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The Si472x is the first single-chip FM radio transceiver. The proven and patented digital architecture of the Si472x combines the functionality of the Si470x FM radio receiver with the Si471x FM transmitter, offering full FM receive and transmit capabilities in a single, ultra-small 3x3x0.55 mm QFN package. The device leverages Silicon Labs' highly successful and proven FM technology, and offers unmatched integration and performance allowing FM receive and transmit to be added to any portable device by using a single chip. As with the Si470x and Si471x products, the Si472x offers industry leading size, performance, low power consumption and ease of use.
  Si4720 - FM radio receiver and transmitter with digital audio compression
Si4721 - FM radio receiver and transmitter with digital audio compression and RDS
The Si472x's digital integration reduces the required external components of traditional offerings, resulting in a solution requiring only an external inductor and bypass capacitor, and a PCB space of approximately 15 mm². The Si472x1 is layout compatible with Silicon Labs' Si470x FM radio receivers, Si473x AM/FM radio receivers and the Si471x FM radio transmitter solutions, allowing a single PCB layout to accommodate a variety of music features. High yield manufacturability, unmatched performance, easy design-in and software programmability are key advantages of the Si472x.
The Si4721 is the industry's first single-chip integrated FM radio transceiver including both receive and transmit support for the European Radio Data System (RDS) and the U.S. Radio Broadcast Data System (RBDS). RDS allows digital information sent from the broadcaster to be displayed, such as station ID, song name and music category. In Europe, alternate frequency (AF) information is also provided to automatically change stations in areas where broadcasters use multiple frequencies. In transmit mode, digital information such as artist name, song title, music category and branded messaging can be transmitted and displayed on any RDS/RBDS receiver.
Users are responsible to adjust their system's radiated power levels to comply with local regulations on RF transmission (FCC, ETSI, ARIB, etc.).
Si472x Block Diagram
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