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Op amps in small-signal audio design - Part 4: Selecting the right op amp (JFET-input types reviewed)

8/24/2011 03:47 PM EDT
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Dr. HD
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re: Op amps in small-signal audio design - Part 4: Selecting the right op amp (JFET-input types reviewed)
Dr. HD   8/25/2011 11:30:26 AM
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There are some JFET-input op-amps that have been released since Doug wrote his book that are worth considering: The LME49880 is a dual op-amp with the usual JFET-input traits of negligible bias currents and low current noise. Voltage noise isn't too shabby at 7 nv/sqrt(Hz). The only drawback is a relatively high input offset voltage of 5 mV (typ), 10 mV (max). As one would expect for an LME49xxx part, it has exceptionally low distortion (0.00003 % into 600 ohms; yes, that's four zeros!) and isn't too expensive. The ADA4627-1 (unity-gain stable) and ADA4637-1 (decompensated), as the part numbers suggest, are decent alternatives to the OPA627/637 with very similar performance but at half the price (still very expensive!).

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