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Silicon Labs’ July 29, 2019 announcement added hybrid software-defined-radio (SDR) models, the Si479x7, to its Si479xx automotive tuner family and brought SDR-oriented digital signal-processing features to existing Si4790x/1x/2x/5x/6x devices. The update was designed to help automakers and Tier 1 suppliers reuse radio hardware and software across markets and broadcast standards. Silicon Labs described the Si479x7 as its first automotive tuner supporting Digital Radio Mondiale (DRM).
What changed in the Si479xx family?
The Si479x7 extends Silicon Labs’ Global Eagle and Dual Eagle AM/FM and digital-radio tuner families with a hybrid SDR approach. It is not described as a fully general-purpose software radio: the update adds specific DSP capabilities intended to help a common tuner platform work with different digital-radio standards.
Silicon Labs also said the new devices maintain pin and package compatibility between single- and dual-tuner options. Its broader Si479xx platform was designed around a shared API so infotainment developers could reuse software across product lines. An earlier family announcement described a low-IF digital architecture with integrated ADC and DAC audio paths; those are platform-context features, not new capabilities attributed specifically to the Si479x7 announcement. Silicon Labs’ earlier Si479xx announcement.
Which SDR features were added?
The 2019 announcement identifies four SDR-friendly DSP functions. Silicon Labs presented them as tools for a reusable hardware and software design that can support digital-radio standards around the world.
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- Mini stereo FM receiver module adopts advanced DSP and PLL technology ensure high quality broadcast receiving performance
- 2. Application: 1>. FM Wireless Frequency 2>. USB PC Audio Broadcast 3>. Wireless Microphone 4>. Maternal And Infants Custody
- the FM transmitter module has a blue backlit LCD display, allowing you to clearly see the value in a dark environment
- On-board 2X3W stereo audio amplifier chip enable you to DIY FM radio easily, no extra audio amplifier circuit needed
- Working Voltage: DC 3-5V, Frequency Range: 50Hz-18KHz, Output Power: 500mW, Board Size: 75 X 45 X 30mm/2.95 X 1.77 X 1.18inch
- Maximal ratio combining (MRC): a signal-combining function included in the SDR-oriented DSP update.
- Digital automatic gain control (AGC): adjusts signal gain digitally.
- Digital Radio Fast Detect: a function for quickly detecting digital-radio signals.
- Dynamic zero-IF (ZIF) I/Q: dynamic in-phase and quadrature signal handling using a zero-intermediate-frequency architecture.
The announcement does not specify performance figures or implementation details for these functions, so they should be understood as listed capabilities rather than a quantified performance comparison.
Does the Si479x7 support DRM?
Yes. Silicon Labs called the Si479x7 its first automotive tuner with DRM support. The announcement lists DRM30, which operates up to 30 MHz, and DRM+, which operates up to 300 MHz. It described DRM30 as prevalent in India and noted trials in Russia and South Africa. Those statements reflect the market context in Silicon Labs’ 2019 announcement, not a current deployment survey.
Rank #2
- Mini stereo FM receiver module adopts advanced DSP and PLL technology ensure high quality broadcast receiving performance
- Blue backlight LCD display and potentiometer regulate the volume and frequency easy to operation
- On-board 2X3W stereo audio amplifier chip enable you to DIY FM radio easily, no extra audio amplifier circuit needed
- Working Voltage: DC 3-5V, Frequency Range: 50Hz-18KHz, Output Power: 500mW, Board Size: 75 X 45 X 30mm/2.95 X 1.77 X 1.18inch
The announcement lists support for DRM alongside other radio formats and bands, but it does not provide a country-by-country compatibility matrix or identify every Si479xx model’s individual standard support. Check the specific device documentation for a design’s required band and format.
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Which radio standards and bands are covered?
Silicon Labs lists the Si479xx portfolio as covering the following analog bands and digital-radio standards:
Rank #3
- Does NOT include antenna
- SXV300V1 by itself with no other accesories
- Compatible with SiriusXM ready receivers only
- AM and FM
- Long Wave (LW) and Short Wave (SW)
- Weather Band
- HD Radio
- DAB Band III
- DRM, including DRM30 and DRM+
The 2019 release characterized HD Radio and DAB as predominant in the United States and Europe, respectively. That is the company’s market framing at announcement time; it should not be taken as a definitive account of present-day regional adoption.
Single or dual tuner: package and board-area figures
Silicon Labs announced two QFN package options. Its board-area figures are stated as less-than values, not exact package footprints.
Rank #4
- 【Complete FM Tuner Solution】Our Si4703 module offers a full FM radio system, transforming radio input into clear stereo output with integrated DSP for symbol decoding and error correction. Suitable for hobbyists and professionals using Arduino, AVR, or PIC microcontrollers, this module simplifies your radio projects with superior performance.
