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amplifier for a scope

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LAN_403

cavemen

Sun Oct 17 2010, 06:13PM

Registered Member #2008 Joined: Tue Mar 03 2009, 05:11AM
Location: USA, Frederick, MD
Posts: 118

I have got an ARM32 module.
Back in the day I asked for advice on a computer oscilloscope circuit and Bjorn recommended me this circuit. It can do more.

It is a great chip but ADC converter onlyy processes the 3.3v signal.
Now I have got 2 OPAMPS to decouple the chip, protect it and make sure the level of input is 3.3 V.

Here is a circuit I found in the datasheet for the amp and I would like to know if it is suitable for brinning the input of the OSCILLOSCOPE to 3.3V level.

Can I use the same circuit to bring the level of the DAC output of the ARM32 stamp up to the level I want?

How do they define the values of resistors on OPAMP based circuits?

Thank You.
V.T.

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