I cannot achieve a 2.1 Vrms mentioned in their datasheet (pages 4 and 9). I can only output 1.04Vrms from the 1kHz source. Do I measure it wrong or this is what I should expect? Or maybe I get such measurements because it could possibly be a counterfeit chip?
I tried to play different sine wave tone (0 dBFS) generated from Audiocheck and now I can see 1.88 Vrms and 5.64 Vpp when there is no load. Is this something I should expect? I'm playing this sound at the full volume over bluetooth since I use CSRA64215 chip as a source for PCM5102A. I also checked CSRA64215 config and it's output level is already set to max.