Hi,
I was going through the datasheet of the LMH6518 and i could not find what the max input swing is when the pre-amp is set to 10dB and when it is set to 30dB gain.
Let's assume that we have a 0.92Vpp, the preamp is set to 10dB and attenuation ladder to -20dB.
We should then have 0.92V * 3.16V/V (10dB preamp) * 0.1V/V (-20dB ladder attenuator) * 2.77V/V (Fixed gain output opamp 8.86dB) = 0.81Vpp
No let's assume that we have set the pre-amp to 30dB gain and attenuation ladder to -20dB.
We should then have 0.92V * 31.6V/V (30dB preamp) * 0.1V/V (-20dB ladder attenuator) * 2.77V/V (Fixed gain output opamp 8.86dB) = 8.1Vpp
I know that 0.92V * 31.6V/V is just not possible, so is the max input swing (when preamp gain is set to 30dB) 10 times less? like 92mVpp?
Just looking for a confirmation.
Thanks in advance
Manos Tsachalidis
