SI4704-D60 Datasheet, PDF (20/39 Pages) Silicon Laboratories – BROADCAST FM RADIO RECEIVER WITH RDS/RBDS

Si4704/05-D60
4. Functional Description
4.1. Overview
FM Antenna
FMI
RFGND
32.768 kHz
RCLK
2.7~5.5 V (QFN) / 2.0~5.5 V (SSOP) VA
+
GND
Si4704/05-D60
LNA
AGC
RDS
(Si4705) DIGITAL
AUDIO
LOW-IF
DOUT
DFS
GPO/DCLK
0/90
Mux
ADC
DAC
DSP
AFC
Mux
ADC
DAC
ROUT
LOUT
LDO
CONTROL
INTERFACE
VD
1.62 - 3.6 V
Figure 7. Functional Block Diagram
The Si4704/05-D60 CMOS FM radio receiver IC
integrates the complete tuner function from antenna
input to audio output. This feature enables a cost-
efficient digital audio platform for consumer electronics
applications with high TDMA noise immunity, superior
radio performance, and high fidelity audio power
amplification. Offering unmatched integration and PCB
space savings, the Si4704/05-D60 requires only few
external components and less than 15 mm² of board
area, excluding the antenna inputs. The Si4704/05-D60
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 FM solutions.
Leveraging Silicon Laboratories' proven and patented
Si4700/01 FM tuner's digital low intermediate frequency
(low-IF) receiver architecture, the Si4704/05-D60
delivers superior RF performance and interference
rejection in the FM bands. The high level of integration
and complete system production test simplifies design-
in, increases system quality, and improves reliability and
manufacturability.
The Si4704/05-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 Si4704/05-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 Si4704/05-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 Si4705-D60 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 Si4705-D60 enables
broadcast data such as station identification and song
name to be displayed to the user.
20
Rev. 1.2