Si4712/13
FM Radio Transmitter with Receive Power Scan
Description
The Si4712/13 is the industry's first 100% CMOS FM
radio transmitter with an integrated receiver to
measure receive signal strength. 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 Si4712/13 offers
industry leading size, performance, low power
consumption, and ease of use.
The Si4712/13’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
Si4712/13.
The Si4713 supports the European Radio Data
System (RDS) and the US Radio Broadcast Data
System (RBDS) standards including all the symbol
encoding, block synchronization, and error correction
functions. Using this feature, the Si4713 enables
data such as artist name and song title to be
transmitted to an RDS/RBDS receiver.
Users are responsible for adjusting their system’s
radiated power levels to comply with local regulations
on RF transmission (FCC, ETSI, ARIB, etc.).
Features
-
Integrated receiver for receive power measurement
-
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 (Si4713 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
Si4712/13
PEAK
DETECT
DIGITAL
AUDIO
DSP
Tx
Ant
L1
120 nH
DIN
DFS
DAC
TXO
RFGND
DAC
ADC
LIN
ADC
RIN
AFC
CONTROL
INTERFACE
GPO
RDS (Si4713)
VDD 2.7–5.5 V
LDO
GND
C1
22 nF
FM Tuner
Copyright © 2008 by Silicon Laboratories
GPO3/
DCLK
GPO2/
INT
GPO1
RCLK
SDIO
VIO
RST
SCLK
SEN
4.3.08
Si4712/13
FM Radio Transmitter with Receive Power Scan
Selected Electrical Specifications
Parameter
Transmit Frequency Range
Programmable Transmit Output Voltage,
TXO
Transmit Voltage Accuracy
Transmit Voltage Step
Transmit Channel Edge Power
Transmit Adjacent Channel Power
Pre-Emphasis Time Constant
Audio SNR Mono
Audio THD Mono
Audio Stereo Separation
Sub Carrier Rejection Ratio
Input Signal Level (0 dB)
Audio Bandwidth (3 dB)
Audio Imbalance
Powerup Settling Time
Supply Voltage
Interface Supply Voltage
TX Supply Current
TX Interface Supply Current
V
DD
V
IO
I
TX
I
IO
FM TX from Line Input
From Powerdown
SCR
V
AI
TX_PREMPHASIS = 75 µs
TX_PREMPHASIS = 50 µs
V
RF
= 102–118 dBµV
Symbol
f
RF
Test Condition
Min
76
—
–2.5
—
—
—
70
45
—
—
30
40
—
30
–1
—
2.7
1.5
—
—
Typ
—
118
—
1
—
–30
75
50
63
0.1
35
50
—
—
—
—
—
—
18.8
320
Max
108
—
2.5
2
–20
–26
80
54
—
0.5
—
—
0.636
15 k
1
110
5.5
3.6
22.8
600
Unit
MHz
dBµV
dB
dB
dBC
dBC
µs
µs
dB
%
dB
dB
V
pk
Hz
dB
ms
V
V
mA
µA
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 © 2008 by Silicon Laboratories
4.3.08
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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