OPA2991: offset voltage difference between 2 amplifiers

Lillian Liu(SH)

Part Number: OPA2991

Hi team,

We are using TI Dual OPA OPA2991IDSGR as Differential input voltage follower configuration.

We want to know what is offset voltage difference between 2 amplifiers, i.e. Voffset_1-Voffset_2. But no information in datasheet.

25C Full Temp

Voffset_1 - Voffset_2 ? ?

Could you help check this, thank you!

Lillian

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 314600 points

The two offsets are basically independent. It would be possible for the two amplifiers to have offsets of −780 µV and +780 µV, for a total offset between them of 1.56 mV.

0 Caro Walter over 1 year ago in reply to Clemens Ladisch

TI__Mastermind 21642 points

Hey Lillian,

Clemens is correct, two op amps within the same package have uncorrelated offset voltages. This is because offset voltage is the mismatch of the input transistors.

TIPL Vos training: https://www.ti.com/video/series/precision-labs/ti-precision-labs-op-amps.html

All the best,
Caro

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OPA2991: offset voltage difference between 2 amplifiers