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Comparators excel through high noise immunity

New Products |
By Christoph Hammerschmidt

Advances in computerization and higher component densities have led to increased electromagnetic noise in electric vehicles and cars equipped with Advanced Driver Assistance Systems (ADAS). However, the evaluation of the noise behavior of individual boards and systems and the implementation of noise reduction measures are not possible in isolation during the development phase. The evaluation and implementation of the measures must take place after the entire vehicle has been manufactured. This makes optimization against noise a very lengthy and costly process that often requires several repetitions.

In response, Rohm developed 2017 operational amplifiers using EMARMOUR technology. This technology is not only characterized by a high noise insensitivity, it also reduces the design resources for noise reduction measures. The operational amplifiers were well received by automotive manufacturers. In order to meet market requirements even better, Rohm is now presenting the first comparators based on EMARMOUR technology.

EMARMOUR is the brand name for Rohm products developed using proprietary technologies covering chip layout, processes and circuit design. This technology achieves extremely high noise suppression during ISO11452-2 testing, limiting output voltage fluctuations to ±1% across the entire noise frequency band. This high noise suppression not only reduces development resources and time, but also improves reliability by solving noise issues in automotive on-board system development.


Main features are high noise immunity, the saving of external components and the support of worldwide standards for automotive electronics.

Unlike conventional products whose output voltage can fluctuate up to ±20%, the BA8290xYxxx-C series limits output voltage fluctuations to ±1% due to its outstanding noise immunity. This reduces both design resources and the time required to characterize noise and implement measures that play an important role in vehicle system design. At the same time, reliability is improved.

The high noise immunity eliminates the need for external components used in conventional noise reduction measures (CR filters for power supply, input and output pins). In a four-channel comparator, for example, the new products require 28 components less than conventional solutions.

The BA8290xYxxx-C series is qualified for automotive applications according to the AEC-Q100 standard. A wide range of SMD packages and channel counts with standard comparator pin assignment is available. For applications sensitive to noise, the new comparator series allows easy replacement of existing products.

More information: BA8290xYxxx-C Series


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