24 bit I2S with only 32x f_s SCLK?

capslock · 27th October 2007, 10:17 PM

I may be a bit thick as it is past midnight here, but I found the CS4398 datasheet says that 32x f_s SCLK is ok. Actually, I put my EMU 1212m in 192 kHz mode and measured SCLK, and it is only 6.1 MHz.

How can that work? Per f_s cycle, I need to transmit 2x24 bits, and each bit needs one SCLK cycle, i.e. I'd need 48x or 9.2 MHz...

capslock · 27th October 2007, 10:19 PM

As a matter of fact, the AK5394A on the same card needs at least 64x f_s SCLK according to the datasheet, and I just verified that: 6.1 MHz at 48 and 96k, but 12.3 MHz at 192k.

27th October 2007, 10:17 PM	#1
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	24 bit I2S with only 32x f_s SCLK? I may be a bit thick as it is past midnight here, but I found the CS4398 datasheet says that 32x f_s SCLK is ok. Actually, I put my EMU 1212m in 192 kHz mode and measured SCLK, and it is only 6.1 MHz. How can that work? Per f_s cycle, I need to transmit 2x24 bits, and each bit needs one SCLK cycle, i.e. I'd need 48x or 9.2 MHz...

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27th October 2007, 10:19 PM	#2
capslock diyAudio Member Join Date: Feb 2002 Location: Germany	As a matter of fact, the AK5394A on the same card needs at least 64x f_s SCLK according to the datasheet, and I just verified that: 6.1 MHz at 48 and 96k, but 12.3 MHz at 192k.

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