Two-channel CMOS op amp is high speed for sensing systems
A two-channel, high speed, ground sense CMOS op amp in the Emarmour series by Rohm has been introduced. The BD77502FVM is optimised for consumer and industrial equipment which requires high speed sensing, such as industrial measurement and control systems.
As more electronic components are used in control applications, the increased density leads to noisier environments, making it difficult to implement designs with electromagnetic compatibility (EMC). Op amps are used to amplify small signals from sensors in detection systems, but PCB designs can be problematic for conventional op amps that are susceptible to oscillation due to capacitive loads (i.e. from wiring).
The Emarmour series has been designed to mitigate noise issues common with conventional op amps. The company has already released the noise-tolerant op amps in the family include the BD77501G single channel high-speed CMOS op amp, based on Nano Cap technology to prevent oscillation caused by load capacitance. The BD77502FVM is a two-channel version which integrates two op amp devices that prevent oscillation while providing high-speed amplification with slew rates up to 10V per microseconds and breakthrough immunity to electromagnetic interference (EMI). The output voltage across the entire noise frequency band is limited to under ±20mV, which is 10 times lower than a conventional op amp, reports Rohm. High-speed signal amplification is now achievable without being affected by external noise or load capacitance when used in devices that output small signals such as sensors, thus improving reliability while simplifying circuit designs.
The BD77502FVM can be used in industrial and consumer applications, including motors, requiring high speed control or signal transmission, inverter control equipment and pre-drive buffers for driving transistors as well as facility management equipment such as abnormal current and gas detectors.
It is in mass production now.
Rohm Semiconductor develops and manufactures a large product range from low power microcontrollers, power management, standard ICs, SiC diodes, MOSFETs and modules, power transistors and diodes, LEDs to passives components such as resistors, tantalum capacitors and LED display units, thermal print heads.
Production takes place in manufacturing plants in Japan, Korea, Malaysia, Thailand, the Philippines and China.
Rohm Semiconductor Europe’s head office is near Dusseldorf, Germany.
Lapis Semiconductor (former OKI Semiconductor), SiCrystal and Kionix are companies in the Rohm Semiconductor Group.
