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PCM1860EVM: How to configure PCM1860 into mode 1?

Part Number: PCM1860EVM
Other Parts Discussed in Thread: PCM1860, PCM9211, PCM1864

HI,

I had been trying to configure and test using the PCM1860EVM into Mode 1 but did not get the expected output.

Below is what we observed after setting up :

 

Input 1kHz Analog signal

Mode 0: no issue

Mode 1:

1)      Use PurePath console, config to Mode 1

2)      Insert J10, Remove J11 and J8

3)      Solder MD0 and MD1 to High – measured LRCK = 96kHz => Optical output is rubbish

4)      Solder MD0 to High, MD1 to Low – measured LRCK = 48kHz => Optical output = 500.253Hz (iso 1Khz), THD=3.26%

 

Is there anyting incorrect in above step?

 

Thanks,

Christina

 

 

  • Hi Christina,

    PCM1860 is a HW Controlled device and we have few input pins that will dictate the mode the device is configured in...more specifically, we need to make sure we have following pins in specified state if you want the PCM1860 in MASTER mode -

    MD0-MD1 => 11 for device to be in MASTER mode (256*fs)

    MD4=>0 for I2S (PCM9211 is configured by default to accept I2S data to convert to AES3 format)

    You can configure the input by setting MD6, MD5 and MD2 and provide the analog input on the Vinx channel as needed.

    Finally, if you have AP, i would recommend using PSIA (Programmable Serial Interface Adapater) to analyse the BCK/LRCK/DOUT to make sure the ADC is configured right and outputting the data.

    I remember your email note and you had eluded to PCM1864 which is Software controlled device and am not sure if you are testing w PCM1864 or PCM1860.

    Please clarify...and also let me know what you see at the output of the ADC. Thanks.

    Best regards,
    Ravi

  • Hi Ravi,

    Sorry for the confusion, the customer is planning to use PCM1860 instead and we had been working on the PCM1860EVM.

    Regards,
    Christina