There are two filters at the back end of this chip. What are the parameters of each stage? How are the values of these resistors and capacitors calculated?
The design of an analog filter is dependent on your application requirements. You need to decide on the desired filter response requirements for your system to guide the decision on your choice of filter type. This is too involved to answer in an EngineerZone post, and I am not an expert at this anyway.
There is a lot of good information in the Linear Circuit Design Handbook on analog.com (www.analog.com/.../linear-circuit-design-handbook.html) .
In particular Chapter 8 discusses analog filters (https://www.analog.com/media/en/training-seminars/design-handbooks/Basic-Linear-Design/Chapter8.pdf)
There are also filter design software packages available commercially.