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Accuracy and repeatability is excellent for the LMT devices. Actual LMT84 data is shown in this graph. While limits are set at 2.7°C, these devices consistently have an error of less than +/-1°C, across wafers and lots and in a very linear manner. Such devices provide tight, reliable accuracy across a very wide temperature range, removing the need for linearizing circuitry. Because of the inherent linearity of analog temp sensors, while look-up tables can be used if desired, they are not necessary. Supply voltage requirements are dependent upon the minimum and maximum voltage conditions the device will experience in the system. If the device is run from a regulator or reference, and will always see the same voltage, device sensitivity may become the deciding specification. If the device is running on a battery, the maximum and minimum values drive which device to use. When choosing device sensitivity, the full scale input of the ADC converting the signal should be considered. The output voltage vs. temperature characteristics of analog temperature sensors shows the maximum output voltage from the device. Minimum VDD is dependent on minimum temperature and accuracy required. While the LMT84 is very linear over temperature and supply voltage range, due to the intrinsic behavior of an NMOS/PMOS rail-to-rail buffer, a slight shift in the output can occur when the supply voltage is ramped over the operating range of the device. This slight shift (a few millivolts) takes place over a wide change (approximately 200 mV) in VDD or VOUT. Since the shift takes place over a wide temperature change of 5°C to 20°C, VOUT is always monotonic. The accuracy specifications of the LMT84 already include this possible shift.
