ROHM Has Developed A Zero-Drift Operational Amplifier, The "LMR1002F-LB", Which Is Highly Accurate And Unaffected By Temperature Changes. With An Input Offset Voltage Of 9Μv And A Temperature Drift Of 0.05Μv/℃, This Amplifier Offers Outstanding Performance That Contributes To Achieving High-Precision Control In Industrial Equipment And Other Applications.

ROHM has developed a zero-drift operational amplifier, the "LMR1002F-LB", which is highly accurate and unaffected by temperature changes. With an input offset voltage of 9μV and a temperature drift of 0.05µV/℃, this amplifier offers outstanding performance that contributes to achieving high-precision control in industrial equipment and other applications.

In order to achieve sustainable development, the functions of automotive and industrial equipment are constantly increasing, and their performance is improving. As a result, the control precision of application products is becoming higher. In this context, the use of sensors for environmental monitoring, such as temperature, pressure, and carbon dioxide concentration, has increased. However, the signals from sensors are very small and need to be amplified by operational amplifiers. For example, when amplifying the sensor signal by 1000 times using a general-purpose operational amplifier with an input offset voltage of 1mV, the offset voltage will also increase by 1000 times, resulting in a voltage error of 1V (1000mV) in the output signal. Additionally, the input offset voltage drift of operational amplifiers tends to change with temperature and time, making it difficult to calibrate at the application product level. To address these challenges, ROHM has developed a zero-drift operational amplifier that can solve these problems, leveraging its years of accumulated analog circuit technology expertise.

The new product is ROHM's first zero-drift operational amplifier that uses the chopper stabilization technique. In the past, the maximum input offset voltage of low-offset voltage operational amplifiers was 150µV, but the new product has a maximum input offset voltage of only 9µV, a reduction of 94%. This eliminates the need for peripheral components and software adjustments for input offset voltage, helping to reduce design time and costs. Furthermore, within the operating temperature range of -40℃ to +125℃, the maximum input offset voltage drift is only 0.05µV/℃, making it the lowest temperature drift among ROHM's operational amplifier products. As the new product can accurately amplify sensor signals without being affected by temperature or other environmental changes, it contributes to high-precision control of industrial equipment running in factories. With a wide power supply voltage range of 2.7V to 5.5V and support for rail-to-rail input/output, it is suitable for various industrial equipment applications.

The new product has been in mass production since November 2023, with a monthly production volume of 1 million units (sample price of 1,100 yen per unit, excluding tax). The production base for the front-end process is ROHM Hamamatsu Co., Ltd. (Hamamatsu, Japan), and for the back-end process, it is ROHM Electronics Philippines, Inc. (Philippines). Additionally, the new product is already being sold through e-commerce platforms such as Ameya360, Sekorm, and Right IC.

In the future, ROHM will strive to improve the performance of zero-drift operational amplifiers and continue to expand its product lineup. At the same time, we will continuously work on improving the performance of operational amplifiers in low noise, low offset voltage, energy efficiency, and expanding the power supply voltage range to meet the needs of the automotive and industrial equipment markets. We will also contribute to solving social issues by enhancing the control precision of application products.

Product lineup

Application example

· Industrial equipment: power control inverter, photovoltaic inverter, battery monitoring, pressure gauge, flow meter, temperature controller, gas detection, etc

· Consumer electronics: refrigerators, washing machines, air conditioners, etc

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