We are using ADF5902 in our 2T4R radar, The radar work in timde division MIMO mode ,it means 2TX channel of ADF5902 should be alternately on/off between two consecutive chirp.
In out desin ,we using Continuous Triangular Ramp, time of positive ramp is 120us, time of negative ramp is 6us, and set ramp done signal to muxout pin to trig adc sample .
if we don't switch TX between two chirp, everythings goes smoothly, radar work well.
if we write R0 register to switch TX (during positive ramp or negative ramp), after write, MUXOUT don't output ramp done signal, it seems that ramp is stopped。
The question is
How to switch tx on/off between two consecutive chirps?
Test this, it worked for me. After write R0 (switching between tx antennas) write R5 register too, with RAMP ON bit enabled.
In fact, datasheet's initialization sequence also needs this extra R5 register (with RAMP ON enabled).
Kind Regards !!