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Understanding Op-Amp LPF in DAC | diyAudio
https://www.diyaudio.com/community/threads/understanding-op-amp-lpf-in-dac.354367/
Your DAC has a fourth order, active LPF in the 2 opamp section prior to the OP LC filter (which is most likely at a much higher freq). The first oder is wrapped around the the first I-V opamp. The second opamp, as Mark said, is a SK 3rd order LPF. The FET switch on first OPA is likely a de-emphasis filter enable.
Audio DAC output Low Pass Filter. - Page 1 - EEVblog
https://www.eevblog.com/forum/beginners/audio-dac-output-low-pass-filter/
Re: Audio DAC output Low Pass Filter. Have you tried a boost converter for the USB which will take in 3-5v, output 6v, then use a linear LDO at that output to give you a clean 5v or 3.3v. Also, there exist DC-DC converters which will give you +/-5v and isolated ones. However, the isolated ones get expensive and big.
Designing audio player - low-pass filter, DAC
https://electronics.stackexchange.com/questions/196296/designing-audio-player-low-pass-filter-dac
The digital input signal to the DAC is totally flat in the pass-band and then after the DAC and low pass filter (flat to Fs/2) there is a loss of signal level at the top end of the spectrum. This is natural for all zero-order-hold DACs (this includes the DAC8531).
Low-Pass Filter - Hack Audio
https://www.hackaudio.com/digital-signal-processing/basic-filter-effects/low-pass-filter/
A low-pass filter (LPF) is a basic type of spectral effect. It reduces the amplitude of high frequencies, but allows the low frequencies to pass through. Studying how a LPF works and how it is implemented provides a foundation for learning about all types of spectral effects. The simplest digital LPF uses 1 sample of delay.
Out-of-Band Noise and Filtering for PCM DAC
https://www.ti.com/lit/an/slea048/slea048.pdf
PCM DAC 2 nd-order Active LPF (EVM) PCM DAC CR passive LPF (1K, 2200pF) AP AP2722 (AES -17 LPF ON) V OUT V OUT V IN S/PDIF S/PDIF S/PDIF Audio Performance by CR Post LPF AES-17LPF in AP2722 is 20-kHzband limit filter, it have –60-dB attenuation at f = 24 kHz, any out-of-bandnoise can be removed ideally.
getting nosiy audio signal -PCM1789 DAC and LPF/AMP ...
https://forum.allaboutcircuits.com/threads/getting-nosiy-audio-signal-pcm1789-dac-and-lpf-amp-tpa6138.138935/
To explain the situation, the stages are MCU -> DAC (PCM1789) -> LPF/diff. to single circuit (TPA6138) -> audio amplifier (TPA6138). The LPF and amplifier are both made up of TPA6138. I don't think there is problem upto DAC output. I followed the datasheet of TPA6138 both for LPF/differential to single circuit and for audio amplifier.
USB audio DAC - Pavouk
http://pavouk.org/hw/usbdac/en_index.html
of DAC for filtering high frequencies above audioband which are produced by oversampling conversion. Integrated circuit includes digital LPF which filters frequency above 100kHz. In application notes for filter on the manufacturer pages are recommended 1st-Order LPF (simple RC) or I used simple RC LPF with recommended values R 1k and C 4n7.
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