Have easy test circuit :
Problem in frequency response from +30dB t0 -30dB.
All filters from datasheet
Do you have idea why it is happen?
MCLK from stm32 i2s master clock - approx 12mHz
If your design includes the active DAC filter from the ADAU1701 Datasheet:
C8 as shown is way too large to achieve a cutoff frequency above the full audio range. Most likely it should be 470 pF.
Thx for answer
I check all parts in filter - 470pf+4k7 + 150pf +604 Ohm 1% + 3n3
its all 1206 smd - problem is something else
Oops, the datasheet error was fixed in its Revision C. Your measured curve shows a 6 dB/octave loss throughout the audio range. It's hard to imagine a possible cause.
I attached the exported TxBuffer contents. The project runs OK on the stock -1701 eval board.
Thank you for your help!
I found error - it was in 150pf capacitors in DAC filter.
Chinas "friend" sold 800nf instead 150pf - change to 150pf ceramic and everything fine now
One more thank to you!
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