SI4721 [SILICON]
Broadcast FM Radio Transceiver for Portable Applications; 广播FM无线电收发器用于便携式应用
| 型号： | SI4721 |
| 厂家： | 
SILICON |
| 描述： | Broadcast FM Radio Transceiver for Portable Applications |
| 文件： | 总2页 (文件大小：201K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Si4720/21
Broadcast FM Radio Transceiver for Portable Applications
Description
Features
The Si4720/21 is the first single chip FM radio transceiver.
The proven and patented digital architecture of the Si4720/
21 combines the functionality of the Si470x FM radio
receiver with the Si471x FM transmitter, offering full FM
receive and transmit capabilities in a single, ultra-small
3x3x0.55 mm QFN package. The device leverages Silicon
Lab's highly successful and proven FM technology, and
offers unmatched integration and performance allowing FM
receive and transmit to be added to any portable device by
using a single chip. As with the Si470x and Si471x
products, the Si4720/21 offers industry leading size,
performance, low power consumption, and ease of use.
The Si4720/21's digital integration reduces the required
external components of traditional offerings, resulting in a
solution requiring only an external inductor and bypass
capacitor, and a PCB space of approximately 15 mm2. The
Si4720/21 is layout compatible with Silicon Laboratories'
Si470x FM radio receivers, Si473x AM/FM radio receivers,
and the Si471x FM radio transmitter solutions, allowing a
single PCB layout to accommodate a variety of music
features. High yield manufacturability, unmatched
- Integrated FM antenna support
- Excellent real-world performance
- Only two external components required
- Worldwide FM band support (76 to 108 MHz)
- RDS/RBDS processor (Si4721)
- Frequency synthesizer with integrated VCO
- Adjustable seek parameters
- Adjustable mono/stereo blend
- Adjustable soft mute
- Programmable transmit output voltage control
- Audio dynamic range control
- Advanced modulation control
- Analog/digital audio interface
- Programmable reference clock input
- Programmable pre/de-emphasis (50/75 µs)
- 2-wire and 3-wire control interface
- Integrated LDO regulator
- 2.7 to 5.5 V supply voltage
- 3x3x0.55 mm 20-pin Pb-free QFN package
performance,
easy
design-in,
and
software
programmability are key advantages of the Si4720/21.
The Si4721 is the industry's first single-chip integrated FM
radio transceiver including both receive and transmit
support for the European Radio Data System (RDS) and
the U.S. Radio Broadcast Data System (RBDS). RDS
allows digital information sent from the broadcaster to be
displayed, such as station ID, song name and music
category. In Europe, alternate frequency (AF) information is
also provided to automatically change stations in areas
where broadcasters use multiple frequencies. In transmit
mode, digital information such as artist name, song title,
music category, and branded messaging can be
transmitted and displayed on any RDS/RBDS receiver.
Applications
- Cellular handsets/hands free
- MP3 players
- Portable media players
- GPS/navigation devices
- Satellite digital audio radios
- Personal computers
Users are responsible to adjust their system's radiated
power levels to comply with local regulations on RF
transmission (FCC, ETSI, ARIB, etc.).
Si472x
TX
LIN
/DFS
Ant
TXO
L1
120 uH
RIN
/DIO
RX
Ant
ROUT
/DIO
ADC
ADC
DAC
DAC
FMI
LNA
AGC
PGA
AFC
DSP
RFGND
VDD
LOUT
/DFS
2.7–5.5 V
RDS
(Si4721)
CONTROL
INTERFACE
LDO
GPO
C1 GND
22 uF
FM Transceiver
Copyright © 2007 by Silicon Laboratories
1.18.07
Si4720/21
Broadcast FM Radio Transceiver for Portable Applications
Selected Electrical Specifications
Parameter
Frequency Range
Symbol
Test Condition
Min
76
—
Typ
—
Max
108
—
Unit
MHz
f
RF
Sensitivity
Input IP3
(S+N)/N = 26 dB
2.2
108
µV EMF
dBµV EMF
|f – f | > 1 MHz; f = 2 x f – f
—
—
2
1
0
1
2
AGC disabled
Adjacent Channel Selectivity
Alternate Channel Selectivity
RX Audio Output Voltage
RX Audio Band Limits
RX Audio S/N
±200 kHz
±400 kHz
—
—
72
30
—
—
—
50
70
—
—
dB
dB
80
90
15k
—
mVrms
Hz
±1.5 dB
—
63
dB
RX Audio THD
0.1
115
—
%
Programmable Transmit Output
Voltage, TXO (Maximum Voltage)
—
dBµV
Programmable Transmit Output
Voltage, TXO (Minimum Voltage)
—
83
—
dBµV
Transmit Voltage Stability
–1
—
—
—
70
45
—
—
30
—
—
—
1
1
2
dB
dB
dBC
dBC
us
Transmit Voltage Step
Transmit Channel Edge Power
Transmit Adjacent Channel Power
Pre/de-emphasis Time Constant
—
–20
–26
80
–30
75
50
63
0.1
35
–50
—
FMPE[1:0] = 00
FMPE[1:0] = 01
54
us
TX Audio SNR
—
dB
%
TX Audio THD
—
TX Audio Stereo Separation
TX Sub Carrier Rejection Ratio
TX Audio Input Signal Level (0 dB)
—
dB
dB
SCR
–40
0.636
V
V
= 1.8 V
V
pk
AI
IO
Pin Assignments
Package Information
20 19 18 17
NC
FMI
1
16
2
15 RIN/DIO
14 LOUT/DFS
13 ROUTDIO
12 GND
RFGND
TXO
3
4
5
GND
PAD
RST
6
11 VDD
10
7
8
9
Symbol
Millimeters
Symbol
Millimeters
Min
Nom
0.55
0.02
0.25
0.32
Max
0.60
0.05
0.30
0.37
Min
Nom
Max
A
A1
b
0.50
0.00
0.18
0.27
f
2.53 BSC
L
0.35
0.00
—
0.40
—
0.45
0.10
0.10
0.10
0.08
0.10
0.10
L1
c
aaa
bbb
ccc
ddd
eee
—
D
3.00 BSC
1.70
—
—
D2
e
1.60
1.60
1.80
1.80
—
—
0.50 BSC
3.00 BSC
1.70
—
—
E
—
—
E2
FM Transceiver
Copyright © 2007 by Silicon Laboratories
1.18.07
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
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