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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
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Old 6th August 2020, 10:07 AM   #8871
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Yes, they share filters, just like most DACs do. I design the 44K filter first, it's the most important one, then the 48K filter will have its cutoff 9% higher...

You're free to design seperate filters, just observe the 256 Kbyte filter file size limit....
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Old 6th August 2020, 11:06 AM   #8872
TNT is offline TNT  Sweden
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Thanks Sören!

Is it my .skr file that need to be smaller than 256k? Or how do I calculate the size?

Will there be an indication if it is exceeded or does something fail badly?

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Old 6th August 2020, 11:23 AM   #8873
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
It's the size of the .skr file. There are no checks and I haven't tested it, but if larger it will overwrite the uC firmware in flash, which don't really matter that much as it's only really used when updating....
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Old 6th August 2020, 11:25 AM   #8874
TNT is offline TNT  Sweden
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Tnx.

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Old 7th August 2020, 12:32 PM   #8875
TNT is offline TNT  Sweden
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Quote:
Originally Posted by soekris View Post
Take a look of the source file, each time you double the samplerate rate you halve the number of taps, so 88/96K = 2K taps, 176/192 = 1K taps
FIR2?

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Old 7th August 2020, 12:37 PM   #8876
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
FIR2 is fixed at 240 taps, see source file.
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Old 13th August 2020, 03:49 PM   #8877
ghitus is offline ghitus  Italy
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Hi all, I'm slowly building a dam1021 dac and for now I'm working on the power supply. I just finished the Reflektor-D shunt reg that will feed the I2S isolated input at 3.3v. Or at least it should do it. The problem is that it outputs 3.2v instead of 3.3. Do you think it could be a real issue?
Many thanks,
Gaetano.
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Old 13th August 2020, 04:34 PM   #8878
soekris is offline soekris  Denmark
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Reference DAC Module - Discrete R-2R Sign Magnitude 24 bit 384 Khz
Quote:
Originally Posted by ghitus View Post
Hi all, I'm slowly building a dam1021 dac and for now I'm working on the power supply. I just finished the Reflektor-D shunt reg that will feed the I2S isolated input at 3.3v. Or at least it should do it. The problem is that it outputs 3.2v instead of 3.3. Do you think it could be a real issue?
Many thanks,
Gaetano.
No, it's still inside the +-5%....
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Old 13th August 2020, 05:58 PM   #8879
gavinb is offline gavinb  South Africa
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Quote:
Originally Posted by soekris View Post
In the first firmware rev, I only reserved 256 Kbyte in the 1 Mbyte Flash for filters, didn't matter then as the filters started out as 1K filters.

Now with larger filters you have to be careful what you do, a 4K filter is 16 Kbyte, and with seperate filters for all types and all samlerates, you can fill up those 256 Kbyte, and then there is also the DSD filters....

I'm also looking to move to 36 bit or 40 bit filters, so at some time I might reorganize things a little, there is no need to reserve 256Kbyte for the uC, although thery're are available with 256 Kbyte flash, I have never used larger than the 64 Kbyte version.

In next gen boards I will move up to 2 Mbyte flash, mostly to have space for a larger FPGA. But don't hold out for anything soon on the boards, first up is the dac2541, a successor to the dac1541....

Plus the larger the file, the longer time it takes to download....

@soekris
dac2541!

Hope you can share more details soon.
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Old 13th August 2020, 06:38 PM   #8880
TNT is offline TNT  Sweden
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Please Sören, two PLL modes - 1) Movie and 2) Music.

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