Further thought one could add the internal DelSig to the de-mux input and
under software control (so you both measure and stim pins in 1 chip) :
1) Turn off current source and measure pin V
2) Turn on current source, drive a pin with it, and measure V
The DelSig is good to 20 bits, has onchip Vref good to +/- .1% if memory serves me.
This works if you are only driving one pin at a time. However one can use up to 4
onchip current source/sinks so one could partition other ways.
,
48 single ended channels again routed. But you can do this differential if needed..
Even use the SAR and DelSig, to allow for some channels single ended, other diff.
Simple config. If you do diff to all you of course cut number channels to 1/2.
If you need to drive AC to the pins then replace current source with the onchip WaveDAC, that
can supply any arbitrary waveform, like sine, tri, ramp, whatever, and mux that out to a pin.
Drive to pin can be AC V or AC current. Freq programmable (up to about 100 Khz). In fact I
think you could config to drive AC or DC to a pin for architecture needs/cal.....
Regards, Dana.