TIDUEZ9B July 2022 – April 2023
The OPAx422 is used for multiple purposes in this design. The most critical one is the filter stage, where it provides sufficient GBW and slew rate. The 4-channel device allows for a small layout. This device is also used for the gain stage and the 5-V to 3.3-V level translation. In these cases, the specifications are not too critical and the same device was selected to keep the BOM count low.