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Old 14th May 2004, 12:13 PM   #1
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Default Low voltage noise dual OP

I am looking for a good dual OP with low voltage noise on low source impedances, so preferably with BJT inputs.
Yes, I am of course familiar with NE5532, but I am looking for something superior.

Any suggestions?
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Old 14th May 2004, 12:21 PM   #2
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What are your application and how low noise do want to get?

Are AD8620, OPA2134 too noisy?
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Old 14th May 2004, 01:01 PM   #3
Werner is offline Werner  Europe
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OPA2227 and 2228. 3nV/sqrt(Hz).

Also available in quad.

http://focus.ti.com/lit/ds/symlink/opa227.pdf
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Old 14th May 2004, 01:10 PM   #4
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Great, that's the stuff I've been looking for. Thank you Werner!
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Old 14th May 2004, 01:11 PM   #5
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JRC2114 4nV/sqrt(Hz)

Marantz and Accuphase use this.
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Old 14th May 2004, 01:52 PM   #6
Electrons are yellow and more is better!
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Quote:
Originally posted by Werner
OPA2227 and 2228. 3nV/sqrt(Hz).

Also available in quad.

http://focus.ti.com/lit/ds/symlink/opa227.pdf
If low noise is of major concern those opamps are definitely worth a try.
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Old 23rd May 2004, 01:49 PM   #7
chrish is offline chrish  Australia
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Not sure if it will suit your requirements, but Brown Dog make a converter that will allow you to mount two single SMD or DIP op amps to make a dual op amp DIP package. I am using these to construct an active crossover using OPA627 single op amps (the pcb I have uses dual op amp DIP).

Chris
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Old 24th May 2004, 07:57 AM   #8
amb is offline amb  United States
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Not a dual op amp, but the Analog Devices AD797 has 0.9nV/sqrt(Hz). This is one of the quietest op amps for audio you'd find. If you must use a dual, you can put two AD797s on a Browndog adapter model 021001. Digi-Key and Newark carry Analog Devices chips.
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