SI4736-B20 Datasheet, PDF (1/38 Pages) Silicon Laboratories – BROADCAST WEATHER BAND RADIO RECEIVER

Si4736/37/38/39-B20
BROADCAST WEATHER BAND RADIO RECEIVER
Features
 NOAA weather band support (162.4–  No manual alignment necessary
162.55 MHz)
 Programmable reference clock
 Worldwide FM band support
 Volume control
s _{(76–108 MHz)}
 Programmable soft mute control
n  Worldwide AM band support
 Programmable de-emphasis
ig ^{(520–1710 kHz) (Si4736/37 only)}
 RDS/RBDS processor (Si4737/39
 1050 Hz alert tone detection
only)
es ^{0  Excellent real-world performance}
 Optional digital audio output (Si47/39
4 ^{ Freq synthesizer with integrated VCO only)}
 Advanced AM/FM seek tuning
 Optional digital audio output
D _{-C  Automatic frequency control (AFC)}
(Si4737/39 only)
 Automatic gain control (AGC)
 2-wire and 3-wire control interface
w _{9  Integrated LDO regulator}
 2.7 to 5.5 V supply voltage
Ne ^{/3  Digital FM stereo decoder}
 Firmware upgradeable
 Adaptive noise suppression
 3 x 3 x 0.55 mm 20-pin QFN package
8 _{ AM/FM/WB digital tuning}
 Pb-free/RoHS compliant
Ordering Information:
See page 30.
Pin Assignments
Si4736/37/38/39-GM
(Top View)
for ^{/3 Applications}
d _/37 ^{ Emergency radios}
 Table and portable radios
e _{6  Stereos}
d _{3  Mini/micro systems}
n ₇  Portable media players
 Boom boxes
 Cellular handsets
 Modules
 Clock radios
 Mini HiFi
e _{i4 Description}
m _{S The Si4736/37/38/39 is the first digital CMOS AM/FM/WB radio receiver IC that}
m integrates the complete tuner function from antenna input to audio output.
NC 1
FMI 2
RFGND 3
AMI 4
RST 5
6
20 19 18 17 ₁₆
15 DOUT
GND
PAD
14 LOUT
13 ROUT
12 GND
7 8 9 10 ^{11 VDD}
co ^{se Functional Block Diagram}
Re ^{e u} _AMI
t ^{s AM}
o ^{a ANT}
RFGND
LNA
N ^leAGC
P ^FM/
Si473x
RDS
(Si4737/
39)
LOW-IF
DIGITAL
AUDIO
(Si4737/
39)
DOUT
DFS
GPO/DCLK
ADC
DAC
ROUT
Patents pending
Notes:
1. To ensure proper operation and
receiver performance, follow the
guidelines in “AN383: Universal
Antenna Selection and Layout
WB
ANT
FMI
LNA
DSP
Guidelines.” Silicon Laboratories will
evaluate schematics and layouts for
AGC
ADC
DAC
LOUT
qualified customers.
2. Place Si4736/37/38/39 as close as
2.7– 5.5 V
VDD
GND
LDO
AFC
CONTROL
INTERFACE
VIO
1.5–3.6 V
possible to antenna jack and keep
the FMI and AMI traces as short as
possible.
Rev. 1.0 4/08
Copyright © 2008 by Silicon Laboratories
Si4736/37/38/39-B20