Differential Signal to Single Ended Signal Conversion

Im facing a problem here. I need an ADC that reads 0-20mA. The signal comes from a signal conditioner that creates a differential signal. However, a NI device with single ended inputs is much cheaper than differential inputs.
The signal conditioner already exists and I cant change that.
Im looking for something that can convert the differential signal to a single-ended signal.
I tried finding an IC that does that, but couldnt find one. Do they exist?
Maybe its easier for voltage than for current.
How is this usually done?
Best regards,

Use a current sensing resistor and then use a current shunt amplifier.  The amplifier will amplify the voltage drop across the reistor.  From there, you can just read the output voltage with a DAQ.  Create a DAQmx scale to do the math to convert that voltage into a current reading.
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    Message Edited by devchander on 03-08-2006 10:30 PM
    mode.vi ‏23 KB

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