Si4708/09-C
B
R O A DC A S T
F M R
A D I O
T
U N E R F O R
P
O R TA BL E
A
P P LI C A T I O N S
Features
GPO
NC
NC
Worldwide FM band support
(76–108 MHz)
Digital low-IF receiver
Frequency synthesizer with
integrated VCO
Adjustable seek tuning
Automatic frequency control
(AFC)
Automatic gain control (AGC)
Excellent overload immunity
Signal strength measurement
Programmable de-emphasis
(50/75 µs)
Adaptive noise suppression
Adjustable soft mute
Volume control
Line-level analog output
32.768 kHz reference clock
2-wire and 3-wire control
interface
2.7 to 5.5 V
D
supply voltage
2.7 to 5.5 V
A
supply voltage
Ordering Information:
See page 34.
Integrated LDO regulator allows
direct connection to battery
2.5 x 2.5 mm 16-pin QFN
package
Pb-free/RoHS
Pin Assignments
(Top View)
Si4708/09-GM
1
16
15
V
A
14
13
12
LOUT
ROUT
compliant
RDS/RBDS Processor (Si4709)
FMI
Applications
2
Cellular handsets
MP3 players
Portable radios
SDIO
Description
The Si4708/09 is the world's smallest FM broadcast receiver, integrating
the complete tuner function from antenna input to stereo audio output with
RDS (Si4709).
Functional Block Diagram
Headphone
Cable
FMI
RFGND
LNA
PGA
Q
ADC
I
ADC
DSP
DAC
ROUT
Si4708/09
DAC
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.
Notes:
1.
To ensure proper operation and FM
receiver performance, follow the
guidelines in
“AN350: Si4708/09
Antenna, Schematic, Layout, and
Design Guidelines"
and “AN383:
Si47xx Antenna Selection and
Universal Layout Guidelines.” Silicon
Laboratories will evaluate schematics
and layouts for qualified customers.
2.
Place Si4708/09 as close as possible
to antenna jack and keep the FMI
trace as short as possible.
AGC
32.768 kHz
0 / 90
LOW-IF
GPIO
GPO
VIO
CONTROL
INTERFACE
RCLK
VA
VD
TUNE
AFC
RDS
(Si4709)
RST
SDIO
SCLK
SEN
REG
RSSI
Rev. 1.2 10/10
Copyright © 2010 by Silicon Laboratories
CONTROLLER
AMPLIFIER
LOUT
Si4708/09-C
RCLK
SCLK
V
IO
Portable navigation
Consumer electronics
Mobile Internet
devices
USB FM radio
PDAs
Notebook PCs
Net PCs
RFGND
3
GND
PAD
11
GND
RST
SEN
4
5
6
7
8
10
9
V
D
Si4708/09-C
T
ABLE O F
C
ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.3. General Purpose Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4. RDS/RBDS Processor and Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5. Stereo Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.8. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.9. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.10. Audio Output Summation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.11. Initialization Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.12. Programming Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5. Register Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
6. Register Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7. Pin Descriptions: Si4708/09-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
9. Package Markings (Top Marks) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
9.1. Si4708 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.2. Si4709 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.3. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10. Package Outline: Si4708/09-GM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
11. PCB Land Pattern: Si4708/09-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
12. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Rev. 1.2
3
Si4708/09-C
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
Digital Supply Voltage
Analog Supply Voltage
Interface Supply Voltage
Ambient Temperature
Digital Power Supply Power-Up Rise Time
Analog Power Supply Power-Up Rise Time
Interface Power Supply Power-Up Rise Time
Symbol
V
D
V
A
V
IO
T
A
V
DRISE
V
ARISE
V
IRISE
Test Condition
Min
2.7
2.7
1.62
–20
10
10
10
Typ
—
—
—
25
—
—
—
Max
5.5
5.5
3.6
85
—
—
—
Unit
V
V
V
°C
µs
µs
µs
Note:
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at
V
D
=
V
A
= 3.3 V and 25 °C unless otherwise stated. Parameters are tested in production unless
otherwise stated.
Table 2. Absolute Maximum Ratings
1,2
Parameter
Digital Supply Voltage
Analog Supply Voltage
Interface Supply Voltage
Input Current
3
Input Voltage
3
Operating Temperature
Storage Temperature
RF Input Level
4
Symbol
V
D
V
A
V
IO
I
IN
V
IN
T
OP
T
STG
Value
–0.5 to 5.8
–0.5 to 5.8
–0.5 to 3.9
±10
–0.3 to (V
IO
+ 0.3)
–40 to 95
–55 to 150
0.4
Unit
V
V
V
mA
V
°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 Si4708/09 device is a high-performance RF integrated circuit with an ESD rating of < 2 kV HBM. Handling and
assembly of this device should only be done at ESD-protected workstations.
3.
For input pins SCLK, SEN, SDIO, RST, RCLK, and GPO.
4.
At RF input pins.
4
Rev. 1.2
Si4708/09-C
Table 3. DC Characteristics
(V
D
= V
A
= 2.7 to 3.6 V, V
IO
= 1.62 to 3.6 V, T
A
= –20 to 85 °C)
Parameter
FM Receiver to Line Output
V
DD
Supply Current
V
DD
Supply Current
1
V
DD
RDS Supply Current
2
Supplies and Interface
Interface Supply Current
Digital Powerdown Current
Analog Powerdown Current
V
IO
Powerdown Current
High Level Input Voltage
3
Low Level Input Voltage
3
High Level Input Current
3
Low Level Input Current
3
High Level Output Voltage
4
Low Level Output Voltage
4
Symbol
Test Condition
Min
Typ
Max
Unit
I
FM
I
FM
I
FM
Low SNR level
—
—
—
16.4
18.2
17
19.3
21.1
19.8
mA
mA
mA
I
IO
I
DDPD
I
APD
I
IOPD
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
V
IN
= V
IO
= 3.6 V
V
IN
= 0 V,
V
IO
= 3.6 V
I
OUT
= 500 µA
I
OUT
= –500 µA
Enable = 0
SCLK, RCLK inactive
—
—
—
—
0.7 x V
IO
–0.3
–10
–10
0.8 x V
IO
—
300
2.6
4.4
4.0
—
—
—
—
—
—
—
—
—
—
V
IO
+ 0.3
0.3 x V
IO
10
10
—
0.2 x V
IO
µA
µA
µA
µA
V
V
µA
µA
V
V
Notes:
1.
LNA is automatically switched to higher current mode for optimum sensitivity in weak signal conditions.
2.
Guaranteed by characterization.
3.
For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, DFS, GPO1, GPO2, and GPO3.
4.
For output pins SDIO, DOUT, GPO1, GPO2, and GPO3.
Rev. 1.2
5
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