SI4844-B20 Datasheet, PDF (1/27 Pages) Silicon Laboratories – BROADCAST ANALOG TUNING DIGITAL DISPLAY AM/FM/SW RADIO RECEIVER

Si4844-B20
BROADCAST ANALOG TUNING DIGITAL DISPLAY
AM/FM/SW RADIO RECEIVER
Features
 Worldwide FM band support
(64–109 MHz)
 Worldwide AM band support
(504–1750 kHz)
 SW band support
(2.3–28.5 MHz)
 Selectable support for all AM/FM
regional bands
 Enhance FM/SW band coverage
 2-wire control interface
 Mono/Stereo and valid station
indicator
 Digital volume support
Applications
 Table and portable radios
 Stereos
 Mini/micro systems
 Boom boxes
 Clock radios
Description
 Bass/Treble support
 Minimal BOM components with no
manual alignment
 Excellent real-world performance
 China TV channels audio carrier
reception in FM band
 EN55020 compliant
 Two AAA batteries with 2.0 to 3.6 V
supply voltage
 Wide range of ferrite loop sticks and
air loop antenna support
 24-pin SSOP package
 RoHS compliant
 Modules for consumer electronics
 Entertainment systems
 Toys, lamps, and any application
needing an AM/FM/SW radio
 Mini HiFi
 iPhone docking
The Si4844-B is the analog-tuned digital-display digital CMOS AM/FM/SW radio
receiver IC that integrates the complete receiver function from antenna input to audio
output. Working with the host MCU (I²C-compatible 2-wire control interface),
frequencies and stereo/mono information can be displayed on LCD while the analog-
tune features are kept. Si4844-B is pin-to-pin compatible with the current Si484x-A
tuner. Sharing all the advanced features of the Si484x-A, Si4844-B can support a wider
range of FM and SW bands. The Si4844-B also supports China TV channels audio
reception in FM band. The superior control algorithm integrated in the Si4844-B
provides a easy and reliable control interface while eliminating all the manual-tuned
external components used in a traditional solution.
Functional Block Diagram
AM
ANT
FM
ANT
AMI
RFGND
FMI
XTALI
2.0~3.6V VDD1/2
LNA
AGC
0/90
AFC
REG
XTAL
OSC
Si^S48ⁱ⁴3⁸0⁴/⁴3^-4^B
ADC
DAC
DSP
ADC
DAC
LOUT
ROUT
ADC
CONTROL INTERFACE
TUNE1/2
BAND
Ordering Information:
See page 21.
Pin Assignments
Si4844-B20 (SSOP)
LNA_EN
1
IRQ
2
TUNE1
3
TUNE2
4
BAND
5
NC
6
NC
7
FMI
8
RFGND
9
NC
10
NC
11
AMI
12
24
LOUT
23
ROUT
22
DBYP
21
VDD2
20
VDD1
19
XTALI
18
XTALO
17
SCLK
16
SDIO
15
RST
14
GND
13
GND
This product, its features, and/or its
architecture is covered by one or more of
the following patents, as well as other
patents, pending and issued, both
foreign and domestic: 7,127,217;
7,272,373; 7,272,375; 7,321,324;
7,355,476; 7,426,376; 7,471,940;
7,339,503; 7,339,504.
Rev. 1.0 5/13
Copyright © 2013 by Silicon Laboratories
Si4844-B20