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Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

AK4458 multichannel DAC with I2S input
AK4458 multichannel DAC with I2S input
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Old 10th April 2018, 10:27 AM   #131
Dimdim is online now Dimdim  Greece
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AK4458 multichannel DAC with I2S input
I haven't read the AK4458's datasheet in detail, but from a quick scan it looks like you'd need to start by using the PDN pin to do a reset on power-on and then use the I2C pins to connect to the Arduino. Beware that the I2C pins are expecting 3.3V levels, not 5V. So it would be a good idea to use either a 3.3V Arduino or voltage conversion devices.

Of course I'm assuming that you have set the chip up for I2C control.
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Old 10th April 2018, 01:58 PM   #132
zarandok is offline zarandok  Austria
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Thanks!
I bought a TX0108 isolator module, will try with it..
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Old 15th April 2018, 06:07 PM   #133
zarandok is offline zarandok  Austria
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Testing and first listening impressions...
I'm waiting for some filter caps yet.

(the "old" setup is only for testing!)
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Old 19th April 2018, 08:07 AM   #134
zarandok is offline zarandok  Austria
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Project preview: pre PSU for the DAC, with the same 10x10cm panel size, and 4 galvanic separated parts for DAC digital / analog, OPA + / -.
Reg ICs: TPS7A4501 or LT1963 or optional 3pin...
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Old 21st April 2018, 06:04 AM   #135
zarandok is offline zarandok  Austria
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Some listening with my LXmini system:
The sound seems to be a little raw and not so sophisicated, airy like my older PCM1794.
Ground noise level any dynamics are very good.
Perhaps the capacitors needs time to burning in, and/or I should try other digital filter setups (if I make the controller ready for use).

Last edited by zarandok; 21st April 2018 at 06:06 AM.
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Old 21st April 2018, 01:20 PM   #136
altor is offline altor  Israel
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Quote:
Originally Posted by zarandok View Post
Some listening with my LXmini system:
The sound seems to be a little raw and not so sophisicated, airy like my older PCM1794.
PCM1794 is better to compare with AK4490/93/95/97 and not with AK4458.

But in any case, AK4458 sound is rather good for 8ch chip.
Much better then AK4440 (I have both).
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Old 21st April 2018, 02:34 PM   #137
zarandok is offline zarandok  Austria
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So, you mean that you do not have an AK4458 vs PCM1794 experience, but the PCM1794 seems to be better than the stereo AK chips...?
You have a nice hompage with intresting projects!
Can I ask how do you make the DAC analog power supply?
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Old 21st April 2018, 02:46 PM   #138
altor is offline altor  Israel
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Quote:
Originally Posted by zarandok View Post
So, you mean that you do not have an AK4458 vs PCM1794 experience

No, because last time I made DAC with PCM/DSD-1792/94 more then 10 years ago, and do not have any one now.

Quote:
, but the PCM1794 seems to be better than the stereo AK chips...?
It depend which chips.
I think PCM1794 is comparable with AK449x (and AK is better to my mind).
But AK4458 is more simple then AK449x also then PCM1794.


Quote:
You have a nice homepage with interesting projects!
Can I ask how do you make the DAC analog power supply?
Thanks.
In AK4458 DAC I used LP2985 for AK and lm317/333 for OP in LPF.
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Old 22nd April 2018, 06:38 AM   #139
zarandok is offline zarandok  Austria
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Can I ask why exactly the LP2985? There are some types with much lower noise and small enough package (e.g. LT3042)...
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Old 22nd April 2018, 07:41 AM   #140
altor is offline altor  Israel
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Quote:
Originally Posted by zarandok View Post
Can I ask why exactly the LP2985? There are some types with much lower noise and small enough package (e.g. LT3042)...
Just because of a cost reduction of budget version.
LT3042/TPS7A4700/etc. I usually use in more expansive products.
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