In most cases, including the evaluation board from ESS, OPA1612 is used to drive the inputs of the ES9822PRO. It is a tried and proven solution, working quite well.
In some cases, a fully differential amplifier gives a simpler design.
The QuantAsylum QA403 apparently use the OPA1632.
Has anyone here tried to use OPA1632, or perhaps the newer OPA1633 and compared the performance to the OPA1612 solution, in terms of noise and distortion, including distortion versus frequency? Noise can probably be simulated rather accurately, but distortion is more difficult to predict.
I am looking for objective performance, so no discussions on audibility please!
In some cases, a fully differential amplifier gives a simpler design.
The QuantAsylum QA403 apparently use the OPA1632.
Has anyone here tried to use OPA1632, or perhaps the newer OPA1633 and compared the performance to the OPA1612 solution, in terms of noise and distortion, including distortion versus frequency? Noise can probably be simulated rather accurately, but distortion is more difficult to predict.
I am looking for objective performance, so no discussions on audibility please!