- 【Advanced Audio Processing】Enjoy crystal-clear sound with our module's digital signal processing (DSP) technology, which handles channel selection, FM demodulation, and stereo audio processing. The automatic gain control (AGC) circuit enhances sensitivity and reduces noise, ensuring high-quality audio for all your listening needs.
- 【Seamless Integration】Designed for easy integration, this module features a 3-wire communication interface and IIC compatibility, supporting up to 2.5MHz and 400KHz respectively. Whether you're developing with ARM or microcontrollers, our FM radio module is your Suitable companion for seamless connectivity.
- 【Robust Build with Safety Features】Equipped with a 150mW stereo power amplifier, this module includes thermal and short-circuit protection, plus a 3.5mm headphone jack for versatile usage. Connect to your microcontroller to control volume, perform auto/manual searches, and manage signal strength effortlessly.
- 【Versatile and Reliable】Operating in a wide frequency range of 76 ~ 108MHz, our module is designed to perform in diverse s from -20°C to 85°C. The integrated LDO regulator allows direct battery connection, making this module a reliable choice for all your wireless radio projects.
| Option | Package | Announced board area |
|---|---|---|
| Single tuner | 48-pin, 7 mm × 7 mm QFN | Less than 55 mm² (Silicon Labs, 2019 announcement) |
| Dual tuner | 56-pin, 8 mm × 8 mm QFN | Less than 79 mm² (Silicon Labs, 2019 announcement) |
The dual-tuner option provides two tuners in a package; the single-tuner option provides one. Silicon Labs positioned the pin and package compatibility between the options as a way to simplify product-family design, while the shared platform and API were intended to support software reuse. The announcement does not publish a full bill-of-materials comparison or quantify development savings.
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Silicon Labs said samples and production quantities were available when it announced the Si479x7 on July 29, 2019, and directed customers to local sales representatives for pricing and ordering. It also offered evaluation kits. These are historical availability statements and do not establish current stock, pricing, or product lifecycle status.
Best Value
- 【Professional FM Radio Receiver】-- Facmogu FM radio receiver adopts professional Si4730 radio chip for better reception, higher signal sensitivity and better resistance to electrical interference. Also comes with 33ft long cable retractable antenna, you can position the antenna windowsill or rooftop(magnetic base helps you fix the antenna position), you can enjoy clear signal reception and explore various radio stations and enjoy your favourite programmes on different channels anytime, anywhere
- 【Support Global Frequency】-- Our Mini FM radio receivers feature a total of three sets of frequencies that support worldwide use, covering the standard FM radio bands of 64-108 MHz, 76-108 MHz and 87-108 MHz, ensuring that a wide range of stations
- 【Auto & Manual Search & Memory Function】-- Professional FM radio receiver with one rotary knob and two buttons which is very easy to use. Long press the rotary button to enter the manual frequency tuning function, long press the ATS button to enter the automatic station search function, long press the VHF to select the country frequency (three groups of frequencies, worldwide use), short press the VHF to store the station
- 【Minimalist Design】-- FM radio receiver is compact and sturdy with an black alloy case. Although there are few buttons, we have integrated almost all the adjustment functions above the rotary knob, you can easily control all the functions with this one knob.Long press the knob to enter the manual FM function, and short press the knob to enter the volume function, rotate the knob to adjust the volume or the station without any complicated buttons
- 【Package Content】-- 1 x FM radio receiver, 1 x USB -C cable, 1 x AV cable, 1 x 3.5mm audio cable, 1 x 10m retractable antenna, 1 x user manual. *Note: Combined with amplifiers, CD players and speakers, it delivers immersive sound performance to ensure an enjoyable listening experience
An earlier Si4790x release named the Si4791-3T1A-EVB evaluation kit and gave an announcement price of $1,495 USD in 2014. That is a historical figure for the earlier kit, not a current price or a confirmed price for a Si479x7 kit. Silicon Labs’ 2014 Si4790x release.
For a new design, request the current device datasheet, supported-format details, evaluation-kit options, availability, and pricing directly from Silicon Labs or an authorized distributor before selecting a part.
Why Silicon Labs pursued a common tuner platform
Automotive radios are sold across regions with different broadcast formats. Silicon Labs’ stated goal was to let OEMs and Tier 1 suppliers use a more reusable hardware and software platform for worldwide digital-radio standards, reducing design and sourcing complexity. Juan Revilla, then General Manager of Broadcast Products at Silicon Labs, said the company’s advanced digital-radio tuners enabled radio manufacturers to develop “a single platform to demodulate and decode worldwide digital radio standards.” Silicon Labs’ July 29, 2019 announcement.
Quick Recap
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