Analog FPGAs: how fast?

What sorts of frequencies can currently-available analog FPGAs run at?
(Either pure analog, or mixed such as the Actel Fusion.)

For example, if I wanted a gated integrator with a sub-microsecond
gating windows, what product lines, if any, can handle that?

I know e.g. that the Fusion has a 600 ksample/s ADC with a multiplexer,
but I don't know the bandwidth of the amplifiers etc. in the analog
blocks.

Thanks.

-- 
David M. Palmer  dmpalmer@email.com (formerly @clark.net, @ematic.com)