Si4740/41/42/43/44/45-C10
A U TOMOTIVE AM/FM R ADIO R ECEIVER
Features
Digital audio output (I2S)
(Si4741/43/45 only)
24-pin 4 x 4 mm QFN package
Pb-free/RoHS compliant
Ordering Information:
See page 39.
Pin Assignments
Si4740/41/42/43/44/45-C10-GM
(Top View)
GPO2/INT
GPO3/DCLK
GPO1/AGC2
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
NC
NC
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
NC
24
23
22
21
20
19
FMI 1
18 DFS
RFGND 2
17 DOUT
AGC1 3
Applications
NC 4
OEM car audio systems
After-market car audio systems
16 LOUT
GND
PAD
15 ROUT
GND 5
14 GND
Functional Block Diagram
RDS
LNA
WEAK
SIGNAL
CONDITION
AGC
ADC
AMI
LNA
GND
AGC
10
11
12
RCLK
VIO
Patents pending
Si474x
FMI
9
SDIO
The Si474x AM/FM receiver family is the most highly integrated automotive grade
and performance solution available.
8
SEN
13 VDD
7
SCLK
Description
RST
AMI 6
DOUT
DIGITAL
AUDIO
DFS
DCLK
DAC
ROUT
DAC
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.
LOUT
DSP
ADC
AGC
VDD
AFC
Rev. 1.0 9/09
QUALITY
DETECTOR
CNTRL
GPO1-3
VIO
RST
RCLK
GND
LDO
SEN
SCLK
SDIO
3.0–3.6 V
Copyright © 2009 by Silicon Laboratories
Si4740/41/42/43/44/45