-1

-0.8

-0.6

-0.4

-0.2

0

0.2

0.4

0.6

0.8

1

±75

±50

±25

0

25

50

75

100

125

150

Temperature (

ƒC)

C001

+3 1

-3 1

- 1

+ 1

SOIC

-1.1

-0.9

-0.7

-0.5

-0.3

-0.1

0.1

0.3

0.5

0.7

0.9

1.1

±75

±50

±25

0

25

50

75

100

125

150

Temperature (

ƒC)

C001

+3 1

-3 1

- 1

+ 1

SOT and VSSOP

21

OPA192-Q1, OPA2192-Q1, OPA4192-Q1

www.ti.com

SBOS850 – MAY 2017

Product Folder Links: OPA192-Q1 OPA2192-Q1 OPA4192-Q1

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Copyright © 2017, Texas Instruments Incorporated

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 OPAx192-Q1 family are shown in Figure 51

and Figure 52.

Figure 51. Input Offset Voltage Drift vs Temperature

(OPA192-Q1ID and OPA2192-Q1ID)

Figure 52. Input Offset Voltage Drift vs Temperature

(OPA192-Q1IDBV, OPA192-Q1IDGK, OPA2192-Q1IDGK,

and OPA4192-Q1IPW)

As shown in Figure 51, 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: VS = ±4 V to ±18 V

(VS = 8 V to 36 V) and Electrical Characteristics: VS = ±2.25 V to ±4 V (VS = 4.5 V to 8 V) tables. If a reduced

temperature range is applicable, use the information shown in Figure 51 or Figure 52 when performing an error

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

where

•

•

ΔT = Change in temperature

•

(1)

For example, determine the amount of OPA192-Q1ID 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 51, the input offset drift is typically 0.15 µV/°C. This

input offset drift results in a typical input offset voltage change of (75°C – 25°C) × 0.15 µV/°C = 7.5 µV .

For 3 σ (99.7%) of the units, Figure 51 shows a typical input offset drift of 0.4 µV/°C. This input offset drift results

in a typical input offset voltage change of (75°C – 25°C) × 0.4 µV/°C = 20 µV.

Figure 53 shows six typical units.