7

LM61

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SNIS121J – JUNE 1999 – REVISED NOVEMBER 2016

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7 Detailed Description

7.1 Overview

The LM61 is a precision integrated-circuit temperature sensor that can sense a –30°C to 100°C temperature

range using a single positive supply. The output voltage of the LM61 has a positive temperature slope of

10 mV/°C. A 600-mV offset is included, enabling negative temperature sensing when biased by a single supply.

The temperature-sensing element is comprised of a delta-VBE architecture. The temperature-sensing element is

then buffered by an amplifier and provided to the VOUT pin. The amplifier has a simple class A output stage as

shown in Functional Block Diagram.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 LM61 Transfer Function

The LM61 follows a simple linear transfer function to achieve the accuracy as listed in Electrical Characteristics.

Use Equation 1 to calculate the value of VO.

VO = 10 mV/°C × T°C + 600 mV

where

•

T is the temperature in °C

•

VO is the LM61 output voltage

(1)

7.4 Device Functional Modes

The only functional mode of the LM61 device is an analog output directly proportional to temperature.