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).
Signal levels will be at a standard line level... (1VRMS or thereabouts).
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.
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.
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 $$$)
TI has a great selection and Analog Devices has a whole range of 2.7V+ op-amps depending on your needs (rail-rail outputs, low noise, low power, high output current, low offset - just don't pick all unless you want to pay $$$)
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
Have fun!
Satoru
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
- Klaus
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.
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...
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...
EchoWars said: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
Whoa, these opamps really scare me. Don't want to imagine how opamps will perform in say 5-10 years.
Have fun, Hannes
Have fun, Hannes
TS971 is best value for money amongst the ones I could find, followed by ADA4841-1. If you need best performances, the LT.
And all available in SOT23-5, which was what I was after.
😉
Patrick
PS You did not say you were looking for duals in 8-pin.
And all available in SOT23-5, which was what I was after.
😉
Patrick
PS You did not say you were looking for duals in 8-pin.
AD8397 is a very good candidate for this position I think! It has a very balanced sound with also good THD, SNR etc specs.. Plus has a lot of current output capability if needed.
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