SI4707-B20 Datasheet, PDF (1/30 Pages) Silicon Laboratories – WEATHER BAND AND SAME DATA RECEIVER

Si4707-B20
WEATHER BAND AND SAME DATA RECEIVER
Features
 Weather band support
 WB digital tuning
(162.4–162.55 MHz)
 Low-IF direct conversion with no
 SAME processor
external ceramic filters
Excellent SAME sensitivity
 Programmable reference clock
Byte-wise data quality metrics ^{ Volume control}
Advanced error correction
 Receive signal quality indicators
 1050 Hz alert tone detection
(RSSI and SNR)
 Excellent real-world performance
 2-wire and 3-wire control interface
 Freq synthesizer with integrated VCO ^{ Integrated LDO regulator}
 Automatic frequency control (AFC) ^{ 2.7 to 5.5 V supply voltage}
 Automatic gain control (AGC)
 Firmware upgradeable
 Adaptive noise suppression
 3 x 3 x 0.55 mm 20-pin QFN package
 Pb-free/RoHS compliant
Applications
 Emergency radios
 Table and portable radios
 Stereos
 Mini/micro systems
 Portable media players
 Boom boxes
 Cellular handsets
 Modules
 Clock radios
 Mini HiFi
Description
The Si4707 is the first digital CMOS weather band and SAME decoder receiver IC
to integrate the complete tuner and decoder functionality from antenna input to
audio and/or data output.
Functional Block Diagram
Ordering Information:
See page 22.
Pin Assignments
Si4707-B20-GM
(Top View)
NC 1 ^{20 19 18 17} 16
FMI 2
15 NP2
RFGND 3
NP1 4
GND
PAD
14 LOUT
13 ROUT
RST 5
12 GND
6 _{7 8 9 10} 11 VDD
Weather Band
Antenna
FMI
RFGND
32.768 kHz
RCLK
2.7–5.5 V VDD
LNA
AGC
0/90
AFC
REG
XTAL
OSC
ADC
PGA
DSP
ADC
RSSI /
SNR
SAME
CONTROL
INTERFACE
Si4707
DAC
LOUT
DAC
ROUT
GPO
GPO
Patents pending
Notes:
1. To ensure proper operation and
receiver performance, follow the
guidelines in “AN383: Si47xx
Antenna, Schematic, Layout, and
Design Guidelines.” Silicon
Laboratories will evaluate
schematics and layouts for qualified
customers.
2. Place Si4707 as close as possible to
antenna jack and keep the FMI
traces as short as possible.
Rev. 0.8 6/08
Copyright © 2008 by Silicon Laboratories
Si4707-B20
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.