SI4735-D60-GU AM/FM Radio IC

The Si473x-D60 digital CMOS AM/FM radio receiver IC integrates the complete tuner function from antenna input to digital audio output and includes a stereo audio AUXIN ADC input for converting analog audio into standard I2S digital audio, enabling a cost efficient digital audio platform for consumer electronic applications with high TDMA noise immunity, superior radio performance, and high fidelity audio power amplification. When enabling the analog inputs in stereo AUXIN ADC-mode, the Si473x-D60 supports I2S digital audio output only.

Note: We are currently updating our images, they show the older version of the IC.

  • Wide range of ferrite loop sticks and air loop antennas supported
  • Worldwide FM band support (64–108 MHz)
  • Worldwide AM band support (520–1710 kHz)
  • SW band support (2.3–26.1 MHz)
  • LW band support (153–279 kHz)
  • Advanced AM/FM seek tuning
  • Automatic frequency control (AFC) and gain control (AGC)
  • AM/FM/SW/LW digital tuning with digital FM stereo decoder
  • Programmable de-emphasis
  • Multiplexed stereo audio AUXIN
  • ADC with 85 dB dynamic range
  • Seven selectable AM channel filters
  • Programmable reference clock
  • Adjustable soft mute control
  • RDS/RBDS processor
  • 2-wire and 3-wire control interface
  • Integrated LDO regulator
  • EN55020 compliant
  • Digital audio out
  • Integrated VCO
  • [Datasheet]( IC/Si4730-31-34-35-D60.pdf)

SI4735-D60-GU AM/FM Radio IC Product Help and Resources

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

3 Soldering

Skill Level: Competent - You will encounter surface mount components and basic SMD soldering techniques are required.
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Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

3 Programming

Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
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Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • PSmith / about 11 years ago / 5

    "Note: We are currently updating our images, they show the older version of the IC."

    I can't wait to see what the new version of the IC looks like.

  • Member #141097 / about 9 years ago / 1

    Has anyone had any success with this chip? I am having trouble communicating with the chip. I modified the code for older Arduino shield with the previous chip but I can't seem to talk to the chip over i2c. My first attempt failed because the level converter from 5 v to 3.3 v did not support i2c. I replaced it with an i2c compatible level converter but still no luck. Any hints would be useful.

  • bryanpfremmer / about 10 years ago / 1

    Any updates on breakout board?

  • Member #418365 / about 10 years ago / 1

    Seeing that I can't rely on the image, do you carry the SSOP or the QFN package?

    Is a breakout board coming? Its been awhile.

  • jonaslorander / about 11 years ago / 1

    Would it be possible to use these to receive DARC data? Moving the RDS center frequency to 76 kHz would probably be enough, but I dcanät find any info in the datashett about it...

  • Erll / about 11 years ago / 1

    +1 for the weather band enabled version of this chip

  • Is there any hope for the SI4736-39 series to allow adding Weather Radio to the above abilities?

    • zwheel / about 11 years ago / 1


      I'd go for the si4743 instead. It does everything the above chip does PLUS weather band as opposed to the SI4736 which drops the short and long wave support. Of course, if you don't care about those you don't have to use that functionality. I'd like the chip where we can have EVERYTHING!!

  • Anyone who was looking at the C40 version of this chip (COM-10227), this is the newer revision from the manufacturer. It should be noted that while the C40 version supported SPI, this chip is I2C only.

  • Are you planning on updating the Si4735 Breakout board with this new IC version?

      • SRG / about 11 years ago / 1

        Any news about the upgraded SI4735 breakout board (which i'm looking for) ?

        • still in the works. it's not exactly a drop-in replacement, so we have to redo some things. but we're working on it.

          • Member #360676 / about 11 years ago / 2

            Is there a way to stay informed of when the SI4735 updated breakout will be? I mean, other than the new product Friday videos? I'm stoked for this update.


            • ugh, still in prototype phase... sorry!

              • Member #7476 / about 11 years ago / 2

                I'm also interested in this breakout board.

              • TLLabs / about 11 years ago / 2

                Just letting you know that I'm also interested in several breakout boards for this. Cheers!

              • YDOL / about 11 years ago / 2

                I'm interested in a breakout board for this chip as well. Any progress? ETA? Thanks.

