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Silicon Laboratories
Silicon Laboratories

SI4731 Datasheet Preview

SI4731 Datasheet

(SI4730 / SI4731) Broadcast AM/FM Radio Receiver

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SI4731 pdf
Si4730/31
Broadcast AM/FM Radio Receiver
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The Si4730/31 is the industry's first fully integrated, 100%
CMOS AM/FM radio receiver IC. The Si4730/31 AM/FM
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 solutions. Offering unmatched
integration and PCB space savings, the Si4730/31
requires only two external components and less than 15
mm2 of board area.
Leveraging Silicon Laboratories' proven and patented
Si4700/01 FM digital receiver architecture, the Si4730/31
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 Si4730/31 solution includes advanced seek
algorithms, adjustable soft mute, auto-calibrated digital
tuning, and FM stereo processing. In addition, the Si4730/
31 provides a programmable reference clock, I2C-
compatible 2-wire control interface, and a Si4700/01
backwards-compatible 3-wire control interface.
The Si4730/31 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 Si4731 incorporates a digital processor for the
European Radio Data System (RDS) and the North
American Radio Broadcast Data System (RBDS)
including all required symbol decoding, block
synchronization, error detection, and error correction
functions. Using this feature, the Si4731 enables
broadcast data such as station identification and song
name to be displayed to the end user.
Features
- Worldwide FM band support (76–108 MHz)
- Worldwide AM band support (520–1710 kHz)
- AM/FM digital tuning
- Excellent real-world performance
- Only 2 external components
- No manual alignment required
- Adjustable AM 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 AM/FM de-emphasis
- Adaptive noise suppression
- Integrated LDO regulator
- Programmable reference clock
- FM RDS/RBDS processor (Si4731 only)
- 2-wire and 3-wire control interface
- 2.7 to 5.5 V supply voltage
- AM ferrite loopstick and air loop antenna support
- 3 x 3 x 0.55 mm 20-pin QFN package
- Pb-free/RoHS compliant
Applications
- Table and portable radios
- Stereos
- Mini/micro systems
- Portable media players
- Boomboxes
- Cellular handsets
- Clock radios
- Modules
- Entertainment systems
AMI
AM
ANT RFGND
LNA
AGC
Si473x
RDS
(Si4731)
LOW-IF
FM
ANT
FMI
2.7–5.5 V
VDD
GND
LNA
AGC
LDO
ADC DAC
DSP
ADC DAC
ROUT
LOUT
AFC
CONTROL
INTERFACE
VIO
1.5–3.6 V
AM/FM Receiver
Copyright © 2007 by Silicon Laboratories
6.15.07



Silicon Laboratories
Silicon Laboratories

SI4731 Datasheet Preview

SI4731 Datasheet

(SI4730 / SI4731) Broadcast AM/FM Radio Receiver

No Preview Available !

SI4731 pdf
Si4730/31
Broadcast AM/FM Radio Receiver
wwSwe.lDeactatSehdeeFt4MU.cEomlectrical Specifications
Parameter
Symbol
Test Condition
Min Typ Max
Unit
Input Frequency
Sensitivity headphone matching
fRF
(S+N)/N = 26 dB
76 — 108 MHz
— 2.2 — µV EMF
Sensitivity 50 matching
(S+N)/N = 26 dB
— 1.1 — µV EMF
Input IP3
Adjacent Channel Selectivity
|f2 – f1| > 1 MHz; f0 = 2 x f1 – f2
105
— dBµV EMF
±200 kHz
— 50 —
dB
Alternate Channel Selectivity
±400 kHz
— 70 —
dB
Audio Band Limits
±1.5 dB
30 — 15k Hz
Audio S/N
— 63 —
dB
Audio THD
— 0.1 —
%
Audio Output Voltage
72 80 90 mVrms
Supply Voltage*
VD, VA
Interface Supply Voltage*
VIO
Powerdown Current*
IPD
*Note: Applies to both FM and AM modes.
2.7 — 5.5
1.5 — 3.6
— 10 —
V
V
µA
Selected AM Electrical Specifications
Parameter
Input Frequency
Sensitivity
Audio S/N
Audio THD
Audio Output Voltage
Antenna Inductance
Symbol
fRF
Test Condition
(S+N)/N = 26 dB
Min Typ Max
Unit
520 — 1710 kHz
— 38 — µV EMF
— 58 —
dB
— 0.1 —
%
54 60 66 mVrms
180 — 600
µH
Pin Assignments
3 x 3 x 0.55 mm, 20-pin QFN Package Information
NC 1 20 19 18 17 16
FMI 2
15 NC
RFGND 3
AMI 4
GND
PAD
14 LOUT
13 ROUT
RST 5
12 GND
6 7 8 9 10 11 VDD
Symbol
A
A1
b
c
D
D2
e
E
E2
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
Symbol
f
L
L1
aaa
bbb
ccc
ddd
eee
Millimeters
Min Nom Max
0.35
0.00
2.53 BSC
0.40
0.45
0.10
0.10
0.10
0.08
0.10
0.10
AM/FM Receiver
Copyright © 2007 by Silicon Laboratories
6.15.07
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.


Part Number SI4731
Description (SI4730 / SI4731) Broadcast AM/FM Radio Receiver
Maker Silicon Laboratories
Total Page 2 Pages
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