I've built a circuit to measure RF signals of 2.4GHz in accordance to Fig. 48 in the datasheet for singled ended drive. The only difference is that I have not put a capacitor on the CHPF pin and have connected it directly to GND. Everything else is as per the reference design for measurement mode (i.e. a combination of Fig 47 and 48).
During testing, I am measuring an output voltage of 5V no matter what I am applying to the input (this includes leaving it disconnected). The circuit draws a steady current approximately 25mA
Is there something obvious that I am missing here? I have already check for solder splash between VPOS and VOUT. The voltage on the INHI/INLO when the input is disconnected measures between 2.2V-2.5V, which i assume is also correct.
This is the second chip that I have bought and results have been the same for both, so I dont think that it is a faulty chip.
This is for a project at university and even my supervisor/other academics have tried a range of things and cant seem to figure it out. Any suggestions?
If CHPF not needed, leave the pin open, not shorted to ground.
Thanks for your reply, I'll make the changes and see if it alters rhe output
This worked for me, thanks for the advice!!