Akustica’s newest microphones once again demonstrate the advantage of combining in-house MEMS, ASIC, and package design with in-house fabrication facilities. The microphones are the first to make use of new ASIC design elements that optimize performance depending on the target market. The two new microphones are also the first to be built using a new MEMS architecture and fabrication process which includes additional material layers and optimized thicknesses of current layers. And, the AKU151 is the world’s first microphone to use an advanced, metal-lid, direct-port package.

The final performance of a MEMS microphone depends not only on how each component of the design performs independently, but also on how all pieces interact and perform together as a microphone system. In particular, high performance MEMS microphone design requires outstanding modeling capabilities, broad system understanding, and tight control of all aspects of design and fabrication. The combination of these competencies is what results in superior microphones that exceed customer requirements for acoustic performance and robustness.

Akustica/Bosch is the world’s only MEMS microphone supplier with all of these proficiencies under one roof, thereby enabling the type of industry-leading technical innovation that has been demonstrated by Akustica’s recent introductions of its first and second generation HD microphone families, and again with the introduction of the AKU151 and AKU350.

The AKU151, in its tiny 5.4mm3 package, presents consumer device manufacturers with a durable, RF-immune microphone in the top-port configuration that is easiest for use in their high volume assembly lines. Unlike other microphones where a smaller package typically results in lower performance, the AKU151 delivers a high SNR of 65dB, meaning that the AKU151 delivers almost twice the acoustic performance density (SNR/mm3) of any other top-port MEMS microphone. The AKU151 is also optimized for low power applications, consuming only 60µA during standard, full-performance operation, making it ideal for use in applications like wearables which require small, high performance microphones but have limited battery life.

The AKU350 is a robust, bottom-port, metal-lid, 9.1mm3 microphone with a single-ended output that provides an outstanding 67dB SNR and a tight +/-1dB sensitivity matching. With its high SNR and accompanying microphone-to-microphone uniformity, the AKU350 is optimized to meet the needs of smartphone manufacturers who use multiple microphones with noise cancellation algorithms. These algorithms rely on well-matched, high-performance microphones to deliver superior noise suppression and speech recognition accuracy to the end user.

Higher accuracy microphones can significantly improve the quality of sound recordings made with mobile devices. This is particularly evident when one is making a recording of a quiet or distant sound whose signal level approaches the inherent noise level of the microphone. As Akustica recently demonstrated at the Consumer Electronics Show in Las Vegas, making a recording using a microphone such as the AKU350 - with a higher SNR than a typical smartphone MEMS microphone - can eliminate the hiss that can often be heard in recording playback, resulting in a crisper, more realistic sound.

“Akustica’s customers continue to benefit from the unique combination of experienced designers and industry-leading facilities that we have at our disposal as part of the Bosch Group,” said Horst Muenzel, CEO and General Manager, Akustica.

“Nobody else in the world has the capabilities that we have. This is what allows us to uniquely respond to our customer’s needs and to deliver new, innovative microphones with higher performance, more uniformity, greater robustness, and smaller footprints.”