February 15, 2012 – Analog Devices ( www.analog.com ), a global leader in data converters for signal processing and high-performance semiconductors, today introduced the high-performance ADMP504, featuring a MEMS microphone that delivers the industry's lowest noise characteristics. Achieving a Signal-to-Noise Ratio (SNR) of 65 dBA and an Equivalent Input Noise (EIN) of 29 dBA, the ADMP504 boasts SNR performance equivalent to connecting two microphones with 62 dB SNR capabilities. Additionally, the ADMP504 features a frequency response extended up to 20 kHz and a high Power-Supply-Rejection (PSR) of 70 dBV. Based on these capabilities, the ADMP504 addresses the demanding requirements of many industrial applications, as well as professional audio and video conferencing applications. The new microphone utilizes ADI's patented MEMS technology and audio signal processing expertise and is supplied in a 3.35mm × 2.50mm × 0.88mm surface mount package.

According to market research firm IHS, global MEMS microphone shipments increased to 1.3 billion units in 2011, an 82% increase compared to 704 million units in 2010, which is attributed primarily to the increased demand for handset integration.

"ADI's high-performance MEMS microphones have enjoyed steady market popularity in sectors such as smartphones and media tablets since their initial launch in 2008," said Jérémie Bouchaud, Senior Analyst and Head of MEMS and Sensors at IHS. "With this further performance enhancement, we have laid the groundwork for enabling a diverse range of new and innovative applications in other markets, such as industrial equipment monitoring and building security."

ADMP504 MEMS Microphone
The ADMP504 is a surface-mount MEMS microphone that maintains compatibility with reflow solder without affecting sensitivity. With excellent sensitivity of -38dBV, it is suitable for many codecs and discrete signal chain components. Additionally, based on a high SNR of 65dBA (or 29dBA EIN), it enables applications using multi-microphone beamforming algorithms as well as far-field audio capture applications. In addition, when the power supply voltage is 1.6V to 3.3V, the current consumption is lowered to less than 180μA (average), which can extend the battery life of portable applications.

Key Specifications and Benefits of the ADMP504 MEMS Microphone
• Achieves excellent sound quality in HD applications with an SNR of 65 dBA (or 29 dBA EIN).
• Balanced and natural sound reproduction with frequency response performance extended up to 20kHz
• Achieves excellent RF and electrical noise rejection ratios with a high PSR of 70dBV, providing exceptional design flexibility for microphone placement and power trace routing.
• Delivers excellent performance in many codecs and discrete signal chain components based on a sensitivity specification of -38dBV