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PCM1821: word length 16bit

Part Number: PCM1821
Other Parts Discussed in Thread: LMX2571, TLV320ADC3120, , TLV320ADC3100

Hi expert,

My customer is using TLV320ADC3120 with LMX2571 I2S FSK mode.

TLV320ADC3120 can adjust the word length  to 16bit. Also LMX2571 input is 16bit.

However, they are considering replacement from  TLV320ADC3120 to PCM1821, due to WW IC supply reason.

PCM1821 is fixed 32bit  word length.

Do you have any method for using PCM1821 instead of TLV320ADC3120?



  • Hi Muk,

    I think that there is not way to change the word length on PCM1821. 

    I am not very familiar with the LMX2571, but from my understanding of the I2S bus, I believe that you could use 32 bit data, and the I2S input on the LMX2571 will truncate the data to 16 bit (16 LSB will be dont-care) - you should verify this by posting in the appropriate e2e for LMX2571

    Have you considered TLV320ADC3100?  this device is in the same family as ADC3120, and supports 16 bit data. however max sample rate is 96 kHz.