The ADA4932-1 simulation and hardware show an ~1.6uS settling time with a 7mV signal on a 1.4V signal. It is on both sides of the differential signal. The input is being driven by a 20mA square wave differential input from an AD9744 DAC. The signals are in the 100MHz range so there is nothing at that low a frequency. This is seen on both the LTSPICE simulation and the hardware.