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PCM1840: Power consumption in I2S mode (2 CH)

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Part Number: PCM1840

Hello TI Community,

for an upcoming project we would like to use the PCM1840 due to it's impressive DRE capabilities. It's a stereo application and we only need 2 ADC channels. I could not find any information in the data sheet, if the PCM1840 always powers up 4 ADC channels even if you use it in 2-channel I2S mode. Will the power consumption be half when using I2S mode?

Best Regards,
Ulrich

  • Hi Ulrich,

    Since our US application team on Thanksgiving holidays last week therefore i'm responding on behalf of them.

    When the 2-channel I2S mode is used then we only power-up channel-1 and channel-2 internally and that being get routed to I2S output. Therefore the power-consumption for 2-channel operation at 48kHz sample rate with DRE enable is expected as around 14mA from AVDD and without DRE enable it is expected to be around 12.5mA.

    Also note that TLV320ADC6140 is the S/W controlled device using the same core design as PCM1840 therefore you can refer the below application notes and you can consider that PCM1840 is the sub-set of this application note and can be referred for the supported common use-case conditions.

    TLV320ADCx140 Power Consumption Matrix Across Various Usage Scenario

    Regards,

    Uttam

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