SI4700 Datasheet, PDF (1/2 Pages) Silicon Laboratories – Broadcast FM Radio Tuner for Portable Applications

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 mm² 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
- 4x4 mm 24-pin QFN package
- Lead-free/RoHS compliant
Applications
- Cellular handsets
- MP3 players
- PDAs, Notebook PCs
- Portable radios
- USB FM radio
Headphone
Cable
FMIP
FMIN
Si4700/01
I
ADC
DSP
DAC
LOUT
PGA
FILTER
DEMOD
Q
ADC
MPX
DAC
AUDIO
ROUT
AGC
0 / 90
32.768 kHz
RCLK _TUNE
AFC
2.7 - 5.5 V _VA
VD
REG
LOW-IF GPIO
RDS
(Si4701)
RSSI
GPIO
VIO
RST
SDIO
SCLK
SEN
FM Tuner
Copyright © 2005 by Silicon Laboratories
7.11.05