Si4712/13-B30
F M R
A DI O
T
R A N S M I T T E R W I T H
R
E C E I V E
P
O W E R
S
C A N
Features
Integrated receive power
measurement
Worldwide FM band support
(76–108 MHz)
Requires only two external
components
Frequency synthesizer with
integrated VCO
Digital stereo modulator
Programmable pre-emphasis
Analog/digital audio interface
Audio silence detector
Programmable reference clock
RDS/RBDS encoder (Si4713 only)
PCB loop and stub antenna
support with self-calibrated
capacitor tuning
Programmable transmit level
Audio dynamic range control
Advanced modulation control
2.7 to 5.5 V supply voltage
Integrated LDO regulator
3 x 3 x 0.55 mm 20-pin QFN
Pb-free and RoHS Compliant
Designed for compatibility with
cellular operation
Ordering Information:
See page 34.
Pin Assignments
Applications
The Si4712/13-B30 integrates the complete transmit functions for
standards-compliant unlicensed FM broadcast stereo transmission. The
chip also allows integrated receive power scanning to identify low signal
power FM channels. Users must comply with local regulations on radio
frequency (RF) transmission.
NC
1
20 19 18 17 16
15 RIN
NC 2
RFGND 3
TXO 4
RST 5
GND
PAD
7
SCLK
8
SDIO
9
RCLK
Functional Block Diagram
6
SEN
10 11 VDD
VIO
Si4712/13
PEAK
DETECT
DIGITAL
AUDIO
DSP
Tx
Ant
L1
120 nH
DIN
DFS
Patents pending
Note:
To ensure proper operation and
performance, follow the guide-
lines in “AN383: Universal
Antenna Selection and Layout
Guidelines.” Silicon Laboratories
will evaluate schematics and lay-
outs for qualified customers.
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
Rev. 1.1 2/08
Copyright © 2008 by Silicon Laboratories
GPO3/
DCLK
GPO2/
INT
GPO1
RCLK
SDIO
VIO
SCLK
SEN
RST
Si4712/13-B30
LIN
14 DFS
13 DIN
12 GND
NC
Description
GPO3/DCLK
GPO2/INT
Cellular handsets/hands-free
MP3 players
Portable media players
Si4712/13-B30
(Top View)
Wireless speakers/microphone
Satellite digital audio radios
Personal computers/notebooks
GPO1
Si4712/13-B30
T
ABLE
Section
OF
C
ONTENTS
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Test Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.1. Test Circuit Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2.2. Test Circuit Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3. Typical Application Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1. Analog Audio Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2. Digital Audio Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.3. Typical Application Schematic Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4. Universal AM/FM RX/FM TX Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
4.1. Universal AM/FM RX/FM TX Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2. FM Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.3. Receive Power Scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
5.4. Digital Audio Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.5. Line Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.6. Audio Dynamic Range Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.7. Audio Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.8. Pre-emphasis and De-emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.9. RDS/RBDS Processor (Si4713 Only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.10. Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.11. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.12. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.13. GPO Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.14. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.15. Programming with Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7. Pin Descriptions: Si4712/13-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
8. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
9. Package Markings (Top Marks) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.1. Si4712 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.2. Si4713 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9.3. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
10. Package Outline: Si4712/13-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
11. PCB Land Pattern: Si4712/13-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37
12. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Rev. 1.1
3
Si4712/13-B30
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
Supply Voltage
Interface Supply Voltage
Power Supply Powerup Rise Time
Interface Supply Powerup Rise
Time
Ambient Temperature
Symbol
V
DD
V
IO
V
DDRISE
V
IORISE
T
A
Test Condition
Min
2.7
1.5
10
10
–20
Typ
—
—
—
—
25
Max
5.5
3.6
—
—
85
Unit
V
V
µs
µs
C
Note:
All minimum and maximum specifications are guaranteed and apply across the recommended operating conditions.
Typical values apply at V
DD
= 3.3 V and 25
C
unless otherwise stated. Parameters are tested in production unless
otherwise stated.
Table 2. Absolute Maximum Ratings
1,2
Parameter
Supply Voltage
Interface Supply Voltage
Input Current
3
Input Voltage
3
Operating Temperature
Storage Temperature
RF Input Level
4
Symbol
V
DD
V
IO
I
IN
V
IN
T
OP
T
STG
Value
–0.5 to 5.8
–0.5 to 3.9
10
–0.3 to (V
IO
+ 0.3)
–40 to 95
–55 to 150
0.4
Unit
V
V
mA
V
C
C
V
PK
Notes:
1.
Permanent device damage may occur if the absolute maximum ratings are exceeded. Functional operation should be
restricted to the conditions as specified in the operational sections of this data sheet. Exposure beyond recommended
operating conditions for extended periods may affect device reliability.
2.
The Si4712/13 devices are high-performance RF integrated circuits with certain pins having an ESD rating of < 2 kV
HBM. Handling and assembly of these devices should only be done at ESD-protected workstations.
3.
For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, DFS, DIN, GPO1, GPO2/INT, and GPO3.
4.
At RF input pin, TXO.
4
Rev. 1.1
Si4712/13-B30
Table 3. DC Characteristics
Test conditions: V
RF
= 118 dBµV, stereo,
f
= 68.25 kHz,
fpilot
= 6.75 kHz, REFCLK = 32.768 kHz, unless otherwise specified.
Production test conditions: V
DD
= 3.3 V, V
IO
= 3.3 V, T
A
= 25 °C, F
RF
= 98 MHz.
Characterization test conditions: V
DD
= 2.7 to 5.5 V, V
IO
= 1.5 to 3.6 V, T
A
= –20 to 85 °C, F
RF
= 76–108 MHz.
Parameter
FM Transmitter from Line Input
TX Supply Current
TX Interface Supply Current
Symbol
Test Condition
Min
Typ
Max
Unit
I
TX
I
IO
—
—
18.8
320
22.8
600
mA
µA
FM Transmitter from Digital Audio Input
TX Supply Current
TX Interface Supply Current
I
DTX
I
DIO
DCLK = 3.072 MHz
DCLK = 3.072 MHz
—
—
18.3
320
—
—
mA
µA
FM Transmitter in Receive Power Scan Mode
RX Supply Current
RX Interface Supply Current
Supplies and Interface
V
DD
Powerdown Current
V
IO
Interface Powerdown Current
High Level Input Voltage
1
Low Level Input Voltage
1
High Level Input Current
1
Low Level Input Current
1
High Level Output Voltage
2
Low Level Output Voltage
2
I
DD
I
IO
V
IH
V
IL
I
IH
I
IL
V
OH
V
OL
V
IN
=
V
IO
= 3.6 V
V
IN
= 0 V, V
IO
= 3.6 V
I
OUT
= 500 µA
I
OUT
= –500 µA
Powerdown mode
SCLK, RCLK inactive
Powerdown mode
—
—
0.7 x
V
IO
–0.3
–10
–10
0.8 x
V
IO
—
10
3
—
—
—
—
—
—
20
10
V
IO
+ 0.3
I
RX
I
IO
—
—
16.8
320
—
—
mA
µA
µA
µA
V
V
µA
µA
V
V
0.3 x
V
IO
10
10
—
0.2 x
V
IO
Notes:
1.
For input pins SCLK, SEN, SDIO, RST, RCLK, DCLK, DFS, DIN, GPO1, GPO2/INT, and GPO3.
2.
For output pins SDIO, GPO1, GPO2/INT, and GPO3.
Rev. 1.1
5
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