Opamp for low-voltage supplies

EchoWars · 9th June 2009, 02:24 AM

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).

Mr Evil · 9th June 2009, 02:34 AM

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.

Iain McNeill · 9th June 2009, 03:16 AM

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 $$$)

satoru · 9th June 2009, 11:52 PM

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

KSTR · 10th June 2009, 12:47 AM

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

sparcnut · 10th June 2009, 01:04 AM

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.

EchoWars · 10th June 2009, 11:40 PM

I'm not sure if I want to battle a 3KV/µS 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...

syn08 · 10th June 2009, 11:49 PM

Quote:

Originally posted by EchoWars
I'm not sure if I want to battle a 3KV/µS 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

EchoWars · 11th June 2009, 12:58 AM

Guess I should have said that I need a dual opamp with a standard pinout.

syn08 · 11th June 2009, 01:32 AM

Quote:

Originally posted by EchoWars
Guess I should have said that I need a dual opamp with a standard pinout.

OPA2822
TLC072
MAX412

9th June 2009, 02:24 AM	#1
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	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).

9th June 2009, 02:34 AM	#2
Mr Evil diyAudio Member Join Date: Aug 2004 Location: Behind you	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. __________________ https://mrevil.asvachin.eu/

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9th June 2009, 03:16 AM	#3
Iain McNeill diyAudio Moderator Emeritus Join Date: Oct 2007 Location: Santa Cruz, California	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 $$$)

9th June 2009, 11:52 PM	#4
satoru diyAudio Member Join Date: Jan 2007 Location: Berkeley, California	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

10th June 2009, 12:47 AM	#5
KSTR diyAudio Member Join Date: Jul 2007 Location: Central Berlin, Germany	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

10th June 2009, 01:04 AM	#6
sparcnut diyAudio Member Join Date: Dec 2007	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.

10th June 2009, 11:40 PM	#7
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	I'm not sure if I want to battle a 3KV/µS 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...

11th June 2009, 12:58 AM	#9
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	Guess I should have said that I need a dual opamp with a standard pinout.