OPA4377-Q1: Recommended handling for unused channels

Hidekazu Someno

Expert 5130 points

Part Number: OPA4377-Q1

HI Team,

What kind of processing is recommended for the IN +, IN-, and OUT terminals of unused channels?

Regards,

H.Someno

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 283290 points

It should be configured as a voltage follower (OUT to IN-), with IN+ conntected to any voltage in the common-mode input range. (See The Unused Op Amp—what to do?)

In some cases, it might be useful to use the otherwise unused amplifier as a buffer for the input or output of one of the other amplifiers.

0 Raymond Zhang1 over 3 years ago

TI__Guru 56921 points

Hi Hidekazu-san,

Clemens has replied to your questions.

The same topics are also documented in section 7 on p.27 of the application report.

https://www.ti.com/lit/an/sloa277/sloa277.pdf?ts=1610040008835&ref_url=https%253A%252F%252Fwww.google.com%252F

If you have additional questions, please let us know.

Best,

Raymond

0 kai klaas69 over 3 years ago

Guru 140200 points

Hi Someno,

this has been discussed here many times :-)

Kai

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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OPA4377-Q1: Recommended handling for unused channels