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Old 20th January 2004, 09:56 AM   #1
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Default op amp supply range

Hi

In some data sheets maximum operating voltage is specified as +/- 18V and in others it is V+ to V- is 36V. Some data sheets give both values.

Can I use every op amp with +24V / - 6V instead of +/- 15V ?


Bernhard
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Old 20th January 2004, 10:26 AM   #2
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Default Re: op amp supply range

Quote:
Originally posted by Bernhard
Hi

In some data sheets maximum operating voltage is specified as +/- 18V and in others it is V+ to V- is 36V. Some data sheets give both values.

Can I use every op amp with +24V / - 6V instead of +/- 15V ?


Bernhard

Yes, but your maximum symmetric output level will be limited to +/- 5 V or so. In fact, the opamp doesn't "know" the supply levels. The only thing it sees is the total level between V+ and V-, and that should be limited to 30 V (in your example). It is when you start to put DC levels on the inputs that the opamp is "positioned" within the supply range.

Jan Didden
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Old 20th January 2004, 06:01 PM   #3
Zombie is offline Zombie  Sweden
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Hello fellow CD63 modder!
From Bobwire's mods I would warmly recommend to match the 10k and 27k resistors of the diff.amps after the DAC within 0,1% or better. It makes a huge difference in sound quality and it's easily done, too.

Cheers,
Tom
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Old 21st January 2004, 12:30 PM   #4
Praise! is offline Praise!  Australia
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Default Re: op amp supply range

Quote:
Originally posted by Bernhard
Hi

In some data sheets maximum operating voltage is specified as +/- 18V and in others it is V+ to V- is 36V. Some data sheets give both values.

Can I use every op amp with +24V / - 6V instead of +/- 15V ?


Bernhard

Hi Bernhard,

The max supply voltage of opamps is usually 36V across the supply
terminals. You can put +18V / -18V or +6V / -30V, either way will
not damage the opamp. The opamp itself has NO ground terminal.
The ground terminal is outside the opamp. If you supply the former,
your output swing will be around +/-16V. However, if you supply the
latter, your output swing will be limited to +4V / -28V.

Some audio opamps have high supply voltage. Examples:

Burr Brown OPA604 +/-24V
Burr Brown OPA445 +/-45V

In a power amp I designed, to be released in Silicon Chip Magazine,
I am using the OPA604 @ +/-24V and I get 27W of Class A power.

I hope this info helps!!

James Yung
Praise! Audio
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Old 21st January 2004, 12:35 PM   #5
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Default Thanks @ all

What I will try is to give the op amp PSUs a virtual ground, modulate it with the input signal and get virtual +/- 24V rails for the op amps
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