In recent years, advancements in electrification and mounting density have increased the amount of environmental noise in electric vehicles and cars equipped with ADAS. Generally, however, it is extremely difficult to carry out noise evaluation on individual boards and systems during automotive development since it must be performed after assembly. What’s more, some results require improvements such as large-scale EMI countermeasures to lower noise.
In response, ROHM released the EMARMOUR™ series in 2017 that have since been well received in the automotive and industrial markets due to their superior noise immunity that reduces design resources by combining a vertically integrated production system with proprietary analog design technology.
The EMARMOUR™ series is designed to prevent malfunctions due to noise without the need to take special application measures. The latest BD8758xY series in particular has demonstrated superior performance under four international noise evaluation tests. For example, 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 (one-thirty lower). 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.

‘ROHM Real Model’ is a new high accuracy SPICE model that utilizes original model-based technology to faithfully reproduce the electrical and temperature characteristics of the actual IC, resulting in a perfect match between the IC and simulation values. This ensures reliable verification, contributing to more efficient application development – for example by preventing rework after prototyping.

This SPICE model is now available on ROHM’s website.
https://www.rohm.com/products/amplifiers-and-linear/operational-amplifiers/standard/emi-automotive-input-output-rail-to-rail

The BD7750x series is the industry’s first op amp that not only supports high-speed amplification (high slew rate: 10V/us) required in anomaly detection and other systems, but also completely eliminates oscillation caused by load capacitance (i.e. wiring). Unlike conventional high-speed op amps that can become unstable due to load-capacitance-induced oscillation, ROHM’s new product ensures stable operation with no unwanted oscillation. In addition, whereas the output voltage for conventional products can fluctuate by ±200mV or more across the entire noise frequency band, the BD7750x series provides unprecedented EMI Immunity (noise immunity) that limits variation to less than ±20mV (1/10th).
This enables high-speed signal amplification without being affected by load capacitance or external noise when installed in the latter stages of sensor applications, improving reliability and reducing design time.

「The BD7750x series utilizes original Nano Cap™ power supply technology to achieve extremely stable control, making it the industry’s first op amp that completely eliminates oscillation induced by load capacitance (i.e. wiring) while supporting high-speed amplification (high slew rate: 10V/us) required in anomaly detection and other systems.
Unlike conventional op amps that can be difficult to use due to restrictions imposed on the wiring and peripheral components resulting from instability caused by load capacitance, ROHM’s new op amp eliminates oscillation to ensure stable operation and facilitate application design.

Whereas the output voltage of conventional products can fluctuate by ±200mV or more across the entire noise frequency band, ROHM’s latest EMARMOUR™ series op amp achieves unprecedented noise immunity that limits variation to less than ±20mV. This eliminates the need for countermeasures (filter circuits) for each noise frequency, reducing the noise design resources for sensors (which play an important role in a variety of systems) facilitating application design while improving system reliability.

The BD7750x series provides superior noise immunity that eliminates the need for external noise countermeasure components conventionally required for standard products (i.e. RC filters for the power supply, input, and output pins). For example, in the case of a 1ch op amp, ROHM’s new product uses 10 fewer external components than conventional solutions.

In contrast to conventional products whose output voltage can fluctuate up to ±20%, the BA8290xYxx-C series utilizes superior noise tolerance to limit output voltage fluctuation to within ±1%, preventing malfunctions. This enables reduction of design resources and time for noise characterization and measure implementation that plays an important role in automotive systems design while improving reliability.

In contrast to conventional products whose output voltage can fluctuate up to ±20%, the BA8290xYxx-C series utilizes superior noise tolerance to limit output voltage fluctuation to within ±1%, preventing malfunctions. This enables reduction of design resources and time for noise characterization and measure implementation that plays an important role in automotive systems design while improving reliability.

Superior noise tolerance eliminates the need for external components used in noise countermeasures (CR filters for the power supply, input, and output pins) used with conventional products. For example, in the case of a 4ch comparator, ROHM’s new products require 28 fewer components than conventional solutions.