SM74601 Datasheet, PDF (10/14 Pages) Texas Instruments – SOT-23 Precision Micropower Series Voltage Reference

SM74601
SNOSBA5A – SEPTEMBER 2011 – REVISED APRIL 2013
125°C
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V_REF1
25°C
Time
V_REF2
-40°C
Figure 17. Illustrative Temperature Profile
This may be expressed analytically as the following:
V_HYS =
lV_REF1 - V_REF2l
V_REF
x 10³ mV
where
• V_HYS = Thermal hysteresis expressed in ppm
• V_REF = Nominal preset output voltage
• V_REF1 = V_REF before temperature fluctuation
• V_REF2 = V_REF after temperature fluctuation.
(2)
The SM74601 features a low thermal hysteresis of 190 µV from -40°C to 125°C.
TEMPERATURE COEFFICIENT
Temperature drift is defined as the maximum deviation in output voltage over the operating temperature range.
This deviation over temperature may be illustrated as shown in Figure 18.
Voltage
V_{REF_MAX}
Temperature
V_{REF_MIN}
Temperature Range
Figure 18. Illustrative Temperature Coefficient Profile
Temperature coefficient may be expressed analytically as the following:
T_D =
(V_{REF_MAX} - V_{REF_MIN})
V_REF x 'T
x
10⁶
ppm
• T_D = Temperature drift
• V_REF = Nominal preset output voltage
• V_{REF_MIN} = Minimum output voltage over operating temperature range
• V_{REF_MAX} = Maximum output voltage over operating temperature range
• ΔT = Operating temperature range.
(3)
The SM74601 features a low temperature drift of 100 ppm (max), from -40°C to 125°C.
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