Si4736-37-38-39 Data Short

Si4736/7/8/9
Broadcast AM/FM/WB Radio Receiver
Description
The Si4736/37 and Si4738/39 are the industry's first
fully integrated, 100% CMOS AM/FM/WB and FM/
WB radio receiver ICs. Offering unmatched
integration and PCB space savings, the Si4736/37/
38/39 requires only two external components and
less than 15 mm2 of board area, excluding the
antenna inputs. The Si4736/37/38/39 AM/FM/WB
radio provides the space savings and low power
consumption necessary for portable devices while
delivering the high performance and design simplicity
desired for all AM/FM/WB solutions.
Leveraging Silicon Laboratories' proven and
patented Si4700/01 FM tuner's digital low
intermediate frequency (low-IF) receiver architecture,
the
Si4736/37/38/39
delivers
superior
RF
performance and interference rejection in both AM
and FM bands. The high integration and complete
system production test simplifies design-in,
increases
system
quality,
and
improves
manufacturability.
The Si4736/37/38/39 is a feature-rich solution
including 1050 Hz tone detection, advanced seek
algorithms, soft mute, auto-calibrated digital tuning,
and FM stereo processing. In addition, the Si4736/
37/38/39 provides analog and digital audio outputs
and a programmable reference clock. The device
supports I2C-compatible, 2-wire control interface,
SPI, and a Si4700/01 backwards-compatible, 3-wire
control interface.
The Si4736/37/38/39 utilizes digital processing to
achieve high fidelity, optimal performance, and
design flexibility. The chip provides excellent pilot
rejection, selectivity, and unmatched audio
performance, and offers both the manufacturer and
the end-user extensive programmability and flexibility
in listening experience.
The Si4737/39 incorporates a digital processor for
the European Radio Data System (RDS) and the
North American Radio Broadcast Data System
(RBDS), and includes all required symbol decoding,
block synchronization, error detection, and error
correction functions. Using this feature, the Si4737/
39 enables broadcast data such as station
identification and song name to be displayed to the
user.
Features
- Weather band support (162.4–162.55 MHz)
- Worldwide FM band support (76–108 MHz)
- Worldwide AM band support (520–1710 kHz) 
-
(Si4736/7)
1050 Hz tone detection
AM/FM/WB digital tuning
No manual alignment necessary
Excellent real-world performance
Dynamic channel filters
Advanced AM/FM seek tuning
Digital volume control
Adjustable soft mute control
Frequency synthesizer with integrated VCO
Automatic frequency control (AFC)
Automatic gain control (AGC)
Programmable de-emphasis
Integrated LDO regulator
Programmable reference clock
FM RDS/RBDS processor (Si4736/7)
2-wire and 3-wire control interface
2.7 to 5.5 V supply voltage
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
Handsets
Boom boxes
Clock radios
Si473x
AMI
LNA
AGC
LOW-IF
ADC
2.7– 5.5 V
ADC
VDD
LDO
AFC
RCLK
GND
AM/FM/WB Receiver
DFS
GPO/DCLK
DAC
ROUT
DAC
LOUT
CONTROL
INTERFACE
SEN
AGC
DOUT
DSP
SCLK
FMI
LNA
DIGITAL
AUDIO
(Si4737/
39)
VIO
1.5–3.6 V
RST
FM/
WB
ANT
RFGND
SDIO
AM
ANT
RDS
(Si4737/
39)
Copyright © 2008 by Silicon Laboratories
01.7.08
Si4736/7/8/9
Broadcast AM/FM/WB Radio Receiver
Selected FM Electrical Specifications
Parameter
Symbol
Test Condition
Input Frequency
fRF
Sensitivity headphone matching
(S+N)/N = 26 dB
Sensitivity 50  matching
(S+N)/N = 26 dB
Input IP3
|f2 – f1| > 1 MHz; f0 = 2 x f1 – f2
Adjacent Channel Selectivity
±200 kHz
Alternate Channel Selectivity
±400 kHz
Audio Mono S/N
Audio THD
Audio Output Voltage
Supply Voltage*
VD, VA
Interface Supply Voltage*
VIO
Powerdown Current*
IPD
*Note: Applies to AM, FM, and WB modes.
Min
76
—
—
—
—
—
—
—
72
2.7
1.5
—
Typ
—
2.2
1.1
105
50
70
63
0.1
80
—
—
10
Max
108
—
—
—
—
—
—
—
90
5.5
3.6
—
Unit
MHz
µV EMF
µV EMF
dBµV EMF
dB
dB
dB
%
mVrms
V
V
µA
WB Receiver Characteristics
Parameter
Input Frequency
Sensitivity
Adjacent Channel Selectivity
Audio S/N
Symbol
fR
Test Condition
SINAD = 12 dB
+/-25 kHz
Mono
Min
162.4
—
—
—
Typ
—
1.2
55
45
Max
162.55
—
—
—
Unit
MHz
µV EMF
dB
dB
Selected AM Electrical Specifications
Parameter
Input Frequency
Sensitivity
Audio S/N
Audio THD
Audio Output Voltage
Pin Assignments
Symbol
fRF
Test Condition
Medium wave (AM)
(S+N)/N = 26 dB
Min
520
—
—
—
54
Typ
—
25
56
0.1
60
Max
1710
—
—
—
66
3 x 3 x 0.55 mm, 20-pin QFN Package Information
GPO1
GPO2/INT
GPO3/DCLK
DFS
1
NC
Symbol
NC
20
19
18
17
16
FMI 2
A
A1
b
c
D
D2
e
E
E2
f
L
L1
aaa
bbb
ccc
ddd
eee
15 DOUT
FGND 3
14 LOUT
GND
PAD
AMI 4
13 ROUT
6
7
8
9
10
SEN
SDIO
RCLK
VIO
12 GND
SCLK
RST 5
AM/FM/WB Receiver
Unit
kHz
µV EMF
dB
%
mVrms
11 VDD
Millimeters
Min
Nom
Max
0.50
0.55
0.60
0.00
0.02
0.05
0.18
0.25
0.30
0.27
0.32
0.37
3.00 BSC
1.60
1.70
1.80
0.50 BSC
3.00 BSC
1.60
1.70
1.80
2.53 BSC
0.35
0.40
0.45
0.00
—
0.10
—
—
0.10
—
—
0.10
—
—
0.08
—
—
0.10
—
—
0.10
Copyright © 2008 by Silicon Laboratories
Silicon Laboratories and Silicon Labs are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders
01.7.08
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