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Silicon Laboratories
Silicon Laboratories

SI4701 Datasheet

(SI4700 / SI4701) Broadcast FM Radio Tuner


SI4701 Datasheet Preview


Si4700/01
Broadcast FM Radio Tuner for Portable Applications
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The Si4700 is the industry's first FM radio tuner IC to
leverage digital integration and 100% CMOS process
technology, resulting in a completely integrated solution
that requires only one external supply bypass capacitor
and less than 20 mm2 of board space. Offering unmatched
integration, the Si4700 allows FM radio reception to be
added to a variety of portable devices where board space,
performance, low power consumption, and ease of use are
essential.
Leveraging Silicon Laboratories' proven Aero® digital low
intermediate frequency (low-IF) receiver architecture and
frequency synthesizer technology, the Si4700 delivers
superior RF performance and interference rejection. Digital
signal processing is utilized to provide optimum sound
quality with varying reception conditions.
The high integration and complete system production test
simplifies design-in, increases quality, and improves
manufacturing. The Si4700 also uses a streamlined
programming model, which further reduces product
development time. Power management is also simplified
with an integrated regulator allowing direct connection to a
2.7 to 5.5 V battery.
The Si4701 incorporates a digital processor for the
European Radio Data System (RDS) and the US Radio
Broadcast Data System (RBDS) including all required
symbol decoding, block synchronization, error detection,
and error correction functions. Using this feature, the
Si4701 enables data such as station identification and
song name to be displayed to the user.
Features
- Worldwide FM band support (76–108 MHz)
- Digital low-IF receiver
- Frequency synthesizer with integrated VCO
- Seek tuning
- Automatic frequency control (AFC)
- Automatic gain control (AGC)
- Excellent overload immunity
- Signal strength measurement
- Programmable de-emphasis (50/75 µs)
- Adaptive noise suppression
- Volume control
- Line-level analog output
- 32.768 kHz reference clock
- RDS/RBDS processor (Si4701 only)
- 2-wire and 3-wire control interface
- 2.7 to 5.5 V supply voltage
- Integrated LDO regulator allows direct connection
to battery
- 4x4 mm 24-pin QFN package
- Lead-free/RoHS compliant
Applications
- Cellular handsets
- MP3 players
- PDAs, Notebook PCs
- Portable radios
- USB FM radio
Headphone
Cable
FMIP
FMIN
Si4700/01
I
ADC
DSP
DAC LOUT
PGA
FILTER
DEMOD
Q
ADC
MPX
AUDIO
DAC
ROUT
32.768 kHz
RCLK
2.7 - 5.5 V
VA
VD
AGC
TUNE
REG
0 / 90
AFC
LOW-IF GPIO
RDS
(Si4701)
RSSI
GPIO
VIO
RST
SDIO
SCLK
SEN
FM Tuner
Copyright © 2005 by Silicon Laboratories
7.11.05
Page 1

Si4700/01
Broadcast FM Radio Tuner for Portable Applications
wwSwe.lDeactatSehdeeEt4lUe.ccotmrical Specifications
Parameter
Input Frequency
Sensitivity
RDS Sensitivity
Input IP3
Adjacent Channel Selectivity
Alternate Channel Selectivity
RCLK Frequency
RCLK Frequency Tolerance
Audio Output Voltage
Audio Band Limits
Audio S/N
Audio THD
Supply Voltage
Interface Supply Voltage
Ambient Temperature
Supply Current
Powerdown Current
Seek Time
SCLK Frequency
Powerup Time
Symbol
fRF
VD, VA
VIO
TA
IAD
IPD
fCLK
fSCL
Test Condition
(S+N)/N = 26 dB
f = 2 kHz, RDS BLER = 5%
|f2 – f1| > 1 MHz; f0 = 2 x f1 – f2
AGC disabled
±200 kHz
±400 kHz
0 to –3 dB
3-wire operation
2-wire operation
From powerdown
Min
76
35
60
–200
72
30
2.7
1.5
–20
0
0
Typ
2.5
15
108
50
70
32.768
80
63
0.1
25
17.6
4
Max
108
3.5
200
90
15k
0.5
5.5
3.6
85
20
40
2.5
400
50
Unit
MHz
µV EMF
µV EMF
dBµV
dB
dB
kHz
ppm
mVrms
Hz
dB
%
V
V
°C
mA
µA
ms/channel
MHz
kHz
ms
Pin Assignments
Package Information
24 23 22 21 20 19
GND 1
18 VA
FMIP 2
17 GND
RFGND 3
FMIN 4
GND
PAD
16 LOUT
15 ROUT
GND 5
14 GND
GND 6
13 VD
7 8 9 10 11 12
Symbol
A
A1
b
D, E
D2, E2
e
Min
0.80
0.00
0.18
2.20
Millimeters
Nom
0.85
0.02
0.25
4.00 BSC
2.30
0.50 BSC
Max
0.90
0.05
0.30
2.40
Symbol
L
L1
aaa
bbb
ccc
ddd
Min
0.30
0.03
Millimeters
Nom
0.40
0.05
Max
0.50
0.08
0.10
0.10
0.08
0.10
FM Tuner
Copyright © 2005 by Silicon Laboratories
7.11.05
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
Page 2
Part Number SI4701
Manufactur Silicon Laboratories
Description (SI4700 / SI4701) Broadcast FM Radio Tuner
Total Page 2 Pages
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