SI4708-C Datasheet, PDF (1/40 Pages) Silicon Laboratories – BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS

Si4708/09-C
BROADCAST FM RADIO TUNER FOR PORTABLE APPLICATIONS
Features
 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)
Applications
 Cellular handsets
 MP3 players
 Portable radios
Description
 Portable navigation  USB FM radio
 Consumer electronics  PDAs
 Mobile Internet
devices
 Notebook PCs
 Net PCs
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
Si4708/09
I
ADC
DAC
LOUT
PGA
DSP
Q
ADC
DAC
ROUT
AGC
0 / 90
32.768 kHz
RCLK _TUNE
AFC
VA
VD ^REG
LOW-IF GPIO
RDS
(Si4709)
RSSI
GPO
VIO
RST
SDIO
SCLK
SEN
Ordering Information:
See page 34.
Pin Assignments
(Top View)
Si4708/09-GM
1 16
15
14 13 LOUT
FMI 2
12 ROUT
RFGND 3
GND
PAD
11 GND
RST ⁴
10 VD
SEN 5 6
7
89
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.
Rev. 1.2 10/10
Copyright © 2010 by Silicon Laboratories
Si4708/09-C