New-Tech Europe Magazine | August 2017

new products

Infineon introduces packaged MEMS microphones with a 70 dB signal-to-noise ratio Infineon Technologies AG (FSE: IFX / OTCQX: IFNNY) is entering the packaged silicon microphone market. With this it is addressing the needs for high performance, low noise MEMS microphones. The analog and digital microphones are based on Infineon’s dual backplate MEMS technology and distinguish themselves with a 70 dB signal-to-noise ratio (SNR). This is combined with an exceptionally low distortion level of 10 percent at a 135 dB sound pressure level (SPL). In a 4 mm x 3 mm x 1.2 mm MEMS package, the microphones are very well suited for high-quality acoustic recordings and far field voice capturing applications. “This is an expansion of the established high volume bare die MEMS and ASIC business model with our packaging partners around the world,” said Dr. Roland Helm, Senior Director and Head of Product Line Sensors for Infineon’s Power Management and Multimarket Division. “We will continue to strengthen and grow our business with our partners with bare dies; additionally we now address low noise high-end use cases with our two new packaged microphones.” Current MEMS microphone technology uses a sound wave actuated membrane and a static backplate. Infineon’s dual backplate MEMS technology uses a membrane embedded within two backplates thus generating a truly differential signal. This allows improved high frequency immunity for better audio signal processing and increases the acoustic overload point of 10 percent Total Harmonic Distortion (THD) to 135 dB SPL. The SNR of 70 dB is an improvement of 6 dB compared to a conventional MEMS microphone. This improvement is equivalent to doubling the distance from which a user can give a voice command that is captured by the microphone. Additionally, the analog and digital microphones have excellent microphone-to-microphone matching (±1 dB sensitivity matching and ± 2° phase matching) which is ideal for implementing in arrays. For this reason the MEMS microphones are a perfect fit for ultra-precise beam forming and noise cancelling

20V, 20A Monolithic Synchronous Silent Switcher®2 Buck Regulator Reduces EMI & Enables High Power Density Applications Analog Devices, Inc., which recently acquired Linear Technology Corporation, announces the LTC7150S, a 20V, 20A monolithic synchronous buck converter with differential VOUT remote sensing. The device’s unique phase lockable controlled on-time constant frequency current mode architecture eases compensation and is ideal for high step-down ratio applications that operate at high frequencies while demanding fast transient response. The LTC7150S uses Silent Switcher®2 technology, including integrated bypass capacitors to deliver a highly efficient solution with excellent EMI performance while easing layout constraints. Multiphase operation with up to 12 phases provides the capability to directly parallel multiple devices for higher current with minimal increase in input and output capacitance. VOUT remote sense ensures that voltage regulation at the load is accurate regardless of load current or board layout. The LTC7150S’s wide 3.1V to 20V input range supports a wide variety of applications, including most intermediate bus voltages, and is compatible with many battery types. Integrated N-channel MOSFETs deliver continuous load currents as high as 20A with minimal thermal derating, at output voltages ranging from 0.6V to VIN, ideal for point- of-load applications such as powering high current/low voltage DSPs, FPGAs and ASICs. Other applications include telecom/datacom systems, distributed power architectures and general high power density systems. The LTC7150S’s very low 25ns minimum on-time allows for a high step-down ratio power supply at high frequencies supporting both forced continuous and discontinuous mode operation. The operating frequency is selectable from 400kHz to 3MHz and can be synchronized to an external clock. The LTC7150S’s total differential output voltage accuracy is ±1% over the –40°C to 125°C operating junction temperature range. Additional features include differential remote VOUT sensing directly at the load, PHMODE phase selector pin, accurate 1.2V RUN pin threshold, VIN overvoltage protection, power good and programmable soft-start/ tracking.

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