I have a question about the function of HMC601 Log Detector.
Actually, I am verifying the function of the detector by checking the following:
1) In detector mode, the Vset pin is connected to the Vlogout pin where the obtained voltage values (0.6 to 2 V) for different Input signal levels (-75 to +5 dBm) are accurate and look like the values in the datasheet.
2) In controller mode, the Vset receives a voltage of 0.9V through a voltage divider. But for different input signals ranging from -75 to 5 dBm, Vlogout ranges from 4.8 to 4.9 V only.
Are the results in controller mode accurate? Since I expected a value for Vlogout equal to that applied to Vset pin.
Thanks for your valuable answer.
Hi Bassil, please pardon the delayed response to your question.
In controller mode as you describe with VSET= 0.9V, we would expect to see LOGOUT slew from rail to rail as the input amplitude goes above or below about -50dBm (exact amplitude depends on frequency and individual IC). Make sure your controller mode connections are correct. Note 5 on last page of datasheet gives detailed instructions. You might need to verify with a voltmeter that the voltage on VSET pin is indeed 0.9V as it should be for this test case.