Si4704/05-D50
B
ROADCAST
F M R
ADIO
R
ECEIVER
E
LECTRONICS
Features
FOR
C
ON SUMER
Worldwide FM band support
(64–108 MHz)
RDS/RBDS decoding engine
(Si4705 only)
Lowest power consumption
Received signal quality indicators
On-chip tuned resonance for
embedded antenna support
Multipath detection and mitigation
FM Hi-cut control
Advanced FM stereo-mono blend
Advanced audio processing
Not EN 55020 compliant*
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
Dual 1.8 and 2.7 V power supplies
Stereo audio out
Ordering Information:
See page 27.
I
2
S Digital audio out
20-pin 3 x 3 mm QFN package
Pb-free/RoHS compliant
Pin Assignments
Si4704/05-GM
*Note:
*For consumer electronics applications that require EN 55020 compliance,
use Si4704/05-D60.
(Top View)
GPO3/DCLK
VD
GPO2/INT
GPO1
Applications
Cellular handsets
Portable media devices
Dedicated data receiver
Personal navigation devices (PND)
GPS-enabled handsets and portable
devices
NC 1
FMI 2
RFGND 3
20 19 18 17 16
15 DOUT
Description
The Si4704/05-D50 FM/RDS/RDBS receivers provide the highest performance
and lowest power consumption 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.
LPI 4
RST 5
6
SEN
7
SCLK
GND
PAD
8
SDIO
9
RCLK
10 11 VA
Functional Block Diagram
FM Antenna
FMI
RFGND
LNA
PGA
ADC
AGC
0/90
RSSI
AFC
RDS
(Si4705)
DIGITAL INTERFACE
ADC
DSP
DAC
ROUT
GPO
DCLK
DOUT
DFS
Si4704/05
DAC
LOUT
LPI
32.768 kHz (TYP)
RCLK
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.
2.7–5.5 V
VA
REG
XTAL
OSC
SEN
CONTROL
INTERFACE
Rev. 1.0 12/10
Copyright © 2010 by Silicon Laboratories
VD
1.62–3.6 V
SCLK
SDIO
RST
Si4704/05-D50
DFS
14 LOUT
13 ROUT
12 GND
NC
Si4704/05-D50
T
ABLE
Section
OF
C
ONTENTS
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. Volume Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.7. Stereo DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.8. Soft Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.9. FM Hi-Cut Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.10. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.11. Seek . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.12. Digital Audio Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.13. Embedded Antenna Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.14. RDS Decoder (Si4705 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.15. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.16. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.17. GPO Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.18. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.19. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
6. Pin Descriptions: Si4704/05-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
8. Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.1. Si4704 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.2. Si4705 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8.3. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
9. Package Outline: Si4704/05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10. PCB Land Pattern: Si4704/05 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Document Change List: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Rev. 1.0
3
Si4704/05-D50
1. Electrical Specifications
Table 1. Recommended Operating Conditions*
Parameter
Analog Supply Voltage
Digital and Interface Supply Voltage
Analog Power Supply Powerup Rise
Time
Digital Power Supply Powerup Rise
Time
Ambient Temperature
Symbol
V
A
V
D
V
ARISE
V
DRISE
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
*Note:
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at 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
Analog Supply Voltage
Digital and Interface Supply Voltage
Input Current
3
Input Voltage
3
Operating Temperature
Storage Temperature
RF Input Level
4
Symbol
V
A
V
D
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 Si4704/05 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 DFS, SCLK, SEN, SDIO, RST, RCLK, GPO1, GPO2, GPO3, and DCLK.
4.
At RF input pins FMI and LPI.
4
Rev. 1.0
Si4704/05-D50
Table 3. DC Characteristics
(V
A
= 2.7 to 5.5 V, V
D
= 1.62 to 3.6 V, T
A
= –20 to 85 °C)
Parameter
FM Receiver to Line Output
V
A
Supply Current
V
D
Supply Current
V
D
Supply Current
Powerdown and Interface
V
A
Powerdown Current
V
D
Powerdown Current
High Level Input Voltage
2
Low Level Input Voltage
2
High Level Input Current
2
Low Level Input Current
2
High Level Output Voltage
3
Low Level Output Voltage
3
Symbol
Test Condition
Min
Typ
Max
Unit
I
FMVA
I
FMVD
I
FMVD
Digital Output Mode
1
Analog Output Mode
—
—
—
7.5
8.5
8.4
9.7
11.1
11.1
mA
mA
mA
I
DDPD
I
IOPD
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
V
IN
= V
D
= 3.6 V
V
IN
= 0 V,
V
D
= 3.6 V
I
OUT
= 500 µA
I
OUT
= –500 µA
SCLK, RCLK inactive
—
—
0.7 x V
D
–0.3
–10
–10
0.8 x V
D
—
4
3
—
—
—
—
—
—
15
10
V
D
+ 0.3
0.3 x V
D
10
10
—
0.2 x V
D
µA
µA
V
V
µA
µA
V
V
Notes:
1.
Guaranteed by characterization.
2.
For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, DFS, GPO1, GPO2, and GPO3.
3.
For output pins SDIO, DOUT, GPO1, GPO2, and GPO3.
Rev. 1.0
5
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