I want to use the AD8310 with a DC-coupled input. I am using the setup from the datasheet in Figure 38 (page 19) reproduced here:
However, I have an extremely poor dynamic range. The dynamic range of this circuit is advertised through Figure 39 (page 19) of the datasheet, which is reproduced below:
I am not getting this dynamic range no matter what I adjust the potentiometer to. The lower end of the range is limited at an input of about -30 dBm.
Any ideas how I could troubleshoot this?
If it helps, if I use the basic AC-coupled configuration (show below), I DO indeed achieve the advertised dynamic range.
Thank you for your time!