Why I2S Digital Power Amplifier IC Will Become a Trend
Time:2022-11-14
Views:1562
In recent years, more and more audio manufacturers choose to switch from analog input power amplifier to I2S digital power amplifier. For example, Harman and other audio products, high-performance Soundbar products, large screen TV, conference audio, smart home, etc. The reason why engineers are more and more inclined to use digital power amplifiers is also due to the technical advantages of digital power amplifiers. For example, the I2S power amplifier has the advantages of anti-interference, simple wiring requirements, ultra-low bottom noise, buffer time for signal processing, flexible signal processing and other obvious advantages, which allow engineers to play more roles and greatly shorten the development cycle of the case. In addition, many of the current digital power amplifiers integrate rich DSP. The digital power amplifier integrates a wealth of algorithms, making frequency division very simple. It can also make up for the shortage of the speaker cavity through EQ adjustment, prevent sound breaking through DRC, and use a variety of tools such as mixing, vocal enhancement, bass enhancement, etc.
NS4168 is a 2.5W mono class D audio power amplifier that supports I2S digital audio signal input and has anti distortion function. The NS4168 is particularly suitable for environments that are sensitive to power consumption and generate interference. Such as Bluetooth audio, WiFi audio, tablet computers, etc.
In these application environments, system noise can destroy small analog signals sent to the amplifier, while I2S standard is sent to the audio amplifier in a digital way, thus significantly reducing the impact of noise sources on the transmitted audio. In addition, it also avoids the noise caused by the audio decoding DAC built in the MCU main control chip, and finally achieves a higher signal-to-noise ratio and less distortion. Without the use of input coupling capacitor, the turning point of the internal input high pass filter is selected to match different loudspeakers by detecting a line pulse through the CTRL pin. PCB wiring does not need to carefully consider the layout and routing of the audio power amplifier. The periphery is simpler and the debugging is more convenient.
Many engineers will think that analog power amplifier is more powerful than digital power amplifier. In fact, it may be more an asymmetric comparison. The power has nothing to do with analog or digital input, but more to do with Rds on and packaging.
The application of TI in digital power amplifier is relatively extensive. The classic TAS57XX series of the previous generation, and the current main TAS58XX series, can meet most of the applications that pursue cost performance.
The TAS5805 is a better choice in the medium power range. It has basic tools and has won market recognition. However, under the current market of shared demand and TI‘s focus on supporting international customers, many domestic customers are injured. For injured customers, you can try ACM8625 launched by Suzhou Zhisheng Semiconductor. The performance is not discounted. What is valuable is that it has a lot of practical innovation, which meets the requirements of localization.
NS4168 is a 2.5W mono class D audio power amplifier that supports I2S digital audio signal input and has anti distortion function. The NS4168 is particularly suitable for environments that are sensitive to power consumption and generate interference. Such as Bluetooth audio, WiFi audio, tablet computers, etc.
In these application environments, system noise can destroy small analog signals sent to the amplifier, while I2S standard is sent to the audio amplifier in a digital way, thus significantly reducing the impact of noise sources on the transmitted audio. In addition, it also avoids the noise caused by the audio decoding DAC built in the MCU main control chip, and finally achieves a higher signal-to-noise ratio and less distortion. Without the use of input coupling capacitor, the turning point of the internal input high pass filter is selected to match different loudspeakers by detecting a line pulse through the CTRL pin. PCB wiring does not need to carefully consider the layout and routing of the audio power amplifier. The periphery is simpler and the debugging is more convenient.
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