I am using ADL5382 demod eva board.I have given RF of 1200MHz at 0dBm and LO of 1200.1MHz at 8dBm.The I and Q data output is measuring Vp-p of 80mV in the scope.If i feed 1201MHz as LO, output at I and Q is 189mV.If LO is 1200.01MHz , output at I and Q is 33mV.Please clarify why there is a difference in the level.
I need output of +10dBm I and Q from 10kHz to 100KHz with 50ohms finally. So i have planned to use video amplifier at the output of ADL5382.
Kindly clarify whether i can achieve this level or not?
The ADL5382 is capable of driving loads as low as 200 ohms. You will need a buffer or balun if you wish to drive 50 ohm load. Please reference page 15 of the datasheet for more details.
Whether ADL5382 I and Q output works for lower frequency , around 1kHz to 2MHz?
In the data sheet I and Q frequency range is not mentioned and the graph also shows from 10MHz.
I did use ADL5382 in n zero_IF receiver architecture and my baseband signal frequency is of several hundreds KHz. My understanding is that ADL5382 IF output frequency could down to DC.
The balun that is used on the evaluation board will not operate below 2MHz; and thus the device was characterized for typical applications above this frequency. However, the device will operate in your desired frequency range. You should bypass the balun to achieve operation. Be sure to keep the differential load impedance above 200 ohms.