Hi. We have a problem with the ad9832 not working on one board and working on the other. The control program of the chip is the same. There are small differences in the wiring of the chip, digital and analog circuits are separated. AGND and DGND are not combined at the same point. Under the chip is located DGND. The topic contains waveforms in the COMP, REFin, REF out, FS ADJUST, and Iout lines. We also control the signal level via RF in and at the beginning we supply 0 V, then it supplies a constant voltage. The radiation frequency is 400 kHz.
Waveforms of the operating board.
COMP+Iout
REFin+Iout
REFout+Iout
FSADJUST+Iout
Waveforms of the idle board
COMP+Iout
FSADJUST+Iout
REFout+Iout
REFin+Iout
The electrical diagram is shown below.
