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Old 9th June 2009, 02:24 AM   #1
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Default Opamp for low-voltage supplies

What opamp works well with low voltage supplies? I have an application where my supply voltages are limited to +/-5V and cannot be changed, so I was wondering if there was a decent opamp designed to work well at these levels?

Signal levels will be at a standard line level... (1VRMS or thereabouts).
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Old 9th June 2009, 02:34 AM   #2
Mr Evil is offline Mr Evil  United Kingdom
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There are loads of op-amps like that, thanks to the popularity of battery powered equipment. For instance, OPA365 seems to be perfect for audio (I have some myself, but haven't tested them yet).

EDIT: Not that one, as it has a maximum of 5.5V supply voltage. Go to Texas Instruments' site and look there - they do plenty of others.
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Old 9th June 2009, 03:16 AM   #3
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Exactly right.

TI has a great selection and Analog Devices has a whole range of 2.7V+ op-amps depending on your needs (rail-rail outputs, low noise, low power, high output current, low offset - just don't pick all unless you want to pay $$$)
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Old 9th June 2009, 11:52 PM   #4
satoru is offline satoru  United States
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The famous audio op-amps from National (LM4562, LME49XXX series including LME49722) all work from +/- 2.5V albeit a little a bit worse THD+N (max output signal has to be reduced so it is inevitable anyway).

Have fun!
Satoru
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Old 10th June 2009, 12:47 AM   #5
KSTR is offline KSTR  Germany
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Many so-called low-voltage opamp (with rail-to-rail inputs) have common-mode issues (ususally buried in the datasheet)... so run them inverting mode to stay out of trouble... but 10V total supply voltage is not likely to be a problem (<5V is).

- Klaus
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Old 10th June 2009, 01:04 AM   #6
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For +/-5v you may be interested in the LM6171/LM6172(dual). Very fast with low distortion, good driving capability, and 2.5mA/channel idle current. See also LM7171.
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Old 10th June 2009, 11:40 PM   #7
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I'm not sure if I want to battle a 3KV/S opamp for stability.

I know that most opamps are rated for use down to +/-5V, but I thought there might be one or two that are both good for audio, and designed for low voltage rails...
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Old 10th June 2009, 11:49 PM   #8
syn08 is offline syn08  Canada
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Quote:
Originally posted by EchoWars
I'm not sure if I want to battle a 3KV/S opamp for stability.

I know that most opamps are rated for use down to +/-5V, but I thought there might be one or two that are both good for audio, and designed for low voltage rails...
ADA4899
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Old 11th June 2009, 12:58 AM   #9
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Guess I should have said that I need a dual opamp with a standard pinout.
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Old 11th June 2009, 01:32 AM   #10
syn08 is offline syn08  Canada
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Quote:
Originally posted by EchoWars
Guess I should have said that I need a dual opamp with a standard pinout.
OPA2822
TLC072
MAX412
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