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[Moved]: CA3140AE Op amplifier ic

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omerysmi

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Hi,
I've tried to use CA3140AE IC as a buffer, i putted 5v in the (+) pin but the problem is that my output is 3V and not 5V.
This is the scheme:

BUF.png

Why i don't get 5v in the output in your opinion?

CA3140AE datasheet:
https://www.intersil.com/content/dam/Intersil/documents/ca31/ca3140-a.pdf
 

Re: CA3140AE Op amplifier ic

Look for datasheet parameters (At V+ = 5V, V- = 0V)
- Common Mode Input Voltage Range
- Maximum Output Voltage

According to specifications, the buffer can be expected to work between 0.13 and 2.6V

The device isn't specified as rail-to-rail OP. Even a rail-to-rail OP buffer won't reach the supply rail voltage exactly.
 

Re: CA3140AE Op amplifier ic

FvM said:
Look for datasheet parameters (At V+ = 5V, V- = 0V)
- Common Mode Input Voltage Range
- Maximum Output Voltage

According to specifications, the buffer can be expected to work between 0.13 and 2.6V

The device isn't specified as rail-to-rail OP. Even a rail-to-rail OP buffer won't reach the supply rail voltage exactly.
Click to expand...

Do you know another ic which will help me to make it? maybe lm741 or lm358?
 
Last edited:

Re: CA3140AE Op amplifier ic

None of the mentioned classical OPs provides rail-to-rail operation. You need to look for more recent types, each vendor has suitable types.
 

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