Op amps boost EMI performance of automotive designs

Op amps boost EMI performance of automotive designs

New Products |
By Nick Flaherty

Rohm has launched two op amps with improved EMI immunity for automotive designs. The BD87581YG-C and BD87582YFVM-C are rail-to-rail input/output high-speed CMOS op amps with an input range from 4 to 14V and slew rate of 3.5V/µs.

The single and dual channel op amps are suitable for vehicle engine control units and anomaly detection systems for factory automation equipment. These are part of the EmArmour series, launched in 2017, that is intended to prevent malfunctions due to EMI noise without the need to take special application measures. The latest BD8758xY series in particular has demonstrated improved EMI performance under four international noise evaluation tests.

In ISO 11452-2 radio wave emission testing conducted by vehicle manufacturers, the output voltage of standard products fluctuates by more than ±300mV in all frequency bands, while the new BD8758xY series achieves ±10mV or less. At the same time, the CMOS element structure enables accurate, high-speed signal amplification without being affected by external noise when installed inside the targeted sensor applications. This significantly improves reliability while reducing design production-hours in a wide range of applications, including anomaly detection systems.

The parts are aimed at industrial factory automation equipment, measurement equipment, measuring instruments, servo systems and sensor systems as well as EV/HEV inverters, engine control units, eCall (vehicle emergency call system) and car navigation/air conditioning systems.

Rohm has also developed a high accuracy SPICE model that matches the electrical and temperature characteristics of the actual IC and simulation values to prevent rework after prototyping.

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