LMH6629: Input spot voltage noise 1/f TINA model vs datasheet plot

Michael Steffes

Part Number: LMH6629
Other Parts Discussed in Thread: OPA1611

I was running some model tests for this next AudioExpress article - planning on using the LMH6629 - checking the 2013 model update for input spot noise, shows about what I would expect for a 1/f corner

However the datasheet plot may be labeled wrong the frequency axis - maybe that kHz should be just Hz - which is correct?

over 3 years ago

0 Hasan Babiker31 over 3 years ago

TI__Genius 15555 points

Hello Michael,

I've confirmed that the noise figure in the datasheet is similar in the original design plots, it looks like the issue is with the TINA file.

Best,

Hasan Babiker

0 Michael Steffes over 3 years ago in reply to Hasan Babiker31

Guru 47485 points

Oh my that is a high 1/f corner - fortunately, I have a composite with the OPA1611 that will fix whatever the LMH6629 physically is.

0 Michael Steffes over 3 years ago in reply to Michael Steffes

Guru 47485 points

Hey Hasan,

I was looking closer at this and the datasheet plot just has an odd y-axis - if you look close, the 1/f corner is 800Hz while the model produces about 400Hz - not bad match, I will still use the OPA1611 composite to get it lower 1/f corner.

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LMH6629: Input spot voltage noise 1/f TINA model vs datasheet plot