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PCM1840: IS2 - mode

Part Number: PCM1840

Hello dear TI engineers!

For our new application we plan to use the PCM1840 in hardware mode and I2S audio protocol. The PCM1840 is a 4channel ADC and the I2S protocol is defined for two channels only.  So I would expect two SDOUT pins for I2S-mode. One for channel 1/2 the other for channel 3/4. Wordclock and bitclock are for both of course.
According to datasheet the PCM1840 has one SDOUT only which is fine for 4channel TDM-mode. My questions for PCM1840 in I2S-mode : Does PCM1840 leave out maybe channel 3/4 and supports channel 1/2 only ? Or is there maybe a hidden GPIO which can be used as second SDOUT for channel 3/4?

Would be great if you could help us!

Thanks a lot and best regards


  • Hi Mario,

    Welcome to the forum and thanks for your interest in our devices! PCM1840 only supports 4-channel operation in TDM mode. There are no additional SDOUT lines for 4-channel I2S. If you can use TDM this would be the preferred path as you will need 2 devices for 4-channels of I2S.