Si 4 7 0 6 - C3 0
H
I G H
- P
ERFORMANCE
FM RDS/RBDS R
ECEIVER
Note:
The Si4706-C30 requires a patch for production operation. See section
“11. Additional Reference Resources”
Features
GPO3/DCLK
VIO
Worldwide FM band support
(76–108 MHz)
Advanced patented RDS/RBDS
decoding engine
Outstanding RDS sensitivity
Leading RDS synchronization
metrics
Highly reliable RDS decoder
RDS reception with FM mono
broadcast
Received signal quality indicators
On-chip tuned resonance for
embedded antenna support
FM multi-path detection and
mitigation
FM Hi-cut control
Advanced FM stereo-mono blend
Automatic gain control (AGC)
Integrated FM LNA
Image-rejection mixer
Frequency synthesizer with
integrated VCO
Low-IF direct conversion with no
external ceramic filters
2.7 to 5.5 V supply voltage
Programmable reference clock
Stereo audio out
Ordering Information:
See page 29.
Pin Assignments
Si4706-GM
(Top View)
GPO2/INT
I
2
S Digital audio out
20-pin 3 x 3 mm QFN package
Pb-free/RoHS compliant
GPO1
Applications
NC 1
20 19 18 17 16
15 DOUT
Cellular handsets
Portable media devices
In-car navigation systems
Dedicated data receiver
Personal navigation devices (PND)
GPS-enabled handsets and portable
devices
FMI 2
RFGND 3
LPI 4
RST 5
6
SEN
7
SCLK
8
SDIO
9
RCLK
GND
PAD
Description
The high-performance Si4706-C30 FM RDS receiver provides the most advanced
and flexible audio and RDS data processing available for portable devices today.
The 100% CMOS IC integrates the complete FM and data receiver function from
antenna to analog or digital audio and data out in a single 3 x 3 mm 20-pin QFN.
10 11 VDD
Functional Block Diagram
Half-wavelength
antenna
Si4706
ADC
LNA
PGA
ADC
AGC
0/90
DIGITAL INTERFACE
DSP
DAC
ROUT
GPO
DCLK
DOUT
DFS
DAC
LOUT
FMI
Embedded
antenna
LPI
RFGND
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.
32.768 kHz (TYP)
RCLK
2.7–5.5 V
VDD
RSSI
AFC
RDS
REG
XTAL
OSC
SEN
CONTROL
INTERFACE
SCLK
SDIO
RST
Rev. 1.0 7/09
Copyright © 2009 by Silicon Laboratories
VIO
Silicon Laboratories Confidential. Information contained herein is covered under non-disclosure agreement (NDA).
DFS
14 LOUT
13 ROUT
12 GND
NC
Si4706-C30
Si4706-C30
T
ABLE O F
C
ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.3. Stereo Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4. Received Signal Qualifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.5. De-emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6. Stereo DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.7. Soft Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8. FM Hi-Cut Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.9. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.10. Seek . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.11. Digital Audio Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.12. Embedded Antenna Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.13. RDS Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.14. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.15. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.16. GPO Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.17. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.18. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6. Pin Descriptions: Si4706-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8. Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.1. Si4706 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.2. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
9. Package Outline: Si4706 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10. PCB Land Pattern: Si4706 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
Rev. 1.0
3
Si4706-C30
1. Electrical Specifications
Table 1. Recommended Operating Conditions
1
Parameter
Supply Voltage
Interface Supply Voltage
2
Power Supply Powerup Rise Time
Interface Power Supply Powerup
Rise Time
Ambient Temperature
Symbol
V
DD
V
IO
V
DDRISE
V
IORISE
T
A
Test Condition
Min
2.7
1.62
10
10
–20
Typ
—
—
—
—
25
Max
5.5
3.6
—
—
85
Unit
V
V
µs
µs
C
Notes:
1.
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at V
DD
= 3.3 V and 25
C
unless otherwise stated. Parameters are tested in production unless
otherwise stated.
2.
Operation with V
IO
< 2.0 V requires a patch. See section “11. Additional Reference Resources”.
Table 2. Absolute Maximum Ratings
1,2
Parameter
Supply Voltage
Interface Supply Voltage
Input Current
3
Input Voltage
3
Operating Temperature
Storage Temperature
RF Input Level
4
Symbol
V
DD
V
IO
I
IN
V
IN
T
OP
T
STG
Value
–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
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 Si4706 device is a high-performance RF integrated circuit 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 DFS, SCLK, SEN, SDIO, RST, RCLK, GPO1, GPO2, and GPO3.
4.
At RF input pins FMI and LPI.
4
Rev. 1.0
Si4706-C30
Table 3. DC Characteristics
(V
DD
= 2.7 to 5.5 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
Supplies and Interface
Interface Supply Current
V
DD
Powerdown Current
V
IO
Powerdown Current
High Level Input Voltage
1
Low Level Input Voltage
1
High Level Input Current
1
Low Level Input Current
1
High Level Output Voltage
2
Low Level Output Voltage
2
Symbol
Test Condition
Min
Typ
Max
Unit
I
FM
I
IO
I
DDPD
I
IOPD
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
Analog Output Mode
—
21.4
24
mA
—
—
SCLK, RCLK inactive
—
0.7 x V
IO
–0.3
V
IN
= V
IO
= 3.6 V
V
IN
= 0 V,
V
IO
= 3.6 V
I
OUT
= 500 µA
I
OUT
= –500 µA
–10
–10
0.8 x V
IO
—
400
10
1
—
—
—
—
—
—
600
20
10
V
IO
+ 0.3
0.3 x V
IO
10
10
—
0.2 x V
IO
µA
µA
µA
V
V
µA
µA
V
V
Notes:
1.
For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, DFS, GPO1, GPO2, and GPO3.
2.
For output pins SDIO, DOUT, GPO1, GPO2, and GPO3.
Rev. 1.0
5
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