OPA191_17 datasheet(21/49 Pages) TI1

Part #	OPA191

Description	Low Power, Precision, CMOS, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp

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-1.2

-0.9

-0.6

-0.3

0

0.3

0.6

0.9

1.2

±75

±50

±25

0

25

50

75

100

125

150

Temperature (

ƒC)

C001

1

-1

-3 1

+3 1

21

OPA191, OPA2191, OPA4191

www.ti.com

SBOS701A – DECEMEBER 2015 – REVISED APRIL 2016

Product Folder Links: OPA191 OPA2191 OPA4191

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Input Offset Voltage Drift (continued)

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 50.

Figure 50. Input Offset Voltage Drift vs Temperature

(SOIC Package)

As illustrated in Figure 50, 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 50 when performing an error analysis.

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

ΔVOS = ΔT × dVOS/dT

where

•

ΔVOS = Change in input offset voltage

•

ΔT = Change in temperature

•

dVOS/dT = Input offset voltage drift

(1)

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 50, 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 50 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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