Si4820/24-A10
B
R O A DC A S T
M
E C H A N I C A L
T
UN I N G
A M / F M / S W R
A D I O
R
E C E I V E R
Features
Worldwide FM band support
(64–109 MHz)
Worldwide AM band support
(504–1750 kHz)
SW band support (Si4824 only)
(5.6–22 MHz)
No manual alignment necessary
Mono audio output
Selectable support AM/FM/SW
regional bands
Automatic frequency control (AFC)
Integrated LDO regulator
2.0 to 3.6 V supply voltage
Wide range of ferrite loop sticks and
air loop antennas supported
24-pin SSOP
RoHS-compliant
Direct volume control
Not EN55020 compliant*
*Note:
For consumer applications that
require EN 55020 compliance,
use Si4831/35-B.
Ordering Information:
See page 14.
Applications
Table and portable radios
Mini/micro systems
CD/DVD players
Boom boxes
Pin Assignments
Modules
Clock radios
Mini HiFi
Entertainment systems
Si4820/24-A10 (SSOP)
LNA_EN
NC
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
AOUT
NC
DBYP
VDD2
VDD1
XTALI
XTALO
VOL-
VOL+
RST
GND
GND
Description
The Si4820/24-A10 is the entry level mechanical-tuned digital CMOS AM/FM/SW
radio receiver IC that integrates the complete receiver function from antenna input
to audio output. The Si4820/24-A10 extends Silicon Laboratories multi-band tuner
family, and further increases the ease and attractiveness of design radio reception
to audio devices through small size and board area, minimum component count,
and superior, proven performance. The Si4820/24-A10 is drop-in replaceable to
the existing Si4831/35 tuner, requires a simple application circuit, and removes
any requirements for manually tuning components during the manufacturing
process. It is a very simple product to design, manufacture, and support across
multiple product lines. The receiver has very low power consumption, runs off two
AAA batteries, and delivers the performance benefits of digital tuning to the
analog radio market.
Functional Block Diagram
Si4820/24
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
BAND
XTAL
OSC
LNA_EN
RST
TUNE1/2
ADC
DSP
DAC
AOUT
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 11/11
Copyright © 2011 by Silicon Laboratories
Si4820/24-A10
Si4820/24-A10
T
ABLE O F
C
ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.3. AM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
4.4. SW Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5. Frequency Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.6. Band Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
4.7. Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5. Pin Descriptions: Si4820/24-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7. Package Outline: Si4820/24-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8. PCB Land Pattern: Si4820/24-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
9. Top Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
9.1. Si4820/24-A10 Top Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
10. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Rev. 1.0
3
Si4820/24-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
Note:
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, T
A
= 0 to 70 °C)
Parameter
FM Mode
Supply Current
*
AM/SW Mode
Supply Current
*
Supplies and Interface
V
DD
Powerdown Current
Symbol
Test Condition
Min
Typ
Max
Unit
I
FM
—
21.0
—
mA
I
AM
—
17.0
—
mA
I
DDPD
—
10
—
µA
*Note:
Specifications are guaranteed by characterization.
4
Rev. 1.0
Si4820/24-A10
Table 3. Reset Timing Characteristics
(V
DD
= 2.7 to 3.6 V, TA = 0 to 70 °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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