8.3 Feature Description

8.3.1 Input Offset Trimming

The OPAx205 are the industry's first e-trim operational amplifiers built on a bipolar process. The input offset

voltage of an amplifier is determined by the inherent mismatch between the input transistors. The offset can be

minimized using laser-trimming performed during the manufacturing process while the devices are still in the

bare silicon form. However, when the silicon is packaged, the packaging process introduces additional offset due

to mechanic stresses. TI's new trimming processes are used to trim the offset after the packaging process is

complete to minimize both inherent and package-induced offsets. After trimming, communication is disabled to

make sure the amplifiers operate properly in the final system.

A comparison between production offset values for the industry-popular, laser-trimmed OPA2277 and the

OPAx205 proprietary trim can be seen in Figure 8-1 and Figure 8-2.

Offset Voltage (µV)

– 50– 45– 40– 35– 30– 25– 20– 15– 10 – 5 0 5 10 15 20 25 30 35 40 45 50

16

14

12

10

8

6

4

2

0

Typical distribution

of packaged units.

Single, dual, and

quad included.

Figure 8-1. OPA2277 Laser-Trimmed Operational

Amplifier Offset

Input Offset Voltage (µV)

0

5

10

15

20

25

-50

-40

-30

-20

-10

0

10

20

30

40

50

Figure 8-2. OPAx205 e-trim™ Operational Amplifier

Offset

The OPAx205 are also trimmed at two temperatures to minimize the input offset voltage drift over temperature.

The final performance of the offset drift can be seen in Figure 8-3.

Offset Voltage Drift (µV/°C)

0

3

6

9

12

15

-0.1 -0.08 -0.06 -0.04 -0.02

0

0.02 0.04 0.06 0.08

0.1

Figure 8-3. OPAx205 e-trim™ Operational Amplifier Drift

www.ti.com

OPA205, OPA2205

SBOS962C – APRIL 2020 – REVISED JULY 2022

Copyright © 2022 Texas Instruments Incorporated

Submit Document Feedback

21

Product Folder Links: OPA205 OPA2205