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ADAU1452 register setting for 96kHz fs DSP Core operation

SigmaDSP & SigmaStudio funk48 May 21, 2014 00:00 1 replies Original on forum ↗
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funk48 Question
May 21, 2014 00:00

Hi

There is thread that explain 96kHz serial port operation for the ADAU1452.

https://ez.analog.com/message/139867#139867

But I'd like to make sure the register setting include core.

If my MCLKI is 24.576MHz and fs is 96kHz, according to the table 22 in the data sheet,

Pre-divider is 8 and FB divider is 96, then system clock will be 294.912MHz.

I now think that CLK GEN 1 x1 output rate is still 48kHz if I use default clock gen1 setting (N=1, M=6).

If so, should I set register 0xF401 (Start pulse) as 0b00011 (x2 rate) for core rate setting and 0xF20x for double rate?

Or change M=3, then 0xF401 should be 0b00010 (x1) and also 0xF201 should be base rate(x1)?

Which is good for operation?

Audio Signal Processors

adau1452

core_clcok

SigmaDSP Audio Processors

sampling_rate

register_setting

SigmaDSP

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ADIApproved Reply
May 22, 2014 00:00

Hi funk48,

My suggestion is option 1, leave CLK GEN 1 set to the default 48kHz rate and change the start pulse setting for 2x that rate. I think it will work either way but the labeling in the software tools and datasheet are all for an assumed 48Khz base rate, I think it will avoid confusion to stick with that unless you have a specific need.

Best regards,

John