OPA4192_15 Datasheet, PDF (22/51 Pages) Texas Instruments – OPAx192 36-V, Precision, Rail-to-Rail Input/Output, Low Offset Voltage, Low Input Bias Current Op Amp with e-trim™

OPA192, OPA2192, OPA4192
SBOS620D – DECEMBER 2013 – REVISED SEPTEMBER 2015
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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 OPAx192 family are shown in Figure 51
and Figure 52.
1
0.8
SOIC
0.6
+3 
0.4
+
0.2
0
-0.2
-0.4
-
-0.6
-3 
-0.8
-1
±75 ±50 ±25 0
25 50 75 100 125 150
Temperature (ƒC)
C001
Figure 51. Input Offset Voltage Drift vs Temperature
(OPA192ID and OPA2192ID)
1.1
0.9
SOT and VSSOP
+3 
0.7
0.5
+
0.3
0.1
-0.1
-0.3
-0.5
-
-0.7
-0.9
-3 
-1.1
±75 ±50 ±25 0
25 50 75 100 125 150
Temperature (ƒC)
C001
Figure 52. Input Offset Voltage Drift vs Temperature
(OPA192IDBV, OPA192IDGK, and OPA2192IDGK)
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 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:
ΔV_OS = ΔT × dV_OS/dT
where
• ΔV_OS = Change in input offset voltage
• ΔT = Change in temperature
• dV_OS/dT = Input offset voltage drift
(1)
For example, determine the amount of OPA192ID 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.
75
6 Typical Units Shown
50
3
25
0
±25
-3 
±50
±75
±75 ±50 ±25
0 25 50 75 100 125 150
Temperature (ƒC)
C001
Figure 53. Input Offset Voltage Drift vs Temperature for Six Typical Units
22
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