Si4700/01
Broadcast FM Radio Tuner for Portable Applications
Description
The Si4700 is the industry's first FM radio tuner IC to
leverage digital integration and 100% CMOS process
technology, resulting in a completely integrated solution
that requires only one external supply bypass capacitor
and less than 20 mm
2
of board space. Offering unmatched
integration, the Si4700 allows FM radio reception to be
added to a variety of portable devices where board space,
performance, low power consumption, and ease of use are
essential.
Leveraging Silicon Laboratories' proven Aero
®
digital low
intermediate frequency (low-IF) receiver architecture and
frequency synthesizer technology, the Si4700 delivers
superior RF performance and interference rejection. Digital
signal processing is utilized to provide optimum sound
quality with varying reception conditions.
The high integration and complete system production test
simplifies design-in, increases quality, and improves
manufacturing. The Si4700 also uses a streamlined
programming model, which further reduces product
development time. Power management is also simplified
with an integrated regulator allowing direct connection to a
2.7 to 5.5 V battery.
The Si4701 incorporates a digital processor for the
European Radio Data System (RDS) and the US Radio
Broadcast Data System (RBDS) including all required
symbol decoding, block synchronization, error detection,
and error correction functions. Using this feature, the
Si4701 enables data such as station identification and
song name to be displayed to the user.
Features
Worldwide FM band support (76–108 MHz)
Digital low-IF receiver
Frequency synthesizer with integrated VCO
Seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Excellent overload immunity
Signal strength measurement
Programmable de-emphasis (50/75 µs)
Adaptive noise suppression
Volume control
Line-level analog output
32.768 kHz reference clock
RDS/RBDS processor (Si4701 only)
2-wire and 3-wire control interface
2.7 to 5.5 V supply voltage
Integrated LDO regulator allows direct connection
to battery
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4x4 mm 24-pin QFN package
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Lead-free/RoHS compliant
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Applications
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Cellular handsets
MP3 players
PDAs, Notebook PCs
Portable radios
USB FM radio
Headphone
Cable
FMIP
FMIN
PGA
Q
ADC
I
ADC
Si4700/01
DAC
FILTER
DEMOD
MPX
AUDIO
DAC
ROUT
AGC
32.768 kHz
0 / 90
LOW-IF
GPIO
GPIO
VIO
CONTROL
INTERFACE
RCLK
2.7 - 5.5 V
VA
VD
TUNE
AFC
RDS
(Si4701)
RST
SDIO
SCLK
SEN
REG
RSSI
FM Tuner
Copyright © 2005 by Silicon Laboratories
CONTROLLER
7.11.05
AMPLIFIER
DSP
LOUT
FPGA/CPLD
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