Next to test is another popular module from unknown manufacturer based on PCM5102A chip. It has a bit strange power schematics compared to datasheet, but nevertheless it is one of my favourites in terms of usage in projects
Data format: I2S, stereo output
Ouput: medium-impedance, capable to drive headphones
Price: ~€4 per unit
Here is the setup. Test circuit is a module itself, since it has built in output filter. It is identical to my setup, apart of R=470 Ohm, C=2n2, giving same 30KHz cutoff frequency
Again, I only have toy oscilloscope, therefore results will be eye measured:)
Test signal is mono wav file generated by esp8266 module using ESP8266Audio library, industry standard 44.1Khz sampling rate.
1KHz before filter, after filter
2KHz before filter, after filter
10KHz before filter, after filter
20KHz before filter, after filter
What can be said here. It has relatively clear output even before filter applied. After filter i see no issues even on 20Khz. Curve is clean and properly leveled for every measured frequency.
To compliment more, I listen one of these modules every day in my home audio setup and I perfectly happy with it. Given it's price, no more to ask really.