[FAQ] AFE5809: To support SONAR applications, what are the modifications to be done in AFE5809 from the standard Ultrasound setup?

The LNA’s DC offset correction circuit consists of a HPF with a corner frequency set by CBYPASS that has to be changed to 1uF in order to prevent attenuation of the input signal for signals <100kHz.

http://e2e.ti.com/support/applications/medical/f/30/t/549672

http://www.ti.com/lit/ug/tidu702/tidu702.pdf