OPA2191 datasheet(21/59 Pages) TI

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Instead of the box method, a convenient way to illustrate input offset drift is to compute the slopes of the input

offset voltage versus temperature curve. This is the same as computing the input offset drift at each point along

the input offset voltage versus temperature curve. The results for the OPAx191 family are illustrated in Figure

7-3.

-1.2

-0.9

-0.6

-0.3

0.3

0.6

0.9

1.2

±75

±50

±25

100

125

150

Temperature (ƒC)

C001

-1

-3 1

+3 1

Figure 7-3. Input Offset Voltage Drift vs Temperature (SOIC Package)

As illustrated in Figure 7-3, the input offset drift is typically less than ±0.3 µV/°C over the range from –40°C

to +125°C. When performing an error analysis over the full specified temperature range, use the typical and

maximum values for input offset voltage drift as described in the Electrical Characteristics tables. If a reduced

temperature range is applicable, use the information illustrated in Figure 7-3 when performing an error analysis.

To determine the change in input offset voltage, use Equation 1:

ΔVOS = ΔT × dVOS/dT

(1)

where

• ΔVOS = Change in input offset voltage

• ΔT = Change in temperature

• dVOS/dT = Input offset voltage drift

For example, determine the amount of OPA191ID input offset voltage change over the temperature range of

25°C to 75°C for 1 σ (68%) of the units. As shown in Figure 7-3, the input offset drift is typically 0.25 µV/°C. This

input offset drift results in a typical input offset voltage change of (75°C – 25°C) × 0.25 µV/°C = 12.5 µV.

For 3 σ (99.7%) of the units, Figure 7-3 shows a typical input offset drift of approximately 0.75 µV/°C. This input

offset drift results in a typical input offset voltage change of (75°C – 25°C) × 0.75 µV/°C = 37.5 µV.

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OPA191, OPA2191, OPA4191

SBOS701D – DECEMBER 2015 – REVISED AUGUST 2021

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