NXP Smart Audio Mobile Audio Solution

First, Smart Audio technology summary:

With the rise of smart phones, the thinner, smarter and more power-saving mobile phones have restricted the continuous development of mobile phone speakers, which has brought great challenges to the improvement of the sound quality of mobile phones. A music feast on a smartphone is undoubtedly a luxury, and the introduction of the Smart Audio audio solution from NXP Semiconductors has revolutionized our perception and a real revolution. The revolutionary embedded algorithm in NXP's new audio system can increase the output power of micro-speakers by more than 5 times, greatly improving the sound quality of mobile devices.

Second, Smart Audio technology chip introduction:

Pinja's current NXP TFA9887/TFA9890 IC delivers more than 2.6 W RMS of power to micro-speakers (previously limited to 0.5 W), bringing higher volume to mobile phones, portable music players and tablets. Thick bass and better 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.

TFA9887/TFA9890 interface selection ensures easy integration with handset manufacturers

●I2S

●I2C

Advantages of TFA9887/TFA9890:

● embedded processor

●Class D--amplifier

● Integrated current check

● Very Small SoluTIon.

Third, the realization mechanism of TFA9887:

TFA9887 hardware circuit block diagram:

NXP real-time monitoring speaker working status

●Trumpet temperature

●Film offset

●Amplifier cutting

Real-time status usage:

●protect the speaker

● Optimize audio features

The role of Class D--amplifier:

● Current check feedback system

●CoolFlux Audio DSP

Adaptive speaker mode:

According to the acoustic environment adaptive mode, the following types are supported:

●Closed sound chamber

●Reflective sound chamber

●Open speaker

Boost circuit provides more energy for problems with low battery voltage

Since the Smart PA is a chip that integrates a DC/DC boost circuit, a CLASS-D amplifier, and a smart speaker protection function, the connection to the circuit diagram, the selection of the peripheral components of the chip, and the layout and layout of the PCB must meet the requirements to achieve better performance. .

Four: Software debugging:

In order to achieve the desired results, Smart Audio PA has an important part in addition to layout and hardware design and speaker consistency. Tuning. At the same time, this link is also the most difficult part.

Tuning Tools:

The Pico GUI interface is as follows:

The process structure diagram is as follows:

Decibel tester test:

Conclusion

The main application products of this program are smart phones and tablet computers. Currently, mainstream mobile phone manufacturers are adopting them. There are many functional applications on MTK, Qualcomm and other platforms. With the popularization of this program, the sound output of smart phones and tablet computers will be revolutionized.

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