JAJSNM7C December 2021 – September 2024 REF35
PRODUCTION DATA
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The REF35 is designed and tested for a low output voltage temperature coefficient. The temperature coefficient is defined as the change in output voltage over temperature. The temperature coefficient is calculated using the box method in which a box is formed by the minimum/maximum values for the nominal output voltage over the operating temperature range. REF35 has a low maximum temperature coefficient of 12ppm/°C from –40°C to +105°C. The box method specifies limits for the temperature error but does not specify the exact shape and slope of the device under test. Due to temperature curvature correction to achieve low-temperature drift, the temperature drift is expected to be non-linear. See TI's Analog Design Journal, Precision voltage references, for more information on the box method. Use Equation 1 for the box method.
Figure 7-3 shows a typical voltage versus temperature curves for various reference voltages in SOT23 package. Figure 7-4 shows the distribution of temperature coefficients for REF35250 devices in SOT23 package.