As the car changes from a transit tool to a personalized consumer product that combines leisure and entertainment, consumers' demands for car entertainment continue to increase, and the automotive industry is facing strong market pressure, which needs to be reduced without sacrificing performance. Cost, this phenomenon is particularly evident in the entry-level automotive market, and consumer demand for low-cost vehicles has allowed the market to grow at an annual rate of more than 10%. Silicon Labs leverages the core capabilities of designing high-performance mixed-signal CMOS chips to target the vast and rapidly growing automotive electronics and infotainment sectors with its proven broadcast audio products to meet the cost and ease of design in this area. .
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The car's AM/FM receiver Si474x is Silicon Labs' fully integrated entry-level low-IF radio chip solution. Silicon Labs first introduced the RF-to-Audio receiver chip in 2005. More than 200 million goods. With CMOS technology, Silicon Labs can combine digital signals and RF into a single-chip architecture. It also integrates digital signal processor and RF into a single chip, enabling integration from RF to audio, thus reducing external components and system. cost.
Streamlined design speeds time to market
The Si474x chip integrates LNA, LDO, AFC, AGC, ADC, DSP, DAC, RDS and other functional modules, so that engineers do not have to consider too many peripheral complex circuits when designing, avoiding excessive peripherals. Some external effects such as coupling, RF signals, etc. caused by the circuit. Compared to other competing solutions, the Si474x can reduce peripheral components and corresponding costs by more than 40%.
Highly integrated vehicle AM/FM receiver solution
As can be seen from Figure 1, because the Si474X series has high integration and few external components, it does not need to be manually calibrated as before, and designers can easily design on single-layer boards, all bills of materials. Including, it only requires less than 4 mm2 of printed circuit board space. The integration of the chip minimizes the sensitive RF signal transmission path on the periphery of the chip, thereby reducing peripheral interference with RF signals and further simplifying PCB design. Process to reduce manufacturing costs.
At the same time, the Si474x series provides a receiver for building a complete audio and data receiving system, enabling a fully integrated entry-level low-IF radio chip solution that can receive FM, AM, short-wave, long-wave and RDS, even weather channels. Weather broadcasts can also be received, and global radio broadcast reception bands can be realized. For example, channels such as 76MHz-90MHz and 87.5MHz-108MHz in Japan can be received. At the same time, the Si474x series can output analog audio signals and digital audio signals, and can directly record.
Due to the special electronic working environment of the car, the audio receiver is often disturbed by the external environment, which will generate noise and signal attenuation, and reduce component performance. Because the radio waves are reflected by tall buildings and trees, the Si474x receives reflected waves of varying amplitude and phase. For this reason, the Si474x design includes multipath signal suppression. As shown in Figure 2, the DSP inside the Si474x detects and suppresses multipath interference, which improves the adverse effects of multipath interference and improves the performance of the radio receiver in multipath situations.
Highly integrated vehicle AM/FM receiver solution
Because the interior environment is noisy, such as engine launch and other electrical equipment (such as wipers, power windows) noise will affect the chip, Si474x provides fully configured AM and FM noise suppressors to reduce the noise of external interference. AM and FM noise suppressors improve sound quality by setting detection thresholds, spacing, rate, filter bandwidth, and delay.
In addition, the Si474x chip also integrates the RDS (Radio Data System) decoder, which can transmit text content, such as sports, transportation and some music and entertainment information, to the Si474x chip through the FM band through the FM band. After processing and conversion by the RDS decoder, the output is output to the main chip and displayed on the screen, which brings great convenience and practicability to people. All of these functions are done automatically inside the chip. The designer only needs to control the chip through software settings through a few interfaces, which reduces the manual operation of many people and increases the automation of production. At the same time, due to the high degree of integration, software and hardware compatibility and software migration are easy, so users can easily design and produce, speeding up time to market.
The industry standard for automotive electronics is very strict. The Si474x has excellent automotive electronics quality and performance and meets AEC-Q100 specifications. Silicon Labs has passed ISO/TS-16949 international automotive industry quality system certification.
The entry-level automotive radio market is growing rapidly, and Silicon Labs is good at meeting the needs of this market. With its proven and patented CMOS digital architecture, Silicon Labs is reducing costs in this important market. , more completely without compromising its performance and consumer expectations for the quality of the car.
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