LMV321: Calculate Vout

Shu-Cheng LIN

Part Number: LMV321

Hi Sirs,

Sorry to bother you.

We would like to use LMV321 to replace Microchip MCP6001

If our schematic reference is follows, Vsupply=3.3V, Vref=0.5V, C1=470pF, Rfeedback and Rflexforce are variable resistors, we will get Vout=?

Can you help us to list the formula?

Thanks!!

over 6 years ago

0 Ron Michallick over 6 years ago

TI__Guru**** 152056 points

Hello Shu-Cheng

DC output voltage will be (Vref + Vio) * (1 + Rfeedback / Rflexiforce) limited to 3.3V maximum. Vio is input offset error of the op amp.

0 Ron Michallick over 6 years ago in reply to Ron Michallick

TI__Guru**** 152056 points

Shu-Cheng

Here is a cookbook circuit has has helpful information

Non-Inverting Amplifier Circuit

Other options for a cross ref

What are the best cross reference replacement for the MCP6001, MCP6002, and MCP6004 devices?

0 Shu-Cheng LIN over 6 years ago in reply to Ron Michallick

Guru 11785 points

Hi Sirs,

Thanks for your quick reply.

We have finished schematic as below

Could you help double check it?

Any suggestion are welcome.

0 Ron Michallick over 6 years ago in reply to Shu-Cheng LIN

TI__Guru**** 152056 points

Shu-Cheng,

I know nothing about the CON2806 device. If it is resistive or provides a current then it should work fine.
Adding a capacitor from pin 1 of op amp to ground will help keep 3.3V supply noise out of the output signal.

Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

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LMV321: Calculate Vout