You are right, but how do I make the summing circuit work now, do I have to add two more opamps or can it be reworked somehow?
Well, its kind of like you can stop here and learn a little more about opamp circuits. Or, you could just copy the recommended output stage design, or maybe copy another already known successful design. Otherwise its like you would just be copying maybe what I suggest, then play around with that.
Also, part of what matters with opamps in output stages is not only filter profiles. Opamps very in their ability to tolerate RF coming out of dacs, opamp performance also depends on layout, bypass, power supplies, etc. So just simulating a filter is only one step to think about.
If you want to learn about opamps and circuit design with opamps, then where you start depends on how much you know already. It can also depend on things like your math skills, but there are more and there are less theoretical ways to learn about opamps and circuits. Maybe what matters most would be your willingness to study and your perseverance to stick with it. So, what do you want to do?
Also, part of what matters with opamps in output stages is not only filter profiles. Opamps very in their ability to tolerate RF coming out of dacs, opamp performance also depends on layout, bypass, power supplies, etc. So just simulating a filter is only one step to think about.
If you want to learn about opamps and circuit design with opamps, then where you start depends on how much you know already. It can also depend on things like your math skills, but there are more and there are less theoretical ways to learn about opamps and circuits. Maybe what matters most would be your willingness to study and your perseverance to stick with it. So, what do you want to do?
Just want to make a dac with good sound for myself. Found that all caps have different sound and their combination also differs, now trying to minimize their quantity and thinking about coupling caps after dac chip
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May it be an RC high-pass filter with 100uF and 10K with fc = 0.159Hz ? Should I remove those resistors or no with shorted 100uF caps ?
Thank you ! All is work, getting 7V DC at output, maybe I need to reduce gain at op amps... Next question, can I put this outputs directly to differential power amplifier without dc blocking caps on it inputs? As I understand it's impossible... And another question about internal LDO, is there any benefits to make good external power supply to DVDD 1.8V ?
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That does not sound right. Without input DAC outputs should be at VCML (about half Vref) so typically at 2.5V DC.
IME no.
Getting the gain by these resistors (I've have not the same identical values but near this)
