Si4740/41/42/43/44/45-C10
A
U TOMOTIVE
AM/FM R
ADIO
R
ECEIVER
Features
Worldwide FM band support
(64–108 MHz)
Worldwide AM band support
(520–1710 kHz)
LW band support (153–288 kHz)
(Si4742/43/44/45 only)
MW (520–1710 kHz) and
SW (2.3–30 MHz) support
(Si4742/43/44/45 only)
NOAA weather band support
(162.4–162.55 MHz) (Si4742/43 only)
FM multipath detection and mitigation
AM/FM noise blanker
(Si4742/43/44/45 only)
Received signal quality indicators (RSSI,
SNR, frequency offset, multi-path
interference)
AM and FM programmable seek tuning
AM and FM programmable soft mute
control
FM Hi-cut control (Si4742/43/44/45 only)
Power line noise rejection/AM lo-cut filter
FM programmable stereo-mono blend
GPO1/AGC2
Digital audio output (I
2
S)
(Si4741/43/45 only)
24-pin 4 x 4 mm QFN package
Pb-free/RoHS compliant
24
FMI 1
RFGND 2
AGC1 3
NC 4
23
22
21
20
19
18 DFS
17 DOUT
GPO3/DCLK
16 LOUT
15 ROUT
14 GND
13 VDD
12
VIO
AM and FM programmable
channel bandwidth filters
Digital FM stereo decoder
Advanced patented RDS/RBDS
processor (Si4741/43/45 only)
Automatic gain control (AGC)
Integrated AM and FM low-noise
amplifier (LNA)
Image-rejection mixer
Frequency synthesizer with
integrated voltage controlled
oscillator (VCO)
Low-IF conversion with no
external ceramic filters
3.0 to 3.6 V supply voltage
Programmable reference clock
AECQ-100 qualified
–40 to 85 ºC operation
Ordering Information:
See page 39.
Pin Assignments
Si4740/41/42/43/44/45-C10-GM
(Top View)
GPO2/INT
11
RCLK
NC
NC
8
SEN
Applications
OEM car audio systems
After-market car audio systems
GND 5
AMI 6
Description
The Si474x AM/FM receiver family is the most highly integrated automotive grade
and performance solution available.
7
RST
NC
9
SCLK
GND
PAD
10
SDIO
Functional Block Diagram
Si474x
FMI
RDS
LNA
AGC
ADC
AMI
GND
AGC
AGC
3.0–3.6 V
VDD
GND
LDO
AFC
QUALITY
DETECTOR
WEAK
SIGNAL
CONDITION
Patents pending
Note:
To ensure proper operation and
receiver performance, follow the
guidelines in “AN400: Si474x
AM/FM Receiver Layout Guide.”
Silicon Laboratories will evaluate
schematics and layouts for
qualified customers.
DOUT
DIGITAL
AUDIO
DFS
DCLK
DAC
DSP
ROUT
LNA
ADC
DAC
LOUT
GPO1-3
VIO
RST
CNTRL
Rev. 1.0 9/09
Copyright © 2009 by Silicon Laboratories
RCLK
SEN
SCLK
SDIO
Si4740/41/42/43/44/45
Si4740/41/42/43/44/45-C10
2
Rev. 1.0
Si4740/41/42/43/44/45-C10
T
ABLE
Section
OF
C
ONTENTS
Page
1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
2. Typical Application Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3. Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4. Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20
4.2. Block Diagram and Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.3. FM Receiver Front-end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.4. AM Receiver Front-end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.5. Received Signal Qualifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.6. Digital Audio Interface (Si4741/43/45 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.7. Stereo Audio Processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.8. De-emphasis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.9. Stereo DACs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.10. Soft Mute . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.11. Seek and Valid Station Qualification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.12. FM Hi-Cut Control (Si4742/43/44/45 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
4.13. AM/FM Noise Blanker (Si4742/43/44/45 only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.14. Programming Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.15. Reset, Powerup, and Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.16. GPO 1–3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
4.17. RDS/RBDS Advanced Processor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.18. Reference Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
4.19. Control Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5. Commands and Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6. Pin Descriptions: Si4740/41/42/43/44/45-C10-GM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
8. Package Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.1. Si4740/41/42/43/44/45-C10 Top Mark . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
8.2. Top Mark Explanation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
9. Package Outline: Si4740/41/42/43/44/45-C10 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
10. PCB Land Pattern: Si4740/41/42/43/44/45-C10 QFN . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
11. Additional Reference Resources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Document Change List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Rev. 1.0
3
Si4740/41/42/43/44/45-C10
1. Electrical Specifications
Table 1. Recommended Operating Conditions
Parameter
Supply Voltage
Interface Supply Voltage
Power Supply Powerup Rise Time
Interface Power Supply Powerup
Rise Time
Ambient Temperature
Symbol
V
DD
V
IO
V
DDRISE
V
IORISE
T
A
Test Condition
Min
3.0
2.7
10
10
–40
Typ
—
—
—
—
25
Max
3.6
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)
–45 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 above 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 Si4740/41/42/43/44/45-C10 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, GPO1, GPO2, and GPO3.
4.
At RF input pins, FMI and AMI.
4
Rev. 1.0
Si4740/41/42/43/44/45-C10
Table 3. DC Characteristics
(V
DD
= 3.0 to 3.6 V, V
IO
= 2.7 to 3.6 V, T
A
= –40 to 85 °C)
Parameter
FM Mode
Supply Current
WB Mode
(Si4742/43 only)
Supply Current
AM Mode
Supply Current
Supplies and Interface
Interface Supply Current
Powerdown Current
1,2
Interface Powerdown Current
1
High Level Input Voltage
3
Low Level Input Voltage
3
High Level Input Current
3
Low Level Input Current
3
High Level Output Voltage
4
Low Level Output Voltage
4
Symbol
Test Condition
Min
Typ
Max
Unit
I
FM
I
FM
I
AM
I
IO
I
PD
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
SCLK, DFS, DCLK,
RCLK inactive
—
26
28.6
mA
—
20
23
mA
—
19
23
mA
—
—
—
0.7 x V
IO
—
–10
–10
0.8 x V
IO
—
300
6
6
—
—
—
—
—
—
400
12
12
—
0.3 x V
IO
10
10
—
0.2 x V
IO
µA
µA
µA
V
V
µA
µA
V
V
Notes:
1.
Specifications are guaranteed by characterization.
2.
Refer to Section "4.19. Control Interface" on page 35.
3.
For input pins SCLK, SEN, SDIO, RST, and RCLK.
4.
For output pins SDIO, DFS, GPO1, GPO2, and GPO3.
Rev. 1.0
5
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