Single supply configuration for LMH6505 VGA?

[gabhades]

Hi,

I'm designing an analog back-end which needs the TI LMH6505 chip working under a single-supply mode (+10V DC single supply). I have noticed the tips given in the data-sheet for this configuration and have settled all the DC offsets, the circuit schema is shown as below:



Everything works fine before LMH6505, but this chip just does not work. I can get some AC wave at its output, but the gain control voltage can not give any influence on the output voltage.

Has anyone had similar experience with this chip before?

Best,
gabhades

 

[keith1200rs]

You have 100 ohm load to ground but "ground" is really +5V in your single supply version. I am not sure if it is the cause of your problem, but is probably not your intention.

Keith