I am designing now a IR detector and I need to evalutate a Si photodiode (http://www.thorlabs.com/thorProduct.cfm?partNumber=PDA100A ), thus I am looking for a A/D USB interface. Does somebody think that Analog could have such complete A/D USB board for it, otherwise where I could find it ? Thanks for help. Vincent
I've moved your question to the Precision ADC space - they'll be able to assist you shortly.
The 16-bit AD7985 was used together with a flexible sensor signal conditioning block which can be used for accurate smallsignal measurements in this reference circuit. The AD7985 has an input voltage range of 0-Vref (Vref can be externally supplied up to 5V) which matches the output voltage of your detector. Other options - either different throughput rates, higher resolution, or input range up to +/-Vref - are listed on the common variations section of the circuit note.
Let me know if this helps.