PCM1864: PCM1864

Eric Cui13

Part Number: PCM1864
Other Parts Discussed in Thread: PCM1865

hi,

    1, the problem description:
             The PCM1864 is configured as a 24-bit output I2S. The oscilloscope has only 16 valid bits for the actual output. The test waveforms are as follows. (LRCK: 16KHz; BCK: 1024KHz)
             Waveforms are LRCK, Data, BCK in sequence;

2, configuration information

Thank you.

over 7 years ago

0 Diego Melendez over 7 years ago

TI__Guru 57800 points

Hi, Eric,

This same question was attended last week, this is an expected behavior for the PCM1864 as this device has a target SNR performance of -103dB. if 24-bits of data are required, please take a look to the PCM1865, which is similar to the PCM1864 but has a SNR performance of -110dB.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Eric Cui13 over 7 years ago in reply to Diego Melendez

Intellectual 920 points

hi,

Why doesn't PCM1864 support 24-bit I2S?

Regards,
Eric

0 Diego Melendez over 7 years ago in reply to Eric Cui13

TI__Guru 57800 points

Hi, Eric

It is because the effective number of data bits to get to the noise floor if 103dB is 17 (which are the ones seen in the PCM1864 when configured in 24-bit mode).

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

0 Eric Cui13 over 7 years ago in reply to Diego Melendez

Intellectual 920 points

hi,
Thank you for your support.

Which method is used to quantize the ADC in PCM1864? SAR ADC or sigma-delta ADC?

Regards,
Eric

0 Diego Melendez over 7 years ago in reply to Eric Cui13

TI__Guru 57800 points

Hi, Eric,

The PCM1864 has a Delta-sigma ADC.

Best Regards,

-Diego Meléndez López
Audio Applications Engineer

Audio

Audio forum

PCM1864: PCM1864