Rev. 1.0 12/09 Copyright © 2009 by Silicon Laboratories Si4704/05-C40
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Si4704/05-C40
BROADCAST FM RADIO RECEIVER FOR CONSUMER
E
LECTRONICS
Features
Applications
Description
The Si4704/05 integrates all functions required for an advanced broadcast FM
radio receiver, from antenna input to stereo audio output.
Functional Block Diagram
Worldwide FM band support
(64–108 MHz)
Integrated antenna support
EN55020 compliant
Excellent real-world performance
Freq synthesizer with integrated VCO
Advanced FM seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Digital FM stereo decoder
Minimal BOM
Programmable de-emphasis
Programmable reference clock
Volume control
Adjustable soft mute control
RDS/RBDS processor (Si4705)
Optional digital audio out (Si4705)
2-wire and 3-wire control interface
Integrated LDO regulator
Signal quality measurements
2.7 to 5.5 V supply voltage
3x3 mm 20-pin QFN package
RoHS compliant
Table and portable radios
Stereos
Mini/micro systems
CD/DVD players
Boom boxes
Modules
Clock radios
Mini HiFi
Entertainment systems
ADC
ADC
Si4704/05
DSP
DAC
DAC
ROUT
LOUT
AFC
DIGITAL INTERFACE
(Si4705)
GPO
RFGND
LNA
FMI
AGC
PGA
RCLK
REG
VDD
2.7–5.5 V
FM Antenna
XTAL
OSC
LPI
32.768 kHz
0/90
DOUT
DCLK
DFS
VIO
1.85-3.6 V
SCLK
SDIO
CONTROL
INTERFACE
SEN
RSSI
RST
RDS
(Si4705)
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.
Ordering Information:
See page 28.
Pin Assignments
GND
PAD
1
2
3
17181920
11
12
13
14
6
7 8 9
4
5
16
10
15
GPO2/INT
VIO
DOUT
LOUT
ROUT
GNDRST
NC
LPI
RCLK
SDIO
VDD
FMI
RFGND
GPO3/DCLK
NC
GPO1
DFS
SCLK
SEN
Si4704/05-GM (Top View)
Si4704/05-C40
2 Rev. 1.0
Si4704/05-C40
Rev. 1.0 3
TABLE OF CONTENTS
Section Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.2. Application Schematics and Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.3. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.4. Digital Audio Interface (Si4705 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
4.5. Stereo Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.6. De-emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.7. Stereo DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.8. Soft Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.9. RDS/RBDS Processor (Si4705 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
4.10. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.11. Seek . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.12. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.13. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
4.14. GPO Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.15. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
4.16. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25
6. Pin Descriptions: Si4704/05-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . .28
8. Package Markings (Top Marks) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
8.1. Si4704 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
8.2. Si4705 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
8.3. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
9. Package Outline: Si4704/05-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
10. PCB Land Pattern: Si4704/05-C40-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

SI4705-C40-GM

Mfr. #:
Manufacturer:
Silicon Labs
Description:
Tuners Si4705 rev C FM Radio Tuner w/ RDS/RBDS, dig out, internal antenna 3x3x0.55 20-pin QFN, lead free
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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