Below configuration settings are done to enable PEQ in SGTL5000.
DAP_CONTROL->DAP_EN = 1
DAP_PEQ->EN = 0x01
DAP_AUDIO_EQ->EN = 0x01
write the co-efficient registers for low pass filter with cut-off frequency 800Hz, [based on the attached "SGTL5000 PEQ design_12Jun2013_v3" sheet (set Cutoff Frequency FC = 800 Hz, set Sampling Frequency Fs= 8000Hz)]
After doing the above configurations also we observe the frequency above 800Hz in the recorded file.
Note: we are observing the frequency components in the recorded file by using Equalizer application (in Linux PC)
Please correct us if we are missing some configuration.