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Part Number: OPA2333
Hi team.I'd like to know about the input noise accuracy.The input noise is typ value.Is there Min and Max value as a reference value.If you don't have it, I'd like to know what the Max/Min is likely to be.My customer is having trouble with input noise and they suspect it is the cause.
what noise level is he observing?
Often noise is a demodulation of EMI. Then HF low pass filtering can help a lot. Can you tell more about the project? Can you share a schematic?
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In reply to kai klaas69:
Hi Kai.Thank you for your reply.I understood about EMI noise.However, I'd like to know the amount of noise in the amplifier itself.Sincerely.Kengo.
In reply to Kengo.Y:
I think there are no min max values available.
The typical total integrated input voltage noise for OPA2333 max noise bandwidth (G=1) is 48uVrms - see below - but this does not include current noise (it depends on the input impedance) and the noise from the external passive components like resistors and EMI/RFI.
As a rule of thumb, the broadband noise may vary over process variation up to +/-30% while 1/f noise may double from its typical value. Thus if your customer uses the OPA2333 in a buffer configuration, its total noise is dominated by the broadband noise and a max variation of 30% from its typical value would translate into ~+16% increase in total noise from the value simulated above.
Marek Lis, MGTSSr Application EngineerPrecision Analog - TI Tucson
In reply to Marek Lis:
Good info Marek, and again a schematic would help a lot to make sure we are not chasing the wrong issue.
Also, 1/f doubling from typ value? Perhaps, at least on a chopper like the OPA2333 there is no 1/f noise.
In reply to Michael Steffes:
Yes, that is true that you do not need to worry about 1/f input voltage noise in chopper amplifiers BUT because of the IB spikes coming from the chopping action of the front-end switches, you need to worry much more about conversion of those current spikes across the source and/or input resistance into voltage spikes that may result in a large input offset voltage error in configurations with unmatched input impedances.
All the more reason to start with the schematic on these types of questions
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