Hi Roy,
I noticed that you are indicating "differential output" specifications for the audio op amp. If so, based on all the requirements you have listed, the OPA1678 looks like it would be a best fit:
https://www.ti.com/lit/ds/symlink/opa1678.pdf…
Part Number: OPA1654 Other Parts Discussed in Thread: OPA1678 , OPA1679 Hi,
Would like to check if there is any other alternative of OPA1654 can be considered? Thanks
Vito
Part Number: MC33078 Other Parts Discussed in Thread: OPA1678
Hi,
I am planning to use MC33078 for my audio circuit. Can you please share any reference design for he same.
Also what is the input voltage requirement for this IC. Can I power it using…
Part Number: RC4558 Other Parts Discussed in Thread: OPA1678
Hello TI's experts: Now I use the op amp RC4558 of the car gauge to achieve 2 functions: 1. Convert the differential signal of the car speaker into a single-ended signal：
2. Filter the…
You are right Kai, I was going on to a faster part with tolerancing then a post RC which also works nicely with a 25deg phase margin hiding in there, which I consider acceptable - 30deg min would be better, but if you are over 20deg, I stop working on…
Hi Wally,
The RC4136 is a legacy op amp and the electrical performances of today's TI audio op amps easily exceed that of this older device. I suggest the OPA1678 for high performance, low noise audio applications where cost is a major consideration…
Hi Mark,
Absolute value circuits become less ideal as the input frequency is increased. That is because the gain of the op amp falls off with increased frequency, limited slew rate and capacitances in the circuit affect the levels of precision that…
Barry,
You could potentially use a composite and parallel solution with the OPA1678 and the BUF634. Have you seen this circuit in the OPA1678 datasheet?
https://www.ti.com/lit/ds/symlink/opa1678.pdf?ts=1660003649923&ref_url=https%253A%252F%252Fwww…
Most of these filter programs will cheerfully deliver math based solutions calling for elements that will introduce other issues (high R's can cause noise and phase margin issues) will Q's > than say about 6 will require RC precision you can't buy.
…
