ROHM Semiconductor introduced the new LMR1002F-LB zero-drift operational amplifier (op amp). It is designed for industrial and consumer electronics devices and minimizes both input offset voltage and input offset voltage temperature drift. Capable of accurately amplifying output signals from sensors installed in various measurement devices, this new op amp is ideal for current sensing applications such as power control inverters and temperature/pressure/flow/gas detectors.
As automotive and industrial equipment become more sophisticated and application control requirements are more precise, environmental sensors are increasingly being used to quantify temperature, pressure, and gas concentrations such as carbon dioxide to foster a sustainable society. However, sensor signals are so small that amplification is necessary, and if a general op amp with 1mV offset voltage is used to amplify the sensor signal by a factor of 1,000, for example, the offset voltage also increases by this amount, resulting in a voltage error of 1V (1,000mV) in the signal output. At the same time, the input offset voltage temperature drift, which varies according to temperature and time, is difficult to compensate for.
In response, ROHM developed a zero-drift op amp that addresses these problems by leveraging proprietary analog circuit technology cultivated over many years. The LMR1002F-LB is ROHM’s first zero-drift op amp using the chopper method. In contrast to conventional low-offset op amps featuring a typical input offset voltage of 150µV (max.), ROHM’s new product limits input offset voltage to just 9µV (94% lower). This eliminates the need for peripheral components or software to adjust the input offset voltage, reducing both design person-hours and costs. In addition, the input offset voltage temperature drift is just 0.05µV/°C (max.) in the operating temperature range of -40°C to +125°C – the lowest among ROHM’s op amps. Enabling accurate amplification of measured sensor signals without being affected by environmental changes such as temperature contributes to high accuracy control of industrial equipment in factories. This, coupled with a wide supply voltage range of 2.7V to 5.5V and rail-to-rail input/output, make it ideal for a variety of industrial applications.
Going forward, ROHM will continue to improve the performance and expand its lineup of zero-drift op amps. Moreover, ROHM will work to improve the performance of op amp lineups by reducing noise and offset while increasing power savings and will expand the power supply voltage range demanded in the automotive and industrial equipment markets. The overall goal: contributing to solving social issues through higher accuracy application control.
Product Lineup
View the product lineup here.
Application Examples
- Industrial equipment: Power control inverters, photovoltaic inverters, storage battery monitoring, pressure gauges, flow meters, temperature controllers, gas detectors, etc.
- Consumer appliances: Refrigerators, washing machines, air conditioners, etc.
Online Sales Information
- Sales launch date: December 2023
- Online distributors: DigiKey and Mouser
- The product will be offered at other online distributors as it becomes available
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