Si4840/44-A10
B
R O A D C A S T
A
N A L O G
T
U N I NG
D
I G I TA L
D
IS PLAY
A M/ FM / S W
R
A D I O
R
E C E IV E R
Features
Worldwide FM band support
(64–109 MHz)
Worldwide AM band support
(504–1750 kHz)
SW band support (Si4844 only)
(2.3–28.5 MHz)
Selectable support for all AM/FM
regional bands
2-wire control interface
Mono/Stereo and valid station
indicator
Digital volume support
Bass/Treble support
Minimal BOM components with no
manual alignment
Excellent real-world performance
Automatic frequency control (AFC)
EN55020 compliant
Two AAA batteries with 2.0 to 3.6 V
supply voltage (T = 25 °C)
Wide range of ferrite loop sticks and
air loop antenna support
24-pin SSOP package
RoHS compliant
Ordering Information:
See page 20.
Applications
Pin Assignments
Table and portable radios
Stereos
Mini/micro systems
Boom boxes
Clock radios
Modules for consumer electronics
Entertainment systems
Toys, lamps, and any application
needing an AM/FM radio
Mini HiFi
iPhone docking
Si4840/44-A10 (SSOP)
LNA_EN
IRQ
TUNE1
TUNE2
BAND
NC
NC
FMI
RFGND
NC
NC
AMI
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
LOUT
ROUT
DBYP
VDD2
VDD1
XTALI
XTALO
SCLK
SDIO
RST
GND
GND
Description
The Si4840/44 is the first 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 Host MCU (I
2
C-compatible 2-wire control interface),
frequencies, and stereo/mono information can be displayed on LCD, while the
analog-tune features are kept. Leveraging Silicon Laboratories' proven and
patented digital low intermediate frequency (low-IF) receiver architecture, the
Si4840/44 deliver superior RF performance and interference rejection. The
superior control algorithm integrated in Si4840/44 provides easy and reliable
control interface while eliminating all the manual tuned external components used
in traditional solution.
Functional Block Diagram
Si484x
Si4830/34
AMI
AM
ANT
FM
ANT
RFGND
LNA
ADC
AGC
0/90
ADC
XTALI
2.0~3.6V VDD1/2
REG
AFC
CONTROL INTERFACE
XTAL
OSC
SCLK
SDIO
RST
IRQ
BAND
TUNE1/2
ADC
DSP
DAC
ROUT
DAC
LOUT
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.
FMI
Rev.1.0 8/11
Copyright © 2011 by Silicon Laboratories
Si4840/44-A10
Si4840/44-A10
T
ABLE
Section
OF
C
ONTENTS
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.3. AM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.4. SW Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5. Frequency Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.6. Band Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.7. Bass and Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.8. Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.9. Stereo Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.10. Stereo DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.11. Soft Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.12. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.13. Memorizing Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.14. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.1. Si4840/44-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8. Package Outline: Si4840/44-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9. PCB Land Pattern: Si4840/44-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10. Top Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
10.1. Si4840/44-A10 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
Rev.1.0
3
Si4840/44-A10
1. Electrical Specifications
Table 1. Recommended Operating Conditions
1,2
Parameter
Supply Voltage
3
Power Supply Powerup Rise Time
Symbol
V
DD
V
DDRISE
Test Condition
Min
2
10
Typ
—
—
Max
3.6
—
Unit
V
µs
Notes:
1.
Typical values in the data sheet apply at V
DD
= 3.3 V and 25 °C unless otherwise stated.
2.
All minimum and maximum specifications in the data sheet apply across the recommended operating conditions for
minimum V
DD
= 2.7 V.
3.
Operation at minimum V
DD
is guaranteed by characterization when V
DD
voltage is ramped down to 2.0 V. Part
initialization may become unresponsive below 2.3 V.
Table 2. DC Characteristics
(V
DD
= 2.7 to 3.6 V, TA = –15 to 85 °C)
Parameter
FM Mode
Supply Current
1
Supply Current
2
AM/SW Mode
Supply Current
1
Supplies and Interface
V
DD
Powerdown
Current
Symbol
Test Condition
Min
Typ
Max
Unit
I
FM
I
FM
I
AM
I
DDPD
Low SNR level
—
—
21.0
21.5
—
—
mA
mA
—
17.0
—
mA
—
10
—
µA
Notes:
1.
Specifications are guaranteed by characterization.
2.
LNA is automatically switched to higher current mode for optimum sensitivity in weak signal conditions.
4
Rev.1.0
Si4840/44-A10
Table 3. Reset Timing Characteristics
(V
DD
= 2.7 to 3.6 V, TA = –15 to 85 °C)
Parameter
RST Pulse Width
Symbol
t
SRST
Min
100
Typ
—
Max
—
Unit
µs
t
SRST
70%
30%
RST
Figure 1. Reset Timing
Rev.1.0
5
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