LM49120 dynamic range

Hi, Paul,

You can calculate the voltage swing based on the plots in the data sheet under different conditions.

Usually in audio circuits, we do not worry about rail-to-rail inputs, so figure the inputs should be kept at  leave 0.5V away from the rails as a good rule of thumb.

-d2

Hi Don,

Thanks.  I should explain my application a little more.  It's not really an audio application.  I'm really only using this for the PGA function because it offers fine enough steps for my application (almost everything I have found come in binary or scope gains, or are optimized for RF...and draw a lot of power).  I'll only be needing to apply between -6/+3dB, but need as many steps between as I can get (I'd prefer a little finer than 1.5dB...but it will do).  As such, I could potentially be running near the rails at some point in the signal chain (although never closer than 0.5V to the rails on the input, so I should be good there).  I won't be driving a low impedance load (this will be placed between a ~10kHz sine source and a fixed gain coil driver with high input impedance), so I think my only concern will be where the output driver clips (or if there is anything internal that limits headroom).  Can I assume 0.5V for the output as well...even when driving a high impedance? 

Paul