The herein schematic
is a complete full duplex 300 Baud modem filter as one of filter
implementation using the MF10 Versatile Monolithic Active Filter
Building Block Device.
You will find later some applications such as Basic Circuit Description, Block Diagram of the MF10, Programmable Dual Clock Generator, Butterworth low pass filter, MF10 as an Input Filter and Sample/Hold, Generating Quadrature Sine Waves, and the Non-Inverting Integrator Used in the MF10.
Find all you want to know about MF10 Full Duplex Modem Filter Diagram Schematic and Applications, here in pdf filetype.