Si4730/31/34/35-D60
Rev. 1.2 21
4. Functional Description
4.1. Overview
Figure 7. Functional Block Diagram
The Si473x-D60 digital CMOS AM/FM radio receiver IC
integrates the complete broadcast tuner and receiver
function from antenna input to digital audio output. The
device leverages the Silicon Labs broadcast proven
digital low-IF architecture, enabling a cost-effective
digital audio platform for consumer electronic
applications with high TDMA 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 mm
2
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 I
2
C-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.
ADC
Si473x-D60
DSP
DAC
LOUT
ROUT
AFC
GPO/DCLK
LDO
VA
2.7~5.5 V (QFN)
2.0~5.5 V (SSOP)
RDS
(Si4731/
35)
AMI
VD
1.62 - 3.6 V
SEN
CONTROL
INTERFACE
SCLK
LNA
AGC
LNA
AGC
GND
ADC
Mux
Mux
DAC
LOW-IF
SDIO
RST
DIGITAL
AUDIO
DFS
DOUT
RCLK
AM / LW
ANT
RFGND
FMI
FM / SW
ANT
+
(73 pages)
(119 pages)
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