Si4704/05
Enhanced Broadcast FM Radio Receiver for Portable Applications
Description
The Si4704/05 enhanced FM receiver is the most
advanced portable solution available today offering
embedded antenna support, digital audio out, worldwide
FM band support, and highly flexible, mature, and proven
FM functionality in a simple API. The Si4704/05
incorporates Silicon Labs' tuned-resonance antenna
technology for crystal clear FM reception in wire-free
device enclosures. Silabs' internationally patented tuned-
resonance technology allows embedded FM antennas
such as PCB traces, loops, stubs, or other devices to
perform exceptionally well, enabling devices with
integrated Bluetooth to receive FM transmissions without
an external FM antenna, and transmit the FM content to
Bluetooth-enabled headsets. This is the best, most cost-
effective solution to enable wire-free FM reception.
The Si4705 also offers digital audio out for FM recording.
Content recorded over the Si4705 can be shared with
friends or played at a later time in MP3 format. The content
can also be tagged with RDS information, allowing song
name and artist labels to be displayed as is done with MP3
meta data. Using the digital audio out, the Si4705 can also
reduce total system power consumption by avoiding
unnecessary ADC/DAC conversions between the FM
receiver and the host processor.
The Si4704/05 truly supports worldwide FM bands, starting
at 64 MHz for Eastern European countries and extending
all the way to 108 MHz for the rest of the world. The device
supports channel spacing down to 10 kHz, and includes
advanced, proven seek functionality. All the Silicon Labs
proven FM receiver expertise is incorporated in the Si4704/
05, gained through thousands of designs with almost every
OEM and ODM in the world and over 100 million devices
shipped.
The Si4704/05 leverage Silicon Labs' internationally
patented and proven digital low-IF architecture, offering
proven functionality in a simple and mature API. The
device is offered in a highly reliable, ultra-small
3 x 3 x 0.55 mm 20-pin QFN and is layout compatible with
the full suite of Silicon Labs broadcast offerings including
Headphone
Cable
FMI
RFGND
LNA
PGA
ADC
AGC
0/90
RSSI
AFC
RDS
(Si4705)
DIGITAL INTERFACE
(Si4705)
ADC
DSP
DAC
ROUT
GPO
DCLK
DOUT
DFS
FM transmit, AM/FM/SW receive, weather band receive
and SAME decode, and unparalleled RDS data receivers.
The complete solution, including a minimal BOM, requires
less than 15 mm
2
board area, or less than half that of other
competing solutions. The Si4705 incorporates Silicon Labs'
proven and widely adopted RDS processor, including
worldwide compliance, all symbol decoding, error
detection, error correction, and other RDS functions. The
Si4705 RDS functionality is unmatched in the industry for
performance, on-chip processing, and worldwide adoption.
Features
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Worldwide FM band support (64~108 MHz)
Supports integrated antenna
Digital low-IF receiver
Excellent real-world performance
Frequency synthesizer with integrated VCO
Seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Integrated LDO regulator
Minimal BOM
Adjustable seek parameters
Adjustable mono/stereo blend
Adjustable soft mute
RDS/RBDS decoder(Si4705 only)
Optional digital audio output (Si4705 only)
Programmable de-emphasis(50/75us)
Programmable reference clock input
Signal quality measurement
3 x 3 x 0.55 mm 20-pin Pb-free QFN package
Cellular handsets
MP3 players
Portable media players
Personal computers
Portable navigation devices
Consumer electronics
Applications
Si4704/05
DAC
LOUT
LPI
32.768 kHz
RCLK
2.7–5.5 V
VDD
REG
XTAL
OSC
SEN
CONTROL
INTERFACE
SCLK
RST
FM Tuner
Copyright © 2008 by Silicon Laboratories
SDIO
VIO
4.02.08
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