Hello.
I’m looking for ADC driver for ADC12D1600 input. This ADC has differential input scale from 0.6 to 1 V and common mode voltage +1.25 V.
Gain of OpAmp should be between 2 and 4. Frequency band should be from DC to 1 GHz (-3 dB).
I’m going to choose between LMH6554, THS4509. Only one thing I don't understand:
Input common mode voltage for LMH6554 is ± 1.25 V. ADC output common mode voltage +1.25V.
So in Figure:
we see that for common mode voltage more than +1 V signal distortions of OpAmp are very high. The same thing is for THS4509:
Am I right to bother of this or not?
PS Of course signal distortion more than -20 dBc is not acceptable for me.