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Si4770/77-A20
4. Functional Description
4.1. Overview
Si4770/77
FMXIP
RF PKD
IF PKD
ADC
DSP
DAC
LOUT/
MPXOUT
FMXIN
ADC
DAC
ROUT
RFREG
R L
REG
DCLK
FMO
FMI
LNA
RF PKD
0°/90°
RDS
DFS
DOUT
RF PKD
AMI
INTB
RFGND
LNA
ClK
Gen
CNTRL
RSTB
VIO1
VIO2
Figure 7. Si4770/77-A20 Block Diagram
The Si4770/77-A20 radio receiver family employs 100%
RF CMOS technology to bring outstanding receiver
performance to the consumer electronics industry. The
Si4770/77-A20 receiver family supports worldwide radio
reception. The Si4770/77-A20 incorporates a digital pre-
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. The Si4777 supports AM/FM HD radio
channel reception with digital (I 2 S) Zero-IF (ZIF) I/Q
outputs for interface to an HD radio processor.
The family leverages Silicon Laboratories’ patented low-
IF digital architecture, delivering superior RF
performance and interference rejection. The low-IF
architecture delivers superior performance while
integrating the great majority of external components
required by competing solutions.
The proven digital techniques provide excellent
sensitivity in weak signal environments and superb
selectivity and intermodulation immunity in strong signal
environments. The solution offers dynamic AM/FM
channel bandwidth control, auto-calibrated digital
tuning, and proven AM/FM seek functionality based on
multiple signal quality and band parameters. The family
offers highly flexible and advanced audio processing
including programmable softmute, FM stereo-mono
blend, dynamic AM/FM channel bandwidth, AM/FM hi-
cut, FM hi-blend, and AM lo-cut filters. In addition, the
Si4770/77-A20 provides an integrated clock oscillator or
accepts a reference clock and an I 2 C-compatible, 2-wire
control interface. The Si4770/77-A20 receiver system
specifies a minimal bill of materials, resulting in a small
board space requirement and making the solution ideal
for any consumer electronics application from single
tuner radios to multiple tuner radios.
Rev. 0.9
23
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