INA181: Detailed block diagram

franziskus

Expert 8379 points

Part Number: INA181
Other Parts Discussed in Thread: OPA197

Team,

do we have a more detailed block diagram of the INA181 internals?

Please see OPA197 as an explanation of what I mean:

Thanks

over 3 years ago

+1 Carolus Andrews over 3 years ago

TI__Mastermind 22650 points

Franziskus,

The diagram you present is not an SBD, but a diagram of the ESD diodes inside the block. Is this the detail the customer desires here? If so, can you explain why they need this information? In my opinion, this would simply complicate the functional information, as the ESD cells are not important to the block diagram, provided the customer is operating the device inside the absolute maximums of the device.

+1 kai klaas69 over 3 years ago

Guru 140200 points

Hi Franziskus,

the key element of the INA181 is the box called "Bias" as shown in figure 48 of datasheet. What's going on in this box is a TI's company secret and I don't think that you will get any detailed information on this bias circuitry from the manufacturer.

Kai

+1 Carolus Andrews over 3 years ago in reply to kai klaas69

TI__Mastermind 22650 points

Franz,

Kai is correct here. We will not be able to share the internals of the input stage. Please let me know what additional detail the customer was looking for here.

0 franziskus over 3 years ago in reply to Carolus Andrews

TI__Expert 8379 points

Thank you all for your replies!

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INA181: Detailed block diagram