英飞凌的小型MEMS麦克风，具有出色的信噪比和520a功率Small MEMS Microphone from Infineon with Excellent SNR and 520 A Power

英飞凌凭借其独有的MEMS技术和巧妙的ASIC设计，将高音频质量和低功耗结合在一个微型麦克风设备中。Infineon combines outstanding audio quality and low lower in a compact microphone device using its own MEMS technology and intelligent ASIC architecture.

如今，耳机和以音频为中心的可穿戴设备的用户对音质和电池寿命有着很高的期望。工程师必须与时俱进，利用先进的MEMS技术和创新的电路设计。为了满足这一需求，英飞凌科技最近宣布推出XENSIV MEMS麦克风产品线的新成员。据该公司介绍，这款麦克风被称为IM69D128S，是一款PDM(脉冲密度调制)设备，旨在满足需要高信噪比(SNR)、低麦克风自噪声、长电池寿命和高可靠性的混合应用。Today's users of earpieces and audio-centric wearables have high expectations for sound quality and battery life.  Engineers must keep up with The Times and utilize advanced MEMS technology and innovative circuit design. To meet this demand, Infineon Technologies recently announced the launch of new members of its XENSIV MEMS microphone product line.  Known as IM69D128S, the microphone is a PDM (pulse density modulation) device designed to meet applications that require a mix of high signal-to-noise ratio (SNR), low microphone self-noise, long battery life and high reliability, according to the company.

The XENSIV IM69D128S MEMS microphone is made up of a MEMS unit and an ASIC housed in a tiny module packaging. 

XENSIV IM69D128S MEMS麦克风由一个微型模块封装的MEMS单元和ASIC组成。

专注于尺寸、功率和性能Focus on Size, Power, and Performance

根据Tyshchenko的说法，如今推动MEMS麦克风的重要技术趋势是小型化、降低功耗和提高性能。小型化是必要的，以使这些设备能够适应现有应用中的更多传感器。 Following Tyshchenko, the key technological trends driving MEMS microphones today are downsizing, reduced power consumption, and improved performance. Miniaturization is required to allow these devices to coexist with more sensors in existing applications.

她说，为了延长依赖电池的无线产品的使用寿命，需要降低功耗。同时，性能方面适用于多个应用程序空间。Tyshchenko说道:“性能的提升意味着消费者对工作室质量的期望。“我们还在探索医疗和工业领域的新用例。”Reduced power consumption is needed to prolong the life of battery-dependent, wireless products, she says. Meanwhile, the performance aspect applies to multiple application spaces.  "Increased performance means studio quality sound expectations for the consumer domain,” says Tyshchenko.  "There's also exploration of new use cases in medical and industrial branches."

考虑到这一切，Tyshchenko指出在520 μA的功耗和69 dB(A)的信噪比下，IM69D128S的数字麦克风ASIC提供了该公司声称的最高性能，几乎是平均所需功耗的一半。With all of this in mind, Tyshchenko states that the IM69D128S's digital microphone ASIC gives the maximum performance at nearly half the typical needed power consumption, at 520 A of power consumption and an SNR of 69 dB(A).

在新一代英飞凌MEMS麦克风提供的新方面中，Tyshchenko将其称为“麦克风级的无缝电源开关”。这意味着它提供了开关电源模式，没有任何可听到的伪影。Among the unique features of this new generation of Infineon MEMS microphones is "seamless power switching on microphone level," according to Tyshchenko. That is, it provides switching power modes with no audible distortions.

密封双膜MEMS技术Sealed Dual Membrane MEMS Technology

IM69D128S的MEMS部分采用英飞凌最新的专利密封双膜MEMS技术制造。Tyshchenko说SDM方法使用两个膜和一个带电的定子来创建一个密封的低压腔和一个差分输出信号。她说:“这种架构可以实现超高信噪比，非常低的失真，并在麦克风级别上实现高入口保护(IP57)，防止水和灰尘。”

The IM69D128S's MEMS are built with Infineon's latest proprietary sealed dual membrane MEMS technology. According to Tyshchenko, the SDM technique creates a sealed low-pressure hollow and a differential output signal by combining two membranes and a charged stator. "The architecture enables ultra-high SNR, very low distortions, and enables high ingress protection (IP57) against water and dust at a microphone level," she says.

M69D128S uses Infineon’s proprietary sealed dual membrane MEMS technology. It employs two membranes and a charged stator to create a sealed low-pressure cavity and a differential output signal.M69D128S采用英飞凌专有的密封双膜MEMS技术。它采用两个膜和一个带电定子来创建一个密封的低压腔和一个差分输出信号。

This MEMS architecture is also what allows high performance in a small package while the IM69D128S’s ASIC provides reduced power consumption and seamless switching functionality.这种MEMS架构也允许在小封装中实现高性能，而IM69D128S的ASIC提供了更低的功耗和无缝切换功能。

Tyshchenko在谈到ASIC的更多细节时表示，数字ASIC ICD82是IM69D128S设计的核心。集成电路嵌入充电泵，用于给定子充电。MEMS单元和ASIC之间的差分连接通过PGA(可编程增益放大器)实现，该放大器放大来自两个膜的差分信号。Tyshchenko说:“这些信号被转发到功率优化的4位sigma-delta ADC。Tyshchenko elaborates on the ASIC, stating that the digital ASIC ICD82 lies at the heart of the IM69D128S architecture.  The IC incorporates a charge pump, which is used to charge the stator.  A PGA (programmable gain amplifier) amplifies differential signals from two membranes to provide differential communication between the MEMS unit and the ASIC. “Those signals are forwarded to the power-optimized 4-bit sigma-delta ADC,” says Tyshchenko.

"模拟和数字部分有双电源电压，这使我们能够降低功耗和噪音。"

'There are dual supply voltages—for the analog and digital parts—which is what allows us to reduce power consumption and noise.'

数字专用集成电路ICD82是IM69D128S设计的核心。其架构在保持低功耗的同时实现了高信噪比。The digital ASIC ICD82 is the heart of the IM69D128S’s design. Its architecture achieves high SNR while keeping power consumption low.

电源模式检测器由时钟控制，而标志引脚用于在不同的电源模式之间切换。更多信息请参见IM69D128S数据表。The clock drives a power mode detector, and the flag pin toggles between several power modes. More information is available in the IM69D128S data sheet.

根据Tyshchenko的说法，这种设计使功耗降低了1 / 2，同时仍然实现了高信噪比值——所有这些都包含在同一个模块化IC单元中。According to Tyshchenko, this solution reduces power consumption by a factor of two while maintaining high SNR values—all contained within the same modular IC unit.

适合IM69D128S的听觉设备包括真正的无线耳塞、耳上耳机和听力增强。但据该公司称，它也可以应用于其他空间关键应用，如可穿戴设备、智能手机和物联网设备。True wireless earbuds, over-ear headsets, and hearing enhancement are all suitable for the IM69D128S. According to the corporation, it might potentially be used in other space-critical applications such as wearables, smartphones, and IoT devices.

All images used courtesy of Infineon Technologies

Sources of information are All about circuits

所有图片均由英飞凌科技提供

信息来源All about circuits