fm transceiver copyright ? 2007 by silicon laboratories 1.18.07 adc adc si472x dsp dac dac pga afc mux fmi agc tx ant rx ant txo rfgnd rclk vio sclk sdio control interface sen gpo gpo3/dclk rst gpo2 lin /dfs rin /dio rout /dio lout /dfs gpo1 ldo vdd gnd 2.7 ? 5.5 v c1 22 uf rds (SI4721) l1 120 uh lna si4720/21 broadcast fm radio transceiver for portable applications description the si4720/21 is the first single chip fm radio transceiver. the proven and patented digital architecture of the si4720/ 21 combines the functionalit y 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 lab's highly successful and proven fm technology, and offers unmatched integrati on 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 si4720/21 offers industry leading size, performance, low power cons umption, and ease of use. the si4720/21'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 mm 2 . the si4720/21 is layout compatible with silicon laboratories' 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 adv antages of the si4720/21. the SI4721 is the industry's fi rst 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 statio n 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 adju st their system's radiated power levels to comply with local regulations on rf transmission (fcc, etsi, arib, etc.). features - integrated fm antenna support - excellent real-world performance - only two external components required - worldwide fm band support (76 to 108 mhz) - rds/rbds processor (SI4721) - frequency synthesizer with integrated vco - adjustable seek parameters - adjustable mono/stereo blend - adjustable soft mute - programmable transmit output voltage control - audio dynamic range control - advanced modulation control - analog/digital audio interface - programmable reference clock input - programmable pre/de-emphasis (50/75 s) - 2-wire and 3-wire co ntrol interface - integrated ldo regulator - 2.7 to 5.5 v supply voltage - 3x3x0.55 mm 20-pin pb-free qfn package applications - cellular handsets/hands free - mp3 players - portable media players - gps/navigation devices - satellite digital audio radios - personal computers
fm transceiver copyright ? 2007 by silicon laboratories 1.18.07 silicon laboratories and silicon labs are trademarks of silicon laboratories inc. other products or brandnames mentioned her ein are trademarks or registered tr ademarks of their respective holders si4720/21 broadcast fm radio transceiver for portable applications parameter symbol test condition min typ max unit frequency range f rf 76 ? 108 mhz sensitivity (s+n)/n = 26 db ? 2.2 ? v emf input ip3 |f 2 ? f 1 | > 1 mhz; f 0 = 2 x f 1 ? f 2 agc disabled ? 108 ? dbv emf adjacent channel selectivity 200 khz ? 50 ? db alternate channel selectivity 400 khz ? 70 ? db rx audio output voltage 72 80 90 mvrms rx audio band limits 1.5 db 30 ? 15k hz rx audio s/n ? 63 ? db rx audio thd ? 0.1 ? % programmable transmit output
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