Si4840-44 Data Short
Si4840/44
Broadcast Analog Tuning Digital Display AM/FM/SW Radio Receiver
Description
The Si4840/44 is the first analog-tuned digital-display
(ATDD) CMOS AM/FM/SW radio receiver IC that integrates
the complete receiver function from antenna input to audio
output. The Si4840/44 implements Silicon Labs' proven
low-IF digital architecture, providing an easy and reliable
control interface while eliminating all the manual tuned
external components used in traditional solutions. The
architecture also provides the industry's leading receiver
performance, with excellent sensitivity and selectivity in all
supported bands. The Si4840/44 uses a simple
potentiometer to provide an analog-tuning interface, and
outputs the highly-accurate tuned frequency to a
companion MCU / display driver via I2C-compatible, 2-wire
control interface. The device supports industry-leading
features for band selection, Bass/Treble boost, European
EN 55020/22 and U.S. FCC compliance, and advanced
audio conditioning for all signal environments to remove
pops, clicks, and abrasive static. The device also supports
interrupts for valid tuned frequencies and stereo/mono
signal quality. These features provide a superb and highly
reliable user experience. Like other successful audio
products from Silicon Labs, the Si4840/44 offers
unmatched integration and PCB space savings with
minimum external components and small board area on a
single side PCB. The high integration and complete system
production test simplifies design-in, increases system
quality, and improves manufacturability. The receiver has
very low power consumption, runs off two AAA batteries,
and delivers the performance benefits of high performance
digital radio effect with digital display to the legacy analogtuned radio market.
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/SW regional bands
- 2-wire control interface
- Flexible Mono/Stereo control and programmability
- Digital volume control support
- Excellent real-world performance
- Automatic frequency control (AFC)
- EN55020 compliant
- Minimal BOM components with no manual alignment
- Two AAA batteries with 2.0 to 3.6 V supply voltage
- Wide range of ferrite loop sticks and air loop antennas
- 24-pin SSOP package
- RoHS compliant
Applications
- Table and portable radios
- Stereos
- Mini/micro systems
- Boomboxes
- Clock radios
- Modules
- Entertainment systems
- Toys, lamps, and any application needing an AM/FM
radio
Si484x
Si4830/34
ADC
AMI
AM
ANT
RFGND
LNA
FMI
LOUT
DAC
ROUT
DSP
ADC
FM
ANT
DAC
AGC
0/90
TUNE1/2
ADC
BAND
AFC
AM/FM/SW Receiver
RST
XTAL
OSC
IRQ
REG
SDIO
2.0~3.6V VDD1/2
CONTROL
INTERFACE
SCLK
XTALI
Copyright © 2011 by Silicon Laboratories
6.13.2011
Si4840/44
Broadcast Analog Tuning Digital Display AM/FM/SW Radio Receiver
Selected FM Electrical Specifications
Parameter
Symbol
Input Frequency
Conditions
fRF
Sensitivity
(S+N)/N = 26 dB
Input IP3
Min
Typ
Max
Units
64
—
109
MHz
—
2.2
—
µV EMF
—
105
—
dBµV EMF
Adjacent Channel Selectivity
±200 kHz
—
50
—
dB
Alternate Channel Selectivity
±400 kHz
—
65
—
dB
Audio Output Voltage
—
80
—
mVRMS
Audio S/N
—
55
—
dB
Audio THD
—
0.1
0.5
%
Units
Selected AM Electrical Specifications
Parameter
Symbol
Conditions
Min
Typ
Max
fRF
AM
504
—
1750
kHz
SW
2.3
—
28.5
MHz
(S+N)/N = 26 dB
—
30
—
µV EMF
Audio S/N
—
55
—
dB
Audio Output Voltage
—
60
—
mVRMS
—
0.1
0.5
%
180
—
450
μH
Input Frequency
Sensitivity
Audio THD
Antenna Inductance
Package Information
Pin Assignments
LNA_EN
1
24
LOUT
IRQ
2
23
ROUT
TUNE1
3
22
DBYP
TUNE2
4
21
VDD2
BAND
5
20
VDD1
NC
6
19
XTALI
NC
7
18
XTALO
FMI
8
17
SCLK
RFGND
9
16
SDIO
NC
10
15
RST
Max
NC
11
14
GND
AMI
12
13
GND
Table 1. Package Dimensions
Dimension
Min
Nom
Max
Dimension
A
—
—
1.75
e
A1
0.10
—
0.25
L
0.40
—
1.27
b
0.20
—
0.30
θ
0°
—
8°
c
0.10
—
0.25
D
8.65 BSC
Min
Nom
0.635 BSC
aaa
0.20
bbb
0.18
E
6.00 BSC
ccc
0.10
E1
3.90 BSC
ddd
0.10
Notes:
1.
2.
3.
4.
All dimensions shown are in millimeters (mm) unless otherwise noted.
Dimensioning and Tolerancing per ANSI Y14.5M-1994.
This drawing conforms to the JEDEC Solid State Outline MO-137, Variation
AE.
Recommended card reflow profile is per the JEDEC/IPC J-STD-020
specification for Small Body Components.
AM/FM/SW Receiver
Copyright © 2011 by Silicon Laboratories
6.13.2011
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders
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using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific
device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories
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