si4720 Silicon Laboratories, si4720 Datasheet

si4720

Manufacturer Part Number

si4720

Description

Broadcast Fm Radio Transceiver For Portable Applications

Manufacturer

Silicon Laboratories

Datasheet

1.SI4720.pdf (2 pages)

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Description

The Si4720/21 is the first single chip FM radio transceiver.

The proven and patented digital architecture of the Si4720/

21 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

Lab's 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 Si4720/21 offers industry leading size,

performance, low power consumption, 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

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.

performance,

programmability are key advantages of the Si4720/21.

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) standards.

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

transmitted and displayed on any RDS/RBDS receiver.

Users are responsible for adjusting their system's radiated

power levels to comply with local regulations on RF

transmission (FCC, ETSI, ARIB, etc.).

FM Transceiver

category,

High

Tx/Rx Ant

Headphone

Rx Ant*

*Note: Dedicated Rx antenna is optional

easy

yield

2.7–5.5 V

and

Broadcast FM Radio Transceiver for Portable Applications

120 nH

RFGND

22 uF

branded

manufacturability,

design-in,

GND

VDD

TXO

FMI

messaging

LNA

AGC

LDO

and

unmatched

can

software

. The

PGA

AFC

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 µs)

- 2-wire and 3-wire control 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

ADC

GPO

DSP

DAC

INTERFACE

Si4720/21

CONTROL

Si4720/21

LIN/DFS

RIN/DOUT

ROUT/DIN

LOUT/DFS

3.26.08

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si4720 Summary of contents

Page 1

... 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 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 ...

Page 2

... Min Nom Max A 0.50 0.55 0.60 A1 0.00 0.02 0.05 b 0.18 0.25 0.30 c 0.27 0.32 0.37 D 3.00 BSC D2 1.60 1.70 1.80 e 0.50 BSC E 3.00 BSC E2 1.60 1.70 1.80 Copyright © 2008 by Silicon Laboratories Si4720/21 Min Typ Max Unit 76 — 108 MHz — 2.2 3.5 µV EMF — 1.1 — µV EMF 100 105 — dBµV EMF — — mVrms ...

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