Si 4 7 3 x - B2 0
B
ROADCAST
M
ULTI
-B
AND
R
ADIO
R
ECEIVER
Features
FM band support: 76–108 MHz
AM band support: 520–1710 kHz
SW band support: 2.3–21.85 MHz
Adaptive noise suppression
AM/FM digital tuning
EN55020 compliant
No manual alignment necessary
Programmable reference clock
Volume control
Programmable soft mute control
RDS/RBDS processor
GPO3/DCLK
17
10
VIO
GPO2/INT
(Si4734/35)
LW band support: 153–279 kHz
(Si4734/35)
Weather band support: 162.4–
162.55 MHz (Si4736/37/38/39)
1050 Hz alert tone detection
(Si4736/37/38/39)
Excellent real-world performance
Freq synthesizer with integrated VCO
Advanced seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Integrated LDO regulator
Digital FM stereo decoder
Programmable de-emphasis
(Si4731/35/37/39)
Optional digital audio output
(Si4731/35/37/39)
2-wire control interface
2.7 to 5.5 V supply voltage
Firmware upgradeable
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
Ordering Information:
See page 18.
Pin Assignments
Si473x-GM
(Top View)
GPO1
NC
Applications
Table and portable radios
Audio video receivers
Stereos
Mini/micro systems
CD/DVD players
Portable media players
Cellular handsets
Emergency radios
Clock radios
Modules
Mini HiFi
Boom boxes
NC
1
20
19
18
16
15 DOUT
FMI 2
RFGND 3
AMI 4
RST 5
6
SEN
7
SCLK
8
SDIO
9
RCLK
GND
PAD
11 VDD
Si473x Product Selector Guide
Part
Si4730
Si4731
Si4734
Si4735
Si4736
Si4737
Si4738
Si4739
FM
76 – 108 MHz
76 – 108 MHz
64 – 108 MHz
64 – 108 MHz
76 – 108 MHz
76 – 108 MHz
76 – 108 MHz
76 – 108 MHz
AM
RDS
SW/LW
WB
Patents Pending
Notes:
1.
Place Si473x as close as
possible to antenna jack and
keep the FMI and AMI traces as
short as possible.
2.
Contact your local sales
representatives for more
information or to obtain
application notes.
Rev. 0.5 10/08
Copyright © 2008 by Silicon Laboratories
Si473x-B20
DFS
14 LOUT
13 ROUT
12 GND
Si473x-B20
T
ABLE
Section
OF
C
ONTENTS
Page
1. Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
3. Typical AM/FM Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5. Pin Descriptions: Si473x-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7. Package Outline: Si473x QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8. PCB Land Pattern: Si473x QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Rev. 0.5
3
Si473x-B20
1. Product Overview
The Si473x receivers are the industry's first fully-integrated multiband radio receiver ICs from antenna input to
audio output. They require minimal external components with no factory alignment. The Si473x receivers reduce
the receiver footprint by >90% versus traditional AM/FM solutions. The Si473x also offer best-in-class performance
with the most features. The high integration and complete system production test simplifies design-in, increases
system quality, and improves manufacturability.
The Si473x receivers include advanced seek algorithms, adjustable soft mute, auto-calibrated digital tuning, and
FM stereo processing. In addition, the Si473x ICs provide a programmable reference clock and an I2C-compatible
2-wire control interface.
The Si4731/35/37/39 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 these features, the Si4731/35/37/39 enables broadcast data
such as station identification and song name to be displayed to the end user.
2. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
Supply Voltage
Interface Supply Voltage
Power Supply Powerup Rise Time
Interface Power Supply Powerup Rise Time
Ambient Temperature
Symbol
V
DD
V
IO
V
DDRISE
V
IORISE
T
A
Test Condition
Min
2.7
1.5
10
10
–20
Typ
—
—
—
—
25
Max
5.5
3.6
—
—
85
Unit
V
V
µs
µs
C
Note:
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at V
DD
= 3.3 V and 25
C
unless otherwise stated. Parameters are tested in production unless
otherwise stated.
4
Rev. 0.5
Si473x-B20
Table 2. Absolute Maximum Ratings
1,2
Parameter
Supply Voltage
Interface Supply Voltage
Input Current
3
Input Voltage
3
Operating Temperature
Storage Temperature
RF Input Level
4
Symbol
V
DD
V
IO
I
IN
V
IN
T
OP
T
STG
Value
–0.5 to 5.8
–0.5 to 3.9
10
–0.3 to (V
IO
+ 0.3)
–40 to 95
–55 to 150
0.4
Unit
V
V
mA
V
C
C
V
PK
Notes:
1.
Permanent device damage may occur if the above Absolute Maximum Ratings are exceeded. Functional operation
should be restricted to the conditions as specified in the operational sections of this data sheet. Exposure beyond
recommended operating conditions for extended periods may affect device reliability.
2.
The Si473x devices are high-performance RF integrated circuits with certain pins having an ESD rating of < 2 kV
HBM. Handling and assembly of these devices should only be done at ESD-protected workstations.
3.
For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, DFS, GPO1, GPO2, and GPO3.
4.
At RF input pins, FMI and AMI.
Rev. 0.5
5
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