OP2134 Power Supply Question

[gramo]

Can the OP2134 be powered from a single supply (0 to 9V in my case), as the data sheet specifies the min Power Supply Range as +-2.5V and Max as +-18V

 

[gramo]

Here's a link for the datasheet

https://www.electro-tech-online.com/custompdfs/2007/05/opa134.pdf

 

[ericgibbs]

G day gramo,

The spec sheet states dual, but I would expect that if you are using it as an AC amplifier, you could use a potential divider on one the inputs to bias it halfway from the single voltage rail.

Also AC couple the input/output. What are you using it for ? [just nosy]

Regards

 

[gramo]

Hmm. I was hoping that no one would say that >< I just brought a couple...

It was to be an upgrade for my signal generator buffer amp... the signal is 0 to 5V, 0 to 2Mhz. The LM324 I use at the moment doesn't produce very clean signals at higher frequencies

 

[gramo]

So the +-2.5V would not be an indication that it only requires a minimum 5V difference between rails, but actually needs a -Ve supply (and a +Ve) starting at +-2.5V?

 

[ericgibbs]

From my experience if an amplifier is designed to work on single supply it can input/output swing at least to the 0Vrail, sometimes a little lower. If its designed for dual supply only, its possible that it would not output swing to -0V???

A simple dual supply seems the best option, then you can DC offset the SigGen signal to suit what you are testing. The +/- V Sig is useful when testing comparators ref'd to 0V.

Use the DC offset when testing window/threshold comparators.

 

[audioguru]

Any opamp works fine from a single supply voltage if its input is biassed near half the supply voltage with two resistors and input and output coupling capacitors are used.

The OPA2134 dual opamp can have a sine-wave output of 5V p-p up to about 1.5MHz if its gain is only 1. The sine-wave might look nasty because at such a high frequency the opamp doesn't have much negative feedback. Above 1.5MHz its output will be slew-rate limited into a triangle wave.

Square-waves above about 50kHz will have sloping rise and fall edges.

 

[gramo]

Any opamp works fine from a single supply voltage if its input is biassed near half the supply voltage with two resistors and input and output coupling capacitors are used.

The OPA2134 dual opamp can have a sine-wave output of 5V p-p up to about 1.5MHz if its gain is only 1. The sine-wave might look nasty because at such a high frequency the opamp doesn't have much negative feedback. Above 1.5MHz its output will be slew-rate limited into a triangle wave.

Square-waves above about 50kHz will have sloping rise and fall edges.

Thanks guru, looks like I wont be able to achieve the full range of the signal generator..

Anyone know of a replacement for the LM324? It's basically a single supply OpAmp, no need for it to be rail to rail, infact, I can drive it with up to 12V if necessary

 

[audioguru]

The LM324 does not have rail to rail outputs. Its output voltage can go to ground if the load sinking current is very small, and its inputs work when they are at 0V.
It has poor performance because it is the first low power quad opamp.

The MC33171 single, MC33172 dual and MC33174 quad opamps are also low power, have outputs that go to ground and have inputs that operate at 0V. Their minimum supply voltage is 3.0V like the LM324. But they do not have crossover distortion like the LM324 has and they have a bandwidth up to 35kHz while the LM324 barely makes it up to only 6kHz.

The MC34071 single, MC34072 dual and MC34074 quad opamps have a normal supply current, have outputs that go to ground and have inputs that work at 0V. Their minimum supply voltage is 3.0V like the LM324.
Their bandwidth is up to 100kHz.

 

[gramo]

Thanks Audioguru!


Great explanation