Difference of using the OPA381 and MCP6001 in the circuit shown.

[patan.gova]

Hello,
I want to implement the circuit upto the first stage filtering form here https://embedded-lab.com/blog/?p=5508 but I am confused of which one to use in the place of the OPAMP in the first stage of filtering.Whether to use the MCP6001(datasheet **broken link removed** ) or the TIAOPA380(datasheet https://www.ti.com/lit/gpn/opa380 ).
Can someone explain how the results or the working differs with both of them as I want to be know what to order to start working with.
Thanks in Advance.

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[chuckey]

Your application is very non critical, gain of X 100, B/W ~ 10 HZ, the only advantage might be to use a low noise OpAmp, so if they are both the same price the OPA 381 has half the noise of the MCP6001.
Frank

 

[patan.gova]

Hello Chuckey,
Thanks for the information.
And the gain-bandwidth of the OPA381 is 1MHz meaning that that gain*bandwidth=1Mhz.I am using the same circuit as illustrated in the post1 link for the first stage filtering where gain is calucaulted as Gain=1+Rf/Ri =1+680k/6.8k=101 gain.
If my working frequency limit is 0.5 hz to 2.5 hz.So, 2.5hz*gain=1Mhz resulting a max usage gain of 400000.
Is this the way to calcualte the max gain that the OP381 provides.
I am planning to use a gain of 400.Will there be any effect in the resultant signal if the gain>500 is used?