The LM20 is a precision analog output CMOS integrated-cir- cuit temperature sensor that operates over a −55°C to +130° C temperature range. The power supply operating range is +2.4 V to +5.5 V. The transfer function of LM20 is predomi- nately linear, yet has a slight predictable parabolic curvature. The accuracy of the LM20 when specified to a parabolic transfer function is ±1.5°C at an ambient temperature of +30° C. The temperature error increases linearly and reaches a maximum of ±2.5°C at the temperature range extremes. The temperature range is affected by the power supply voltage. At a power supply voltage of 2.7 V to 5.5 V the temperature range extremes are +130°C and −55°C. Decreasing the pow- er supply voltage to 2.4 V changes the negative extreme to −30°C, while the positive remains at +130°C. The LM20’s quiescent current is less than 10 μ A. Therefore, self-heating is less than 0.02°C in still air. Shutdown capability for the LM20 is intrinsic because its inherent low power con- sumption allows it to be powered directly from the output of many logic gates or does not necessitate shutdown at all.
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