The following is the circuit used. The potential divider on pin 11 is supposed to give the differential op amp the swing it needs.
I get nothing out of the circuit at all - I have tried disconnecting pin 3 from pin 4 to just look at the output from the charge pump, but to no avail.
I am also using a 6v supply so that with pin 11 at 3v, the incoming signal swings +2, -3 at the differential inputs.
I have bought another chip in case I had damaged the first.
It still doesn't work - suggestions please.