I would like to create a 8th order bandpass filter (fcenter=400Hz) using the demo board DC104B which includes LTC1068 IC. The datasheet is not clear about how to calculate the filter. Formulas for the resistors are presented but not the resource of the Q values and fo values.
The examples of the datasheet are based on the SW filterCad but I would like to do the maths by myself. Where are the fo and Q values coming from in the example below?
I have seen App note 27A explaining the design of a filter using LTC1064 but I can not apply the same logic to the LTC1068.
On the other hand, is possible to have the LTC1064 ltspice model?
Any help will be appreciated.