The 3650 is an optically coupled, differential input, isolationamplifier having programmable gain. Noise for the3650 is specified to 4mVrms (typ) on the input stage of theisolation barrier and 65mVrms (typ) on the output stage. Thegain of the 3650 is controlled using external resistors on theinput stage. In low gains, the noise performance of the 3650is dominated by the output stage noise figure. The noiseperformance in high gains is dominated by the input stagenoise. By using two OPA627s as a pre-amp to the 3650isolation amplifier, the noise performance of the isolationcircuit is greatly enhanced.
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