              • Member #123801 / about 11 years ago / 2

                Add me to the list of interested parties.

              • Member #360676 / about 11 years ago / 2

                no worries :) take your time and do it right.

              • threadzless / about 10 years ago / 1

                plz hurry

                • rsavas / about 10 years ago * / 1

                  Will probably get myself in trouble but It is simple to make a breakout pcb. I will make everyone a deal, if I design the pcb, you have to fab it, I will supply the data. All I ask is that you send me a few pcbs. if people are interested, we can continue this discussion in another forum. BTW I design a tuner/media using this chip and the s/w to run a this chip is in the public domain.

                • looks like it's low on the priority list, sorry. I'll ping the project and see if we can move it along.

                  • Tarmo, OH6ECF / about 9 years ago / 1

                    Hi RobertC

                    I have been playing a lot with old si4735 shield and find it surpricingly good at SW. In fact it can be tuned up to over 28 Mhz, to amateur 10 meter band and receive SSB with additional local oscillator (not saying it is good SSB receiver, but it works. Like I have received weather charts with it).

                    This chip also have a firmware patch which natively supports SSB reception. (!!!!!! low voltage SSB-radio with very low power consumption!!!! AND internal antenna tuning capasitor!!!AND s/n and SNRI meters... and so on...)

                    Please make a new shield or breakout with SSB firmware patch! I bet many radioactive person would find this product interesting. Please RobertC, please...

                    Tarmo, OH6ECF

          • magee / about 11 years ago / 1

            " it’s not exactly a drop-in replacement, so we have to redo some things." Other than the loss of SPI and the analogue audio input, what else changed? I'm racking my brain an re-reading the data sheets over and over trying to figure out why i cant talk to the D60. I was talking to the c40 via i2c, but now wire.endTransmission() returns "2" (nack addr). I am about to put the C40 back in and cut my losses.

            • MJKennedy / about 11 years ago / 1

              "AN332 - Si47xx Programming Guide - Rev 0.8" in Appendix B, page 317 says the -D60 has a bug when placed in FM receive mode:

              There is a debug feature that remains active in Si4704/05/3x-D60 firmware which can create periodic noise in audio. Silicon Labs recommends you disable this feature by sending the following bytes (shown here in hexadecimal form):

              0x12 0x00 0xFF 0x00 0x00 0x00

              This is equivalent to setting property 0xFF00 to a value of 0x0000.

              It's a long shot but it might be worth trying.

              • magee / about 11 years ago / 1

                Good to know, thanks for the tip, I was wondering what that noise was. I got it working BTW, it was a mixture of problems. my signal to RST was below 70% of Vd (bad math on my part), so chip never came out of reset. And hence, no response to the power up command.

                • MJKennedy / about 11 years ago / 1

                  Glad to help. By the way, what board did you solder this chip to? Or did you make your own custom board?

                  • magee / about 11 years ago / 1

                    I've been working on my own custom board. I'm using a TDA7719 for audio switching and processing, and a Raspberry Pi with a touchscreen for a GUI. I have a working prototype and some new boards are being turned right now that will hopefully be the final revision. I'm willing to share more details and my project files, as long as it is understood that I am not an engineer so my design is far from perfect and this project is far from complete.

                    • rtgree01 / about 10 years ago / 1

                      I am working on a project that does audio switching using a TDA7719 as well. I would love to see what you've done. Although I am an engineer, I'm not an electrical engineer, so I know what you mean...

                      • magee / about 10 years ago / 1

                        I'm currently stalled on this project because of funding (kids and home repairs taking priority) but my latest rev for the audio board was successful. here is a photo of the board: I have moved from the raspberry pi to an Olimex A20 which handles audio much better, has a more forgiving power input and supports a SATA HDD. I'm saviing for a touchscreen and should be able to pick up the project again soon.

                    • Hal / about 11 years ago / 1

                      You should share them. It would be fun to take a looksy at what you did. Thanks!

      • Scamp Dog / about 11 years ago / 1

        Is that necessary? A quick scan of the pinouts from the two datasheets showed that the pinouts are identical. Can I go ahead and use the old boards, or is there something I missed?

        • Scamp Dog / about 11 years ago / 1

          Never mind, I just realized that the board came with the chip already on it. I suppose you could unsolder the original chip and replace it with the new version, but that seems like a lot of hassle.

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