Audio analog to digital ADC for bench

[LuisMCP]

I have been searching an analog to digital ADC converter for testing DACs with no results for my askings.

The idea is to have an "bench" ADC and feed it with a wave generator (sine, square, triangle, arbitrary, etc.) for testing DACs with SPDIF or I2S or other formats (Right Justified, Left Justified, etc.)

It would be good idea as a bonus, to have DSD output too.

It no seems very difficult to design one with PCM4222, AKM or another chip, but i'm too lazy for begin the task.

Anybody know is there any ADC suitable or project?

 

[billshurv]

why not use software on a computer to generate your files for the DAC? Seems a lot easier?

 

[LuisMCP]

why not use software on a computer to generate your files for the DAC? Seems a lot easier?

Sorry, I forget to tell that I have not room at my table, and I don't want a computer.

 

[billshurv]

You have room for a sig-gen but not a raspberry PI? How on earth are you measuring these DACs?

 

[LuisMCP]

I have no idea about raspberry pi or Beagle Bone.
If it is easy or there is some project that were close to my needs I could to have a try.
Another red line is the price. I know that Altor Audio sells the JKG generator that is a very wonderful thing, but is costs 520 USD, and I want some cheap gear.

 

[billshurv]

what measurement equipment are you using?

 

[LuisMCP]

Tektronix TDS2002

 

[billshurv]

RPi with media player software will hide behind that scope nicely. Job done for SPDIF and I2S other than DSD and prices start at €4.

 

[LuisMCP]

it seems a daunting task research for someone who has no idea about raspberry or bbb.
I will try to find some easy and "plug and play" project on google...
Thanks

 

[billshurv]

Don't take this the wrong way, but if you can't setup a simple file player on a linux box then you might not be ready to test DACs in any sensible form. Note that it's only an 8-bit scope as well.

 

[LuisMCP]

I believe this works for me.
With only the first, I get SPDIF.
Cascading both, I get I2S.
Cheap, easy and without work! (Not in the wrong way, of course)


Analog to SPDIF

SPDIF to I2S