SI4730-D60-GMR Datasheet, PDF (23/44 Pages) Silicon Laboratories – BROADCAST AM/FM/SW/LW RADIO RECEIVER

4. Functional Description
4.1. Overview
FM / SW
ANT
RIN
LIN
FMI
AM / LW
ANT
AMI
RFGND
2.7~5.5 V
VA
GND
LNA
AGC
LNA
AGC
LDO
Si4730/31/34/35-D60
Si473x-D60
RDS
(Si4731/
35)
DIGITAL
AUDIO
LOW-IF
DOUT
DFS
GPO/DCLK
Mux
ADC
DAC
DSP
Mux
ADC
DAC
ROUT
LOUT
AFC
CONTROL
INTERFACE
VD
1.62~3.6 V
Figure 7. Functional Block Diagram
The Si473x-D60 CMOS AM/FM radio receiver IC
integrates the complete tuner function from antenna
input to audio output, including a stereo audio AUXIN
ADC input for converting analog audio to digital signals.
This feature enables a cost-efficient digital audio
platform for consumer electronics applications with high
cell phone noise immunity, superior radio performance,
and high fidelity audio power amplification. Offering
unmatched integration and PCB space savings, the
Si473x-D60 requires only a few external components
and less than 15 mm² of board area, excluding the
antenna inputs. The Si473x-D60 AM/FM radio provides
the space savings and low power consumption
necessary for portable devices while delivering the high
performance and design simplicity desired for all
AM/FM solutions.
Leveraging Silicon Laboratories' proven and patented
Si4700/01 FM tuner's digital low intermediate frequency
(low-IF) receiver architecture, the Si473x-D60 delivers
superior RF performance and interference rejection in
the AM, FM, SW, and LW bands. The high level of
integration and complete system production test
simplifies design-in, increases system quality, and
improves reliability and manufacturability.
The Si473x-D60 is a feature-rich solution that includes
advanced seek algorithms, soft mute, auto-calibrated
digital tuning, FM stereo processing and advanced
audio processing.
In addition, the Si473x-D60 provides analog and digital
audio outputs and a programmable reference clock. The
device supports I²C-compatible 2-wire control interface,
and a Si4700/01 backwards-compatible 3-wire control
interface.
The Si473x-D60 utilizes digital signal processing to
achieve high fidelity, optimal performance, and design
flexibility. The chip provides excellent pilot rejection,
selectivity, and unmatched audio performance, and
offers both the manufacturer and the end-user
extensive programmability and a better listening
experience.
The Si4731/35 incorporates a digital signal processor
for the European Radio Data System (RDS) and the
North American Radio Broadcast Data System (RBDS)
including all required symbol decoding, block
synchronization, error detection, and error correction
functions. Using this feature, the Si4731/35 enables
broadcast data such as station identification and song
name to be displayed to the user.
Rev. 1.1
23