Highly integrated vehicle AM ​​/ FM receiver solution
As the car changes from a mobility tool to a personalized consumer product that integrates leisure and entertainment, consumers' requirements for automotive entertainment are constantly increasing, and the automotive industry is also facing strong market pressure, and it is urgent to reduce it without sacrificing performance Cost, this phenomenon is particularly evident in the entry-level car market, and consumer demand for low-cost vehicles has caused the market's annual growth rate to exceed 10%. Silicon Labs leverages its core capabilities in designing high-efficiency mixed-signal CMOS chips, targeting the huge and rapidly growing field of automotive electronics and infotainment, and meeting its needs for cost reduction and simple design with its well-established broadcast audio products .
The automotive AM / FM receiver Si474x is a fully integrated entry-level low-IF radio chip solution from Silicon Labs. Silicon Labs first introduced the RF-to-Audio receiver chip in 2005, which has been released so far. More than 200 million goods. By using a CMOS process, Silicon Labs can combine digital signals and RF into a single-chip architecture, that is, integrate digital signal processors and RF into a single chip, which realizes the integration from RF to audio, so it can greatly reduce external components and reduce the system. cost.
Streamlined design speeds time to market
Si474x's chip is highly integrated with LNA, LDO, AFC, AGC, ADC, DSP, DAC, RDS and other functional modules, so that engineers do not need to consider too many peripheral complex circuit design when designing, avoiding too many peripherals Some external influences such as coupling and radio frequency signals caused by the circuit. Compared with other competitive solutions, Si474x can reduce peripheral components and corresponding costs by more than 40%.
Highly integrated vehicle AM ​​/ FM receiver solution
From Figure 1, we can see that due to the high level of integration of the Si474X series and very few external components, there is no need to manually calibrate as before, and the designer can easily design on the single-layer board, all the bill of materials Including, less than 4 mm2 of printed circuit board space is required, and the degree of integration of the chip can minimize the sensitive RF signal transmission path around the chip, thereby reducing the interference of the RF signal on the periphery and further simplifying the PCB design Process to reduce manufacturing costs.
At the same time, the Si474x series provides a receiver that builds a complete audio and data receiving system. Within this chip, a fully integrated entry-level low-IF radio chip solution can be realized, which can receive FM, AM, shortwave, longwave and RDS, and even the weather channel. Weather broadcasts can also be received, and global radio broadcast reception bands can be realized, such as 76MHz-90MHz, 87.5MHz-108MHz and other channels in Japan. At the same time, Si474x series can output analog audio signals and digital audio signals, and can directly record.
Due to the special working environment of automotive electronics, audio receivers are often subject to interference from the external environment, which may cause noise and signal attenuation, reducing component performance. Because the radio waves are reflected by tall buildings and trees, Si474x receives reflected waves with different amplitudes and phases. For this reason, the Si474x design includes multipath signal suppression. As shown in Figure 2, the DSP inside Si474x will detect and suppress multipath interference, which can improve the adverse effects caused by multipath interference and improve the performance of the radio receiver in the case of multipath.
Highly integrated vehicle AM ​​/ FM receiver solution
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Due to the noisy environment in the car, such as engine starting and noise from other electrical equipment (such as wipers, power windows), etc., 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 threshold, interval, rate, filtering bandwidth and delay.
In addition, the Si474x chip also integrates the RDS (Radio Data System) decoder. The decoder can transmit text content such as sports, transportation, and some music and entertainment information through the FM band to the Si474x chip through the FM band. After being processed and converted by the RDS decoder, it is output to the main chip and displayed on the screen, which brings great convenience and practicality to people. All these functions are completed automatically inside the chip. Designers only need to control the chip through software settings through few interfaces, which reduces many manual operations and increases the degree of automation of production. At the same time, because of the high degree of integration, the compatibility of software and hardware and the porting of software are easy, so users can design and produce with ease, speeding time to market.
The industry standards for automotive electronics are very strict. Si474x has excellent automotive electronics quality and performance and meets AEC-Q100 specifications. Silicon Labs has passed the ISO / TS-16949 international automotive industry quality system standard certification.
The entry-level car radio market is growing rapidly, and Silicon Labs is good at meeting the various needs derived from this market. Using its well-recognized and patented CMOS digital architecture, Silicon Labs is reducing costs for this important market. , More completely without compromising its performance and consumers' expectations for car quality.
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