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DAQCard 700/6024 current drive

I have a client that uses the DAQCard 700 in a product. He has now had to swap to the 6024 as the 700 is no longer available. Eveything is OK except that the digital current drive of the 6024 is much higher than the 700 which causes problems with the custom hardware he is using. The problem is that the 700 low current is -50uA but the 6024 requires -320uA and the high current on the 700 is 1uA and the 6024 is 10uA. The net result is that his high and low voltages on the 6024 are out of spec, i.e. >0.8 but <2.0. Given that he doesn't want to change his badly designed input stage what are our options, anyone got around this in the past?

Thanks Kevin
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