21ic News NXP Semiconductors NXP Semiconductors NV's revolutionary embedded algorithm in the new audio system can increase the output power of micro-speakers by more than 5 times, which greatly improves the sound quality of mobile devices. The NXP TFA9887 IC delivers over 2.6 W RMS of power to micro-speakers (previously limited to 0.5 W), bringing higher volume, richer bass and better sound to mobile phones, portable music players and tablets. Sound quality - and there is no risk of damage to the speakers. The TFA9887 integrates safety features such as amplitude control and real-time temperature protection, and monitors the speaker through a current-sense amplifier that works safely even at near-peak output.
Shawn Scarlett, director of marketing for NXP's mobile audio product line, said: "Digital natives have grown older and have become accustomed to the unsatisfactory sound quality of mobile devices. As speakers get smaller, they need to be good on mobile devices. Sound is becoming more and more challenging. Our new audio system will revolutionize the listening experience, bringing more loud and rich sound quality to most mobile devices. The sound quality is huge, consumers, mobile phone manufacturers and operators. It's easy to hear the difference."
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Manufacturers who do not need to compress low-frequency bandwidth must make trade-offs between good sound quality, small size, and reliability. As micro-speakers continue to shrink, designers of mobile phones, media players and tablets have to limit output power and sound quality. At a certain frequency, the amplifier is likely to output too much power, causing damage to the speaker, while at other frequencies, there may be problems with insufficient output power. Until now, system designers have been unable to determine when additional power should be applied. Therefore, the usual practice is to remove the bass frequency, limit the output power to avoid speaker damage, and speaker damage is one of the common faults in mobile devices.
By integrating circuitry for monitoring speaker performance and preventing damage, the NXP TFA9887 IC allows designers to break the routine. The adaptive amplitude control measures the actual displacement of the loudspeaker diaphragm to ensure it does not exceed the rated limits. Real-time temperature protection directly measures the voice coil temperature to prevent thermal damage.
Improved audio performance Thanks to the full protection of the speakers, the system can generate extra power and make the sound louder and more pleasing. The TFA9887 optimizes the audio signal based on the motion of the speaker, which is not possible with other systems, so that the full potential of the speaker is fully utilized without exceeding the limits. An advanced anti-breaking algorithm monitors audio performance and avoids clipping, even when the power battery begins to drop. The bandwidth extension feature will greatly increase the low frequency response of the speaker. In addition, the intelligent DC-DC boost converter maximizes output power at any level and is immune to battery undervoltage. The TFA9887 automatically adapts to any changes in the speaker – including aging, damage to the housing, and blockage of the speaker outlet – to help optimize performance and maintain the desired sound quality.
The entire system is integrated into a single chip and is equipped with a digital interface to support portable devices. The IC integrates the NXP CoolFlux audio DSP, an efficient Class D amplifier with current sensing, and a DC-DC boost converter. Advanced embedded algorithms do not require additional licenses. With the included design tools, designers can customize the sound quality and choose the way to optimize the performance of their mobile devices.
Time to market
Samples and samples of the TFA9887 will be available soon.
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