Si4710/11
FM Radio Transmitter for Portable Applications
Description
The Si4710/11 is the industry's first 100% CMOS FM
transmitter single chip IC. The device leverages
Silicon Labs’ highly successful and proven Si4700/01
FM receiver, and offers unmatched integration and
performance allowing FM transmit to be added to any
portable device by using a single chip. As with the
Si4700/01, the Si4710/11 offers industry leading size,
performance, low power consumption, and ease of
use.
The Si4710/11’s digital integration reduces the
required external components of traditional offerings,
resulting in a solution requiring only an external
inductor and bypass capacitor, and PCB space of
approximately 15 mm
2
. High reliability in device
manufacturing, improved quality, easy design-in, and
software programmability are key advantages of the
Si4710/11.
The Si4711 supports the European Radio Data
System (RDS) and the US Radio Broadcast Data
System (RBDS) including all the symbol encoding,
block synchronization, and error correction functions.
Using this feature, the Si4711 enables data such as
artist name and song title to be transmitted to an
RDS/RBDS receiver.
Users are responsible to adjust their system’s
radiated power levels to comply with local regulations
on RF transmission (FCC, ETSI, ARIB, etc.).
Features
-
Worldwide FM band support
(76–108 MHz) for transmit
-
Requires only two external components
-
Frequency synthesizer with integrated VCO
-
Digital stereo modulator
-
Programmable pre-emphasis
(50/75 µs)
-
Analog/digital audio interface
-
Programmable reference clock
-
RDS/RBDS transmit encoder (Si4711 only)
-
PCB loop antenna support with self calibrated
capacitor tuning
-
Programmable transmit level
-
Programmable modulation
-
2.7 to 5.5 V supply voltage
-
Digital gain compression
-
Integrated LDO regulator
-
3 x 3 x 0.55 mm 20-pin QFN
-
Pb-free and RoHS Compliant
Applications
-
-
-
-
-
-
Cellular handsets/hands-free
MP3 players
Portable audio/video players
Wireless speakers/microphone
Satellite digital audio radios
Personal computers/notebooks
DFS
DIN
LIN
ADC
DIGITAL
AUDIO
DAC
DSP
Si471x
TXO
DAC
RFGND
Tx
Ant
L1
120 nH
RIN
ADC
2. 7– 5.5 V
VDD
GND
LDO
C1
22 nF
GPO
RDS (Si4711)
CONTROL
INTERFACE
AFC
SDIO
SCLK
VIO
GPO2/IRQ
FM Tuner
Copyright © 2007 by Silicon Laboratories
GPO3/DCLK
RCLK
GPO1
SEN
RST
1.8.07
Si4710/11
FM Radio Transmitter for Portable Applications
Selected Electrical Specifications
Parameter
Transmit Frequency Range
Programmable Transmit Output Voltage,
TXO (Maximum Voltage)
Programmable Transmit Output Voltage,
TXO (Minimum Voltage)
Transmit Voltage Stability
Transmit Voltage Step
Transmit Channel Edge Power
Transmit Adjacent Channel Power
Pre-emphasis Time Constant
Audio SNR
Audio THD
Audio Stereo Separation
Sub Carrier Rejection Ratio
Input Signal Level (0 dB)
Audio Bandwidth (3 dB)
Audio Imbalance
Powerup Settling Time
From powerdown
SCR
V
AI
0.6 V
RMS
input,
V
IO
= 1.8 V
FMPE[1:0] = 00
FMPE[1:0] = 01
Symbol
f
RF
Test Condition
Min
76
—
—
–1
—
—
—
70
45
—
—
30
—
—
20
–1
—
Typ
—
115
83
—
1
—
–30
75
50
63
0.1
35
–50
—
—
—
110
Max
108
—
—
1
2
–20
–26
80
54
—
0.5
—
–40
0.636
15 K
1
—
Unit
MHz
dBµV
dBµV
dB
dB
dBC
dBC
us
us
dB
%
dB
dB
V
pk
Hz
dB
ms
Pin Assignments
GPO3/DCLK
GPO2/IRQ
GPO1
Package Information
NC
1
20 19 18 17 16
15 RIN
NC 2
RFGND 3
TXO 4
RST 5
6
SEN
7
SCLK
8
SDIO
9
RCLK
GND
PAD
10 11 VDD
VIO
Symbol
A
A1
b
c
D
D2
e
E
E2
Min
0.50
0.00
0.20
0.27
1.65
Millimeters
Nom
0.55
0.02
0.25
0.32
3.00 BSC
1.70
0.50 BSC
3.00 BSC
1.70
Symbol
Max
0.60
0.05
0.30
0.37
1.75
Min
f
L
L1
aaa
bbb
ccc
ddd
eee
0.35
0.00
—
—
—
—
—
Millimeters
Nom
2.53 BSC
0.40
—
—
—
—
—
—
LIN
14 DFS
13 DIN
12 GND
NC
Max
0.45
0.10
0.05
0.05
0.08
0.10
0.10
1.65
1.75
FM Tuner
Copyright © 2007 by Silicon Laboratories
1.8.07
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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