SI4742 [SILICON]
Automotive AM/FM Radio Receiver; 汽车AM / FM收音机接收器
| 型号： | SI4742 |
| 厂家： | 
SILICON |
| 描述： | Automotive AM/FM Radio Receiver |
| 文件： | 总2页 (文件大小：66K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Si4740/41/42/43/44/45
Automotive AM/FM Radio Receiver
Description
Features
The Si474x receiver family applies 100% RF CMOS
technology to bring digital low-IF radio technology to the
automotive receiver market. The Si474x receiver family
builds on Silicon Laboratories’ highly successful broadcast
audio radio products, offering design simplicity, unmatched
integration, programmability, and automotive quality and
reliability.
The Si474x receiver family supports world-wide FM bands
from 64–108 MHz and AM bands from 520–1710 kHz. The
Si474x supports AM/FM, weather band, shortwave, and
longwave radio bands. All odd-numbered part numbers in
the family support international RDS/RBDS protocols.
The Si474x family leverages Silicon Laboratories’ patented
digital architecture, delivering superior RF performance
and interference rejection. The proven digital radio
technology provides excellent sensitivity in weak signal
environments, and superb selectivity and inter-modulation
immunity in strong signal environments.
- Worldwide FM band support (64–108 MHz)
- Worldwide AM band support (520–1710 kHz)
- Shortwave, longwave support (Si4742/43/44/45 only)
- Weather band support (Si4742/43 only)
- Received signal quality indicators (RSSI, SNR, adjacent
channel, wideband AM)
- Multipath detection/mitigation
- AM and FM noise blankers (Si4742/43/44/45 only)
- AM and FM programmable seek tuning
- AM and FM programmable soft mute control
- AM and FM adjustable channel bandwidth filters
- FM stereo-mono blending
- FM Hi-Cut control (Si4742/43/44/45 only)
- Digital FM stereo decoder
- RDS/RBDS processor (Si4741/43/45 only)
- Automatic frequency control (AFC)
The solution offers programmable AM/FM channel spacing
and filters, auto-calibrated digital tuning, and proven
AM/FM seek functionality based on multiple signal quality
and band parameters. The family offers highly flexible and
advanced audio features such as noise blanking,
programmable soft mute, and multi-path detection and
mitigation.
The Si474x receiver system has a minimal bill of materials
requiring a small amount of board space. The high level of
integration provides a complete, tested broadcast audio
receiver that is ideal for primary automotive radio receivers.
- Automatic gain control (AGC)
- Image rejection mixer
- Frequency synthesizer with integrated VCO
- Low-IF direct conversion with no ceramic filters
- Analog or digital (I2S) outputs
- 3.0 to 3.6 V supply voltage
- Programmable reference clock
- AECQ-100 certified
• –40 to 85 ºC operation
-
24-pin 4 x 4 mm QFN package
• Pb-free/RoHS compliant
Applications
- OEM automotive radio systems
- After-market automotive radio systems
- Automotive radio modules
Si474x
RDS
DOUT
DFS
FMI
DIGITAL
AUDIO
LNA
WEAK
SIGNAL
CONDITION
DCLK
AGC
ADC
ADC
DAC
DAC
ROUT
LOUT
AMI
LNA
DSP
GND
AGC
AGC
GPO1-3
VIO
QUALITY
DETECTOR
3.0–3.6 V
VDD
GND
CNTRL
LDO
AFC
RST
AM/FM Receiver
Copyright © 2008 by Silicon Laboratories
10.23.08
Si4740/41/42/43/44/45
Automotive AM/FM Radio Receiver
Selected Electrical Specifications1
(VDD = 2.7 to 5.5 V, VIO = 1.5 to 3.6 V, TA = –40 to 85 °C)
Parameter
Test Condition
Min
Typ
Max
Unit
FM
Input Frequency
Sensitivity
64
—
—
—
2
108
—
MHz
(S+N)/N = 26 dB
µV EMF
µV EMF
RDS Sensitivity
f = 2 kHz, RDS BLER < 5%
fMOD = 1 kHz, f = 22.5 kHz,
EMF = 60 dBµVEMF
fMOD = 1 kHz, f = 75 kHz,
EMF = 60 dBµVEMF
8
—
Audio S/N (Mono)2,3
—
—
63
—
—
dB
%
V
Audio THD (Mono)2,3
0.1
V
Input IP3
f1 = 4000 kHz; f2 = 8000 kHz
—
—
—
—
105
80
—
—
—
—
dBµV EMF
mVrms
dB
Audio Output Voltage
Adjacent Channel Selectivity
Alternate Channel Selectivity
±200 kHz
±400 kHz
50
70
dB
m = 0.3; f = 22.5 kHz; fRF = 76 to 108 MHz;
Measured at VEMF = 60 dBµVEMF
AM Suppression4
—
—
55
45
—
—
dB
dB
fRF = 76 to 108 MHz; Measured at VEMF
=
Audio Stereo Separation4
60 dBµVEMF; f = 75 kHz
Supply Voltage5
Supply Current5
AM
3
—
3.6
—
V
—
26
mA
Input Frequency
Sensitivity
520
—
—
1710
—
kHz
(S+N)/N = 26 dB
28
µV EMF
30% modulation, fMOD =1 kHz,
RF level = 74 dBµV EMF; f = 22.5 kHz
30% modulation, fMOD =1 kHz,
Audio S/N4,6
—
—
53
—
—
dB
%
Audio THD4,6
0.3
RF level = 74 dBµV EMF; f = 22.5 kHz
Input IP37
f1 = 40 kHz; f2 = 80 kHz
—
54
—
—
112
60
—
66
—
—
dBµV
mVrms
dB
Audio Output Voltage4
Adjacent Channel Selectivity
Alternate Channel Selectivity
Notes:
±10 kHz
±20 kHz
40
60
dB
1. Specifications refer to Si474x application circuit input.
2. BAF = 300 Hz to 15 kHz.
3. fRF = 76 to 108 MHz.
4. FMOD = 1 kHz, 75 µs de-emphasis, MONO = enabled, and L = R unless noted otherwise.
5. Applies to both FM and AM modes.
6. AGC is disabled.
7. Specification refers to Si474x input.
Pin Assignments
4 x 4 x 0.85 mm 24-pin QFN Package Information
Symbol
Millimeters
Min
0.80
0.00
0.18
Nom
0.85
0.02
0.25
4.00 BSC
2.10
0.50 BSC
4.00 BSC
2.10
0.40
—
Max
0.90
0.05
0.30
A
A1
b
D
D2
e
E
E2
L
aaa
bbb
ccc
ddd
eee
24 23 22 21 20 19
FMI
RFGND
AGC1
NC
1
2
3
4
5
6
18 DFS
17 DOUT
16 LOUT
15 ROUT
14 GND
13 VDD
2.00
2.20
GND
PAD
GND
2.00
0.30
—
—
—
2.20
0.50
0.10
0.10
0.08
0.10
0.10
AMI
7
8
9
10 11 12
—
—
—
—
—
—
AM/FM Receiver
Copyright © 2008 by Silicon Laboratories
10.23.08
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.
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