Introduction to High-Fidelity Audio Amplifier Chip

Digital amplifiers are the mainstream of audio amplifier development. High-fidelity audio amplifier chips need to sample and convert the sound source to obtain digital signals for amplification. High-fidelity audio amplifier chips have high design requirements and are difficult to produce. The main types of integrated high-fidelity amplifier chips have a typical product development path. In fact, different product paths mean various product advantages. The Korean NF series audio amplifier chips represented by Gongcai.com all have high-fidelity, high-performance fully digital PWM modulators and two high-power full-bridge MOSFET power stages.

NF Company of South Korea has been established for 20 years. For many years, it has been focusing on the independent research and development of digital audio chips. It has a group of global high-end IC design experts and sound algorithm experts. Its product brand has a high degree of recognition among the older generation of engineers and has always been favored by local Korean companies Samsung and LG; nearly 80% of Samsung and LG's audio and video electronic products use Korean NF's chip products and are sold worldwide. The Korean NF series represented by Gongcai.com; the performance specifications (DSP) of the digital power amplifier chip - NTP8835 have noise reduction technology, 3D surround, ASRC and other functions; from the practical application point of view, it has a powerful core DSP. The internal pre-stage adopts a constant voltage source bias, which can better stabilize the working state of the output stage. The chip is equipped with a perfect protection link. The extremely wide power band and extremely high conversion rate make the sound warm, soft and more durable. Not only does it retain a good low-frequency strength and depth, but the elasticity and high-frequency resolution of the amplifier are significantly improved. The sampling rate can be met from 8K to 192KHz (specific models).

◆One stereo output (2.0CH), one single channel output (0.1CH);

◆In terms of power, it can reach an output of 2*30W + 60W, with a total power of 120W; sufficient margin;

In addition, NTP8835 has different DSP sound effects:

◆3D surround sound based on patented technology, as if you are in the scene;

◆Ultra-low noise in DBTL mode; 3D surround

◆Excellent heat dissipation performance with low output impedance;

◆Protection circuit: OCP (overcurrent protection), OTP (over temperature protection), UVP (undervoltage protection)

◆Asynchronous sample rate conversion, DC reduction filter

◆Wide operating power supply voltage range (7V ~ 28V)

The high-fidelity audio amplifier chip NTP8835 has a power output increased to 2x30W, and has added the ASRC (asynchronous sampling rate conversion) function, so that the sampling frequency of the input IIS can be freely and indiscriminately changed from 8kHz to 192kHz to cope with the design of different circuit schemes. In addition to the conventional 2.0CH (BTL) and 0.1CH (PBTL) designs, it can also achieve 2.1CH (2xSE+1xBTL) output design. All functions can be controlled through the I2C host interface through the internal register value bus.

The high frequency of NTP8835 has the advantages of excellent transient and large dynamics, quick response, high resolution, clean and transparent sound, which is very obvious in the high frequency band. Traditional power amplifier design can easily pollute the high frequency accidentally. Because it has not been converted many times, it does not have the tendency of being thin and sharp in the high frequency of other digital amplifiers, and the sound is obviously pleasant to listen to. It also integrates multi-functional digital audio signal processing functions, high-performance, high-fidelity all-digital PWM modulators and two high-power full-bridge MOSFET power stages. Industry customers are welcome to obtain datasheets, quotations, samples and other product information on chips.