Si 4 8 2 7 - A1 0
B
ROADCAST
A
N A L O G
T
UNING
D
IGITAL
D
ISPLAY
AM/FM/SW R
ADIO
R
ECEIVER
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/SW
regional bands
Enhanced FM/SW band coverage
2-wire control interface
Mono output
Valid station indicator
Digital volume support
Bass/Treble support
Minimal BOM components with no
manual alignment
Excellent real-world performance
China TV channels audio carrier
reception in FM band
2.0 to 3.6 V supply voltage
Wide range of ferrite loop sticks and
air loop antenna support
16-pin SOIC package
RoHS compliant
Not EN55020 compliant *
*Note: For consumer applications that
require EN 55020 compliance, use
Si4844-B.
Ordering Information:
See page 19.
Pin Assignments
Si4827-A10 (SOIC)
Applications
Table and portable radios
Boom boxes
Clock radios
Modules for consumer electronics
Toys, lamps, and any application
needing an AM/FM/SW radio
IRQ
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/LNA_EN
SCLK
SDIO
RST
Description
The Si4827 is an entry level 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 information can be displayed on LCD while the analog-tune features
are kept. The Si4827 enhances the FM and SW band coverage, and further
supports China TV channels audio reception in FM band. The superior control
algorithm integrated in the Si4827 provides an easy and reliable control interface
while eliminating all the manual tuned external components used in traditional
solutions.
Functional Block Diagram
Si4827
Si4830/34
AMI
AM
ANT
FM
ANT
RFGND
LNA
ADC
AGC
FMI
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.
SCLK
SDIO
IRQ
Rev. 1.0 5/13
Copyright © 2013 by Silicon Laboratories
RST
Si4827-A10
Si4827-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. High Fidelity DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.10. Soft Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.11. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.12. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.13. Memorizing Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.14. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6. Pin Descriptions: Si4827-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8. Package Outline: Si4827-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9. PCB Land Pattern: Si4827-A10 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10. Top Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10.1. Si4827-A10 Top Marking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10.2. Top Marking Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
Rev. 1.0
3
Si4827-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
2.0
10
0
Typ
—
—
25
Max
3.6
—
70
Unit
V
µs
°C
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 = 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
I
AM
I
DDPD
—
21.0
—
mA
—
20.0
—
mA
—
10
—
µA
*Note:
Specifications are guaranteed by characterization.
4
Rev. 1.0
Si4827-A10
Table 3. Reset Timing Characteristics
(V
DD
= 2.7 to 3.6 V, TA = 0 to 70 °C)
Parameter
RSTB Pulse Width
2-wire Bus Idle Time After RSTB Rises
2-wire Bus Idle Time Before RSTB Rises, and VDD Valid
Time Before RSTB Rises
RSTB Low Time Before VDD Becomes Invalid
Notes:
Symbol
t
PRST
t
SDIO
t
SRST
t
RRST
Min
100
100
100
0
Typ
—
—
—
—
Max
—
—
—
—
Unit
µs
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
VDD
t
SDIO
t
PRST
t
SDIO
t
RRST
RSTB
SCLK
POWER_UP
Normal
Operation
POWER_UP
Normal
Operation
SDIO
Figure 1. Reset Timing
Rev. 1.0
5
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