Si4736/37/38/39-B20
B
ROADCAST
W
EATHER BAND
R
ADIO
R
ECEIVER
Features
NOAA weather band support (162.4–
No manual alignment necessary
NC
1
20
19
18
17
16
15 DOUT
14 LOUT
13 ROUT
12 GND
11 VDD
FMI 2
RFGND 3
AMI 4
Description
GND
PAD
RST 5
Functional Block Diagram
Si473x
DIGITAL
AUDIO
(Si4737/
39)
AMI
Patents pending
AM
ANT
RFGND
LNA
RDS
(Si4737/
39)
LOW-IF
DOUT
DFS
AGC
GPO/DCLK
FM/
WB
ANT
ADC
DAC
ROUT
FMI
LNA
AGC
ADC
DSP
DAC
LOUT
2.7– 5.5 V
VDD
GND
LDO
AFC
CONTROL
INTERFACE
VIO
1.5–3.6 V
Notes:
1.
To ensure proper operation and
receiver performance, follow the
guidelines in “AN383: Universal
Antenna Selection and Layout
Guidelines.” Silicon Laboratories will
evaluate schematics and layouts for
qualified customers.
2.
Place Si4736/37/38/39 as close as
possible to antenna jack and keep
the FMI and AMI traces as short as
possible.
SCLK
SDIO
SEN
Rev. 1.0 4/08
Copyright © 2008 by Silicon Laboratories
RCLK
RST
Si4736/37/38/39-B20
RCLK
SCLK
SEN
SDIO
VIO
The Si4736/37/38/39 is the first digital CMOS AM/FM/WB radio receiver IC that
integrates the complete tuner function from antenna input to audio output.
6
7
8
9
10
DFS
NC
Emergency radios
Table and portable radios
Stereos
Mini/micro systems
Portable media players
Boom boxes
Cellular handsets
Modules
Clock radios
Mini HiFi
GPO2/INT
Applications
N
ot
Pl Re
ea c
se om
us me
e nd
Si e
47 d
36 for
/3 N
7/ ew
38 D
/3 e
9- sig
C n
40 s
Programmable soft mute control
Programmable de-emphasis
RDS/RBDS processor (Si4737/39
162.55 MHz)
Worldwide FM band support
(76–108 MHz)
Worldwide AM band support
(520–1710 kHz) (Si4736/37 only)
1050 Hz alert tone detection
Excellent real-world performance
Freq synthesizer with integrated VCO
Advanced AM/FM seek tuning
Automatic frequency control (AFC)
Automatic gain control (AGC)
Integrated LDO regulator
Digital FM stereo decoder
Adaptive noise suppression
AM/FM/WB digital tuning
Programmable reference clock
Volume control
only)
Optional digital audio output (Si47/39
only)
Optional digital audio output
(Si4737/39 only)
2-wire and 3-wire control interface
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 30.
Pin Assignments
Si4736/37/38/39-GM
(Top View)
GPO3/DCLK
GPO1
Si4736/37/38/39-B20
2
Rev. 1.0
Si4736/37/38/39-B20
T
ABLE O F
C
ONTENTS
Section
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.2. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3. FM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.4. AM Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.5. SW Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.6. LW Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.7. Digital Audio Interface (Si4735 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.8. Stereo Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.9. De-emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.10. Stereo DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.11. Soft Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
4.12. RDS/RBDS Processor (Si4735 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
4.13. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.14. Seek . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.15. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.16. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.17. GPO Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.18. Firmware Upgrades . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
4.19. Reset, Power Up, and Power Down . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.20. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
6. Pin Descriptions: Si4734/35-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8. Package Markings (Top Marks) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.1. Si4734/35 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
8.2. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
9. Package Outline: Si4734/35 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
10. PCB Land Pattern: Si4734/35 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38
Rev. 1.0
3
Si4736/37/38/39-B20
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
Supply Voltage
Interface Supply Voltage
Power Supply Power-Up Rise Time
Interface Power Supply Power-Up 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 Si4736/37/38/39 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, DCLK, DFS, GPO1, GPO2, and GPO3.
4.
At RF input pins, FMI and AMI.
4
Rev. 1.0
Si4736/37/38/39-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
FM Mode
Supply Current
Supply Current
1
RDS Supply Current
2
Supply Current
2
WB Mode
Supply Current
Supply Current
Supply Current
AM Mode
Supply Current
Supply Current
2
Supplies and Interface
Interface Supply Current
V
DD
Powerdown Current
V
IO
Powerdown Current
High Level Input Voltage
3
Low Level Input Voltage
3
High Level Input Current
3
Low Level Input Current
3
High Level Output Voltage
4
Low Level Output Voltage
4
Symbol
Test Condition
Min
Typ
Max
Unit
I
FM
I
FM
I
FM
I
FMD
I
FM
I
FM
I
FMD
Low SNR level
Digital Output Mode
Low SNR level
—
—
—
—
19.2
19.8
19.9
18.0
22
23
23
20.5
mA
mA
mA
mA
—
—
—
19.2
19.8
17.2
22
23
20.5
mA
mA
mA
I
AM
I
AMD
I
IO
I
DDPD
I
IOPD
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
Analog Output Mode
Digital Output Mode
—
—
17.3
15.5
20.5
20.5
mA
mA
—
—
SCLK, RCLK inactive
—
0.7 x V
IO
–0.3
V
IN
= V
IO
= 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 V
IO
—
320
10
1
—
—
—
—
—
—
600
20
10
V
IO
+ 0.3
0.3 x V
IO
10
10
—
0.2 x V
IO
µA
µA
µA
V
V
µA
µA
V
V
Notes:
1.
LNA is automatically switched to higher current mode for optimum sensitivity in weak signal conditions.
2.
Specifications are guaranteed by characterization.
3.
For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, and DFS.
4.
For output pins SDIO, DOUT, GPO1, GPO2, and GPO3.
Rev. 1.0
5
