Breaking News
Design How-To

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
1 Comment
NO RATINGS
Page 1 / 3 Next >
More Related Links
View Comments: Threaded | Newest First | Oldest First
Dr. HD
User Rank
Rookie
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
NO RATINGS
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!).

Top Comments of the Week
August Cartoon Caption Winner!
August Cartoon Caption Winner!
"All the King's horses and all the KIng's men gave up on Humpty, so they handed the problem off to Engineering."
5 comments
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Times on Twitter
EE Times Twitter Feed
Radio
LATEST ARCHIVED BROADCAST
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for todays commercial processor giants such as Intel, ARM and Imagination Technologies.
Flash Poll