SI4827-A10 Datasheet, PDF (13/25 Pages) Silicon Laboratories – BROADCAST ANALOG TUNING DIGITAL DISPLAY AM/FM/SW RADIO RECEIVER

4. Functional Description
AM
ANT
FM
ANT
AMI
RFGND
FMI
LNA
AGC
0/90
XTALI
2.0~3.6V _VDD
AFC
REG
XTAL
OSC
Si4827-A10
Si4^S8ⁱ⁴3⁸²0⁷/34
ADC
DSP
DAC
ADC
AOUT
ADC
CONTROL INTERFACE
TUNE1/2
BAND
Figure 4. Si4827-A10 Functional Block Diagram
4.1. Overview
The Si4827-A10 is the entry level analog-tuned digital-
display digital CMOS AM/FM/SW radio receiver IC that
integrates the complete receiver function from antenna
input to audio output. Working with an external MCU
with LCD/LED driver, Si4827 can output the AM/FM/SW
frequencies and band and volume information to display
on LCD/LED, while using a simple potentiometer at the
front end for analog-tune. Leveraging Silicon
Laboratories' proven and patented digital low
intermediate frequency (low-IF) receiver architecture,
the Si4827 delivers superior RF performance and
interference rejection in AM, FM and SW bands.
Additionally, the digital core provides advanced audio
conditioning for all environments, removing pops, clicks,
and loud static in variable signal conditions. The
superior control algorithm integrated in Si4827 provides
easy and reliable control interface while eliminating all
the manual tuned external components used in
traditional solutions.
Like other successful audio products from Silicon Labs,
Si4827 offers unmatched integration and PCB space
savings with minimum external components and a small
board area on a single side PCB. The high integration
and complete system production test simplifies design-
in, increases system quality, and improves
manufacturability. The receiver has very low power
consumption, runs off two AAA batteries, and delivers
the performance benefits of high performance digital
radio experience with digital display to the legacy
analog-tuned radio market.
The Si4827 provides good flexibility in using the chip.
The frequency range of FM/AM/SW bands, de-
emphasis value, AM tuning step, and AM soft mute
level/rate can be either configured by the MCU or by
using external hardware to make a selection. The
reference clock of the FM tuner can be provided by
either the crystal or by the host MCU within tolerance.
The Si4827 also has flexibility in selecting bands and
configuring band properties, enabling masked Host
MCU for multiple projects, and reducing the cost of
development. Four tuning preferences are available to
meet different tuning preference requirements.
Rev. 1.0
13