Si4734/35
Broadcast AM/FM/SW/LW Radio Receiver
Description
Features
The Si4734/35 is the industry's first fully integrated, 100%
CMOS AM/FM/SW/LW radio receiver IC. Offering
unmatched integration and PCB space savings, the
Si4734/35 requires minimal external components and less
than 20 mm2 of board area, excluding the antenna inputs.
The Si4734/35 AM/FM/SW/LW radio provides the space
savings and low power consumption necessary for portable
devices while delivering the high performance and design
simplicity desired for all AM/FM/SW/LW solutions.
Leveraging Silicon Laboratories' proven and patented
Si4700/01 FM tuner's digital low intermediate frequency
(low-IF) receiver architecture, the Si4734/35 delivers
superior RF performance and interference rejection in AM,
FM, and short wave and long wave bands. The high
integration and complete system production test simplifies
design-in, increases system quality, and improves
manufacturability.
The Si4734/35 is a feature-rich solution including
advanced seek algorithms, soft mute, auto-calibrated
digital tuning, and FM stereo processing. In addition, the
Si4734/35 provides analog or digital audio output and a
programmable reference clock. The device supports I2Ccompatible 2-wire control interface, SPI, and a Si4700/01
backwards-compatible 3-wire control interface.
The Si4734/35 utilizes digital processing to achieve high
fidelity, optimal performance, and design flexibility. The
chip provides excellent pilot rejection, selectivity, and
unmatched audio performance, and offers both the
manufacturer and the end-user extensive programmability
and flexibility in the listening experience.
The Si4735 incorporates a digital processor for the
European Radio Data System (RDS) and the North
American Radio Broadcast Data System (RBDS), including
all required symbol decoding, block synchronization, error
detection, and error correction functions. Using RDS, the
Si4735 enables broadcast data such as station
identification and song name to be displayed to the user.
-
Worldwide FM band support (64–108 MHz)
Worldwide AM band support(520–1710 kHz)
SW band support (2.3–21.85 MHz)
LW band support (153–279 KHz)
Excellent real-world performance
Freq synthesizer with integrated VCO
Automatic frequency control (AFC)
Automatic gain control (AGC)
Integrated LDO regulator
Digital FM stereo decoder
Programmable de-emphasis
Adaptive noise suppression
AM/FM/SW/LW digital tuning
No manual alignment necessary
Adjustable channel filters
EN55020 complaint
Programmable reference clock
Digital volume control
Adjustable soft mute control
RDS/RBDS processor (Si4735 only)
Optional digital audio out (Si4735 only)
2-wire and 3-wire control interface
2.7 to 5.5 V supply voltage
Wide range of ferrite loop sticks and air loop antennas
supported
- 3 x 3 x 0.55 mm 20-pin QFN package
- Pb-free/RoHS compliant
Applications
-
Table and portable radios
Stereos
Mini/micro systems
Portable media players
Boomboxes
Clock radios
Modules
Entertainment systems
Cellular handsets
FM/SW
ANT
Si4734/35
FMI
RDS
(Si4735)
LNA
LOW-IF
AGC
ADC
LNA
2.7–5.5 V
ADC
VDD
LDO
AFC
RCLK
GND
AM/FM Receiver
DAC
LOUT
DSP
CONTROL
INTERFACE
VIO
1.5–3.6 V
RST
AGC
DFS
GPO/DCLK
ROUT
SDIO
RFGND
DOUT
DAC
SEN
AMI
SCLK
AM/LW
ANT
DIGITAL
AUDIO
(Si4735)
Copyright © 2008 by Silicon Laboratories
4.1.08
