NXP Smart Sensing Amplifier Turns Smartphone Speaker Into Microphone, Vibration Sensor with Superior Audio Performance

Press Release overview

KEYWORDS:NXP Semiconductors,TFA9911，The features of TFA9911，Target Applications,Freescale Semiconductor

Title:NXP New TFA9911 Smart Sensing Amplifier Turns Smartphone Speaker Into Microphone, Vibration Sensor with Superior Audio Performance

NXP Semiconductors recently introduced a new smart sensing amplifier, TFA9911, featuring a high efficiency class-D audio amplifier, sophisticated speaker boost and protection, and combining speaker sensing and processing algorithms to optimize recording and calling experiences. The device transforms speaker into a microphone and features vibration detection, which enables development of new “tap” activating use cases for smartphones.
. Designed to make smartphones smarter, the new amplifier features a high efficiency class-D audio amplifier, sophisticated speaker boost and protection, and combines speaker sensing and processing algorithms to optimize recording and calling experiences.The new amplifier provides smartphones with superior audio performance in noisy environments such as concerts or sporting events and enables loud and clear playback without saturating or distorting the sound. The new NXP device utilizes its speakers as microphones to improve the smartphone’s recording quality. Also, the amplifier equips smartphones with a vibration sensor for reliable “tap” detection on both sides of the phone, for example users can tap their finger on the back of the phone to take a “selfie” with a single hand.

The description of the TFA9911

The TFA9911 is a high efficiency class-D audio amplifier with a sophisticated speaker boost and protection algorithm. It can deliver 7.2 W peak output power into an 8Ohm speaker at a supply voltage of 3.6 V. The internal boost converter raises the supply voltage to 9.5 V, providing ample headroom for major improvements in sound quality.
The TFA9911 is the combination of a high efficiency class-D audio amplifier with a sophisticated speaker boost and protection algorithm, and state-of-the-art audio processing software for noise suppression and audio zooming. It can deliver 7.2 W peak output power into an 8 Ω speaker at a supply voltage of 3.6 V. The internal boost converter raises the supply voltage to 9.5 V, providing ample headroom for major improvements in sound quality.
With the new speaker-as-microphone solution, the TFA9911 will offer great audio recording quality and reducing wind-noise when talking. It also has tap sensing on the speaker which allows you to tap anywhere on the phone to take selfie or any other feather.

According to NXP, unlike competing solutions, the adaptive sound maximizer algorithm uses feedback to accurately calculate both the temperature and the excursion, allowing the TFA9911 to adapt to changes in the acoustic environment. Also, internal intelligent DC-to-DC conversion boosts the supply rail to provide additional headroom and power output. The supply voltage is only raised when necessary. This maximizes the output power of the class-D audio amplifier while limiting quiescent power consumption.
The features of TFA9911

Boost Voltage – 9.5V
Output power: 3.6 W (RMS) into 8 Ohm at 3.6 V supply voltage (THD = 1 %)
I2C-bus control interface (400 kHz)
High efficiency and low power dissipation
Sample frequencies from 8 kHz to 48 kHz supported in I2S mode and 16 kHz to 48 kHz in PDM mode
3 bit clock/word select ratios supported (32x, 48x, 64x) in I2S mode
Bit clock speed from 2.048MHz up to 6.144 MHz in PDM mode

Summary

• Smart Amplifier – New speaker protection algorithms increase loudness while maintaining the audio quality at speaker limit capability.
• Speaker-as-a-Microphone (SaM) – using earpiece or back speaker as additional microphones for excellent performance in loud and windy environments.
• Speaker-as-a-Vibration-Sensor (SaV) – using speaker as vibration sensor for tap detection.

Target Applications

Mobile phones
Tablet computers
Portable gaming devices
Portable audio players

About Freescale Semiconductor
Freescale Semiconductor, Inc. was an American multinational corporation headquartered in Austin, Texas with design, research and development, manufacturing and sales operations in more than 75 locations in 19 countries. The company employed 17,000 people worldwide.

It has more than 20,000 in more than 20 countries with the revenue of $5.2 bilion USD in 2008 while having more than 10,000 customers including 100 of the world's top OEMs like BMW, Whirlpool,Datang, Dolby, Logitech, Electrolux, Toshiba, Motorola and Pioneer.

Freescale is famous for the reputation of integrity and honesty which is a source of competitive advantage. Freescale's Code of Business guides every employee, officer and director to carry out the workThe key values of the company is " Act With Integrity, Communicate Openly and Honestly, and Treat Everyone With Respect and Fairness" and it is also work hard to be the most ethical company in the business. 

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