TIDA-01513: replace opa320-q1

Samuel Svensson

Part Number: TIDA-01513
Other Parts Discussed in Thread: OPA320-Q1, LM2904LV-Q1, TINA-TI

Tool/software:

Hi team,

A customer is interested in this reference design, TIDA-01513. And there's a part of it using OPA320-Q1. They were wondering, can they replace OPA320-Q1 with LM2904LV-Q1?

I notice there's a big difference in speed and offset, but is there any other major difference between then? Making it hard to use LM2904LV-Q1?

Thanks in advance

Kind regards,

Sam

3 months ago

0 Samuel Svensson 3 months ago

TI__Intellectual 940 points

I was also wondering, does it exist any TINA-TI simulation data for this? Which is accessible for customers, we're in the process to obtain an NDA with them.

Kind regards,

Sam

0 Samuel Svensson 3 months ago in reply to Samuel Svensson

TI__Intellectual 940 points

Hi again,

They are now stuck with gain calculations for their requirement. They have a TinaTI circuit which they attached in the e-mail, can I send it through e-mail to you?

They wrote like this:

Can you please help us with explanation on how input and feedback resistors are selected?

Our requirement: HV input range= 0 to 84V, Vref= 1.65V, Vsupply to opamp= 0 to 3.3V, Viso out= 0 to 3.3V ADC range.

I am trying to use Inverting op amp with non-inverting positive reference voltage circuit (Rev. A) formulas but it does not work as expected and not sure what I am missing.

Kind regards,

Sam

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TIDA-01513: replace opa320-q1