TLV320adc3101: How to interprete the generated 32 bits data?