LLSD103A-7 Datasheet, PDF (6/18 Pages) Texas Instruments – LM20 2.4V, 10μA, SC70, DSBGA Temperature Sensor

LM20
SNIS106P – DECEMBER 1999 – REVISED FEBRUARY 2013
Typical Performance Characteristics
Temperature Error
vs
Temperature
www.ti.com
Figure 3.
PCB LAYOUTS USED FOR THERMAL MEASUREMENTS
Figure 4. Layout Used For No Heat Sink Measurements
Figure 5. Layout Used For Measurements With Small Heat Sink
LM20 Transfer Function
The LM20 transfer function can be described in different ways with varying levels of precision. A simple linear
transfer function, with good accuracy near 25°C, is
V_O = −11.69 mV/°C × T + 1.8663 V
(1)
Over the full operating temperature range of −55°C to 130°C, best accuracy can be obtained by using the
parabolic transfer function.
V_O = (−3.88×10^−6×T²) + (−1.15×10^−2×T) + 1.8639
(2)
solving for T:
(3)
A linear transfer function can be used over a limited temperature range by calculating a slope and offset that give
best results over that range. A linear transfer function can be calculated from the parabolic transfer function of
the LM20. The slope of the linear transfer function can be calculated using the following equation:
m = −7.76 × 10^−6× T − 0.0115,
(4)
6
Submit Documentation Feedback
Product Folder Links: LM20
Copyright © 1999–2013, Texas Instruments Incorporated