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!
What is the ad8310 driving? It sometimes has trouble driving sizable capacitive loads like a long coax cable and will oscillate.
From: Ahmad email@example.com
Sent: Monday, August 01, 2011 03:39 AM
To: Dobler, Joel
Subject: New message: "DC-Coupled AD8310"
Analog Devices EngineerZone<http://ez.analog.com/index.jspa>
reply from Ahmad<http://ez.analog.com/people/Ahmad> in RF Components - View the full discussion<http://ez.analog.com/message/29667#29667