Si4831/35-B30
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 (Si4835 only)
(5.6–22 MHz)
Excellent real-world performance
EN55020-compliant
No manual alignment necessary
Flexible band selections
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
Supports station and stereo LED
indicators
Direct volume control
Bass and treble tone control
Ordering Information:
See page 13.
Applications
Table and portable radios
Stereos
Mini/micro systems
CD/DVD players
Boom boxes
Modules
Clock radios
Mini HiFi
Entertainment systems
Pin Assignments
Si4831/35-B30 (SSOP)
STEREO
STATION
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
VOL-/BASS
VOL+/TREBLE
RST
GND
GND
Description
The Si4831/35-B30 is the 2nd generation mechanical-tuned digital CMOS
AM/FM/SW radio receiver IC that integrates the complete receiver function from
antenna input to audio output. Like other successful audio products from Silicon
Labs, Si4831/35-B30 offers unmatched integration and PCB space savings with
minimum external components and a small board area. The Si4831/35-B30
requires a simple application circuit and removes any requirements for manually
tuning components during the manufacturing process. The Si4831/35-B30 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
Si4831/35
Si4830/34
AM
ANT
FM/SW
ANT
AMI
RFGND
LNA
ADC
AGC
0/90
ADC
XTALI
2.0~3.6V VDD1/2
REG
AFC
CONTROL
INTERFACE
XTAL
OSC
VOL/TONE
STATION
STEREO
RST
BAND
TUNE 1/2
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 1/11
Copyright © 2011 by Silicon Laboratories
Si4831/35-B30
Si4831/35-B30
T
ABLE
Section
OF
C
ONTENTS
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
4.3. AM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.4. SW Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5. Frequency Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.6. Band Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.7. Bass and Treble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
4.8. Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. Pin Descriptions: Si4831/35-B30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
6. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7. Package Markings (Top Marks) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7.1. Si4831/35-B30 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
7.2. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
8. Package Outline: Si4831/35-B30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
9. PCB Land Pattern: Si4831/35-B30 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
10. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
Rev. 1.0
3
Si4831/35-B30
1. Electrical Specifications
Table 1. Recommended Operating Conditions
1,2
Parameter
Supply Voltage
3
Power Supply Powerup Rise Time
Ambient Temperature
Symbol
V
DD
V
DDRISE
T
A
Test Condition
Min
2
10
–15
Typ
—
—
25
Max
3.6
—
85
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. Absolute Maximum Ratings
1,2
Parameter
Supply Voltage
Input Current
3
Operating Temperature
Storage Temperature
RF Input Level
4
Symbol
V
DD
I
IN
T
OP
T
STG
Value
–0.5 to 5.8
10
–40 to 95
–55 to 150
0.4
Unit
V
mA
C
C
V
PK
Notes:
1.
Permanent device damage may occur if the above Absolute Maximum Ratings are exceeded. Functional operation
should be restricted to the conditions as specified in the operational sections of this data sheet. Exposure beyond
recommended operating conditions for extended periods may affect device reliability.
2.
The Si4831/35-B30 devices are high-performance RF integrated circuits with certain pins having an ESD rating of
< 2 kV HBM. Handling and assembly of these devices should only be done at ESD-protected workstations.
3.
For input pins RST, VOL+/TREBLE, VOL–/BASS, XTALO, XTALI, BAND, TUNE2, TUNE1, STATION, and STEREO.
4.
At RF input pins, FMI and AMI.
4
Rev. 1.0
Si4831/35-B30
Table 3. DC Characteristics
(V
DD
= 2.7 to 3.6 V, T
A
= –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
Low SNR level
—
—
21.0
21.5
—
—
mA
mA
I
AM
—
17.0
—
mA
I
DDPD
—
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.
Table 4. Reset Timing Characteristics
(V
DD
= 2.7 to 3.6 V, TA = –15 to 85 °C)
Parameter
RST Pulse Width and TUNE1, TUNE2 Setup to RST
TUNE1, TUNE2 Hold from RST
Symbol
t
SRST
t
HRST
t
HRST
Min
100
30
Typ
—
—
Max
—
—
Unit
µs
ns
t
SRST
RST
70%
30%
TUNE1
70%
30%
TUNE2
70%
30%
Figure 1. Reset Timing
Rev. 1.0
5
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