Si 4 8 2 5 - A1 0
B
R O A D C A S T
M
E C H A N I C A L
T
U N I N G
A M / F M / S W R
A D I O
R
EC EIVER
Features
Worldwide FM band support
(64–109 MHz)
Worldwide AM band support
(504–1750 kHz)
SW band support
(2.3–28.5 MHz)
No manual alignment necessary
Mono audio output
Selectable support AM/FM/SW
regional bands
Enhanced FM/SW band coverage
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
16-pin SOIC
RoHS-compliant
Direct volume control
Not EN55020 compliant*
*Note:
For consumer applications that
require EN 55020 compliance,
use Si483x.
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
Si4825-A10 (SOIC)
LNA_EN
TUNE1
TUNE2
BAND
NC
FMI
RFGND
AMI
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AOUT
GND
VDD
XTALI
XTALO
VOL-
VOL+
RST
Description
The Si4825 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 Si4825 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 Si4825 requires a simple application circuit
and removes any requirements for manually tuning components during the
manufacturing process. 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
Si4825
Si4830/34
AMI
AM
ANT
FM
ANT
RFGND
LNA
ADC
AGC
0/90
ADC
XTALI
2.0~3.6V
VDD
REG
AFC
CONTROL INTERFACE
BAND
XTAL
OSC
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
LNA_EN
Rev. 1.0 5/13
Copyright © 2013 by Silicon Laboratories
VOL+/-
RST
Si4825
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Si4825-A10
T
ABLE
Section
OF
C
ONTENTS
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
4.8. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5. Pin Descriptions: Si4825-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7. Package Outline: Si4825-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8. PCB Land Pattern: Si4825-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9. Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1. Si4825-A10 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
9.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
10. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
Rev. 1.0
3
Si4825-A10
1. Electrical Specifications
Table 1. Recommended Operating Conditions
1,2
Parameter
Supply Voltage
3
Power Supply Powerup Rise Time
Ambient Temperature Range
Symbol
V
DD
V
DDRISE
T
A
Test Condition
Min
2
10
0
Typ
—
—
25
Max
3.6
—
70
Unit
V
µs
°C
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
—
20.0
—
mA
I
AM
—
19.0
—
mA
I
DDPD
—
10
—
µA
*Note:
Specifications are guaranteed by characterization.
4
Rev. 1.0
Si4825-A10
Table 3. Reset Timing Characteristics
(V
DD
= 2.7 to 3.6 V, TA = 0 to 70 °C)
Parameter
RSTB Pulse Width
VDD valid time before RSTB rises
RSTB low time before VDD becomes invalid
Notes:
Symbol
t
PRST
t
SRST
t
RRST
Min
100
100
0
Typ
—
—
—
Max
—
—
—
Unit
µs
µs
µs
1.
RSTB must be held low for at least 100 µs after the voltage supply has been ramped up.
2.
RSTB needs to be asserted (pulled low) prior to the supply voltage being ramped down.
t
SRST
t
PRST
t
RRST
VDD
RSTB
Figure 1. Reset Timing
Rev. 1.0
5
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