Confidential Rev. 1.4 3/10 Copyright © 2010 by Silicon Laboratories Si4708/09-B
Silicon Laboratories Confidential. Information contained herein is covered under non-disclosure agreement (NDA).
Si4708/09-B
BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS
Features
Applications
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
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
Integrated LDO regulator allows
direct connection to battery
2.5 x 2.5 mm 16-pin QFN
package
Pb-free/RoHS compliant
RDS/RBDS Processor (Si4709)
Cellular handsets
MP3 players
Portable radios
Portable navigation
Consumer electronics
USB FM radio
PDAs
Notebook PCs
VIO
CONTROLLER
I
ADC
Q
ADC
Si4708/09
DSP
SCLK
SDIO
CONTROL
INTERFACE
SEN
DAC
DAC
ROUT
LOUT
0 / 90 LOW-IF
RSSI
TUNE
GPIO
AMPLIFIER
GPO
RST
RFGND
LNA
FMI
AFC
AGC
PGA
RCLK
REG
VA
VD
32.768 kHz
Headphone
Cable
RDS
(Si4709)
Patents pending
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.
Ordering Information:
See page 34.
Pin Assignments
(Top View)
Si4708/09-GM
GND
PAD
1
NC
RCLK
ROUT
RST
LOUT
SEN
SDIO
SCLK
GND
FMI
RFGND
V
A
V
D
NC
GPO
V
IO
2
4
3
5
12
10
11
6 87
9
141516 13
Si4708/09-B
2 Confidential Rev. 1.4
Si4708/09-B
Confidential Rev. 1.4 3
TABLE OF CONTENTS
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
4.3. General Purpose Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.4. RDS/RBDS Processor and Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.5. Stereo Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4.6. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.7. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.8. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.9. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.10. Audio Output Summation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
4.11. Initialization Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

SI4709-B-GM

Mfr. #:
Manufacturer:
Silicon Labs
Description:
RF RCVR FM 76MHZ-108MHZ 16QFN
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

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