RC4136: What to do with unused Op Amps?

Ben Danziger

Part Number: RC4136

Hi All, if I am not using all four op amps in an RC4136, what's the safest thing to do with the unused terminals? Floating? Ground? Add an unnecessary buffer stage?

over 4 years ago

0 Ron Michallick over 4 years ago

TI__Guru*** 144676 points

Ben,

Best would to setup a buffer stage. Do not directly ground the buffer input. Add some resistance between input and ground. 1k to 10k will be fine.

0 Ben Danziger over 4 years ago in reply to Ron Michallick

Prodigy 20 points

If a buffer stage is undesirable (for any reason), what is the recommended way to isolate the last stage?

0 Ron Michallick over 4 years ago in reply to Ben Danziger

TI__Guru*** 144676 points

Ben,

The recommendation for unused amplifiers (section 7.2) in this application note for a somewhat similar op amp should also apply to RC4136 (other than soft VOL).

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RC4136: What to do with unused Op Amps?