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IC for switching V high-to-low, independent control of each, fast settle

atomphysics
Prodigy 20 points

I have been searching for several weeks for an IC that does the following:

  1. switches a voltage between a VHI  and VLO
  2. provides independent control over the values of VHI  and VLO (as in, by adjusting the power supply fed to the rails of the IC)
  3. after switching, settles to 0.1% in <500 ns
  4. synced to external TTL trigger pulse (freq/rep-rate = 100 Hz, duty-cycle = 1%)
  5. ( VHI = 8V, must be able to scan VLO between 0V and 5V. )

For (1)  and (4), anything that puts out a square pulse would do:  FET driver, IGBT, function generator, etc.

For (3), I've noticed that DAC IC's tend to have great settle times.

But that's not enough!  I have yet to find an IC that satisfies (2).  Every IC I've found so far puts out a pulse that is either ground-referenced (VLO = 0V) or floating.  I need to be able to independently change the high-level and low-level of the pulse.

I've tried a MOSFET, which satisfies (2), but does not settle quickly enough.  The requirements above seem pretty basic, so I imagine there must be an IC designed for this sort of thing, but I can't find one.

NOTE:  I'm not trying to drive a resistive load.  The application is to switch the voltage (with respect to ground) on a small piece of metal very quickly and precisely.