I used ADAU1466 + SIGMASTUDIO 4.2 to create PINK NOISE GENERATOR as shown in the image below.

However, it operates slightly differently from PINK NOISE output from other devices. In the image below, green is the PINK noise output by general equipment, and blue is the PINK noise output of ADAU1466. In the band higher than 1KHz, the GAIN is high.

Even if I tried to adjust INPUT and OUTPUT, only the overall GAIN was different and could not be made the same. If this method is correct, I would like to know how to output the same as other equipment.

Or I would like to know if there is any other way to make PINK NOISE GENRATOR.