Si 4 7 0 7 - B2 0
W
EATHER
B
A N D A N D
SAME D
A TA
R
ECEIVER
Features
Weather band support
WB digital tuning
Low-IF direct conversion with no
(162.4–162.55 MHz)
SAME processor
SAME sensitivity
Byte-wise data quality metrics
Advanced error correction
1050 Hz alert tone detection
Excellent real-world performance
Freq synthesizer with integrated VCO
Automatic frequency control (AFC)
Automatic gain control (AGC)
Adaptive noise suppression
Excellent
external ceramic filters
Programmable reference clock
Volume control
Receive signal quality indicators
(RSSI and SNR)
2-wire and 3-wire control interface
Integrated LDO regulator
2.7 to 5.5 V supply voltage
Firmware upgradeable
3 x 3 x 0.55 mm 20-pin QFN package
Pb-free/RoHS compliant
Ordering Information:
See page 22.
Pin Assignments
Si4707-B20-GM
Applications
Emergency radios
Table and portable radios
Stereos
Mini/micro systems
Portable media players
Boom boxes
Cellular handsets
Modules
Clock radios
Mini HiFi
(Top View)
GPO2/INT
GPO1
GPO3
17
10
VIO
NC
1
20
19
18
16
15 NP2
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.
FMI 2
RFGND 3
NP1 4
RST 5
6
SEN
7
SCLK
8
SDIO
9
RCLK
GND
PAD
Functional Block Diagram
Weather Band
Antenna
FMI
RFGND
LNA
PGA
ADC
AGC
0/90
32.768 kHz
RCLK
2.7–5.5 V
AFC
RSSI /
SNR
SAME
GPO
GPO
ADC
DSP
DAC
ROUT
11 VDD
Si4707
DAC
LOUT
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.
VDD
REG
XTAL
OSC
SEN
CONTROL
INTERFACE
SCLK
SDIO
RST
Rev. 0.8 6/08
Copyright © 2008 by Silicon Laboratories
VIO
Si4707-B20
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
NP3
14 LOUT
13 ROUT
12 GND
NC
Si4707-B20
T
ABLE O F
C
ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.2. Block Diagram Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3. Weather Band Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4. DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.5. SAME Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.8. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
4.9. GPO Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.10. Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.11. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.12. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6. Pin Descriptions: Si4707-B20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8. Package Markings (Top Marks) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.1. Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
8.2. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9. Package Outline: Si4707 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
10. PCB Land Pattern: Si4707 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Rev. 0.8
3
Si4707-B20
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
Supply Voltage
Interface Supply Voltage
Power Supply Powerup Rise Time
Interface Power Supply Powerup Rise Time
Ambient Temperature
Symbol
V
DD
V
IO
V
DDRISE
V
IORISE
T
A
Test Condition
Min
2.7
1.5
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 VDD = 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
Supply Voltage
Interface Supply Voltage
Input Current
3
Input Voltage
3
Operating Temperature
Storage Temperature
RF Input Level
4
Symbol
V
DD
V
IO
I
IN
V
IN
T
OP
T
STG
Value
–0.5 to 5.8
–0.5 to 3.9
10
–0.3 to (VIO + 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 Si4707 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 SCLK, SEN, SDIO, RST, RCLK, GPO1, GPO2, and GPO3.
4.
At RF input pins, FMI.
4
Rev. 0.8
Si4707-B20
Table 3. DC Characteristics
(V
DD
= 2.7 to 5.5 V, V
IO
= 1.5 to 3.6 V, T
A
= –20 to 85
C)
Parameter
Supply Current
Interface Supply Current
V
DD
Powerdown Current
1
V
IO
Powerdown Current
1
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
I
FM
I
IO
I
DDPD
I
IOPD
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
Test Condition
Min
—
—
—
Typ
19.1
320
10
1
—
—
—
—
—
—
Max
23
600
20
10
—
0.3 x VIO
10
10
—
0.2 x VIO
Unit
mA
µA
µA
µA
V
V
µA
µA
V
V
SCLK, RCLK inactive
—
0.7 x VIO
—
V
IN
= VIO = 3.6 V
V
IN
= 0 V,
V
IO
= 3.6 V
I
OUT
= 500 µA
I
OUT
= –500 µA
–10
–10
0.8 x VIO
—
Notes:
1.
Specifications are guaranteed by characterization.
2.
For input pins SCLK, SEN, SDIO, RST, and RCLK.
3.
For output pins SDIO, GPO1, GPO2, and GPO3.
Rev. 0.8
5
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