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SI4831 Datasheet(PDF) 10 Page - Silicon Laboratories

Part # SI4831
Description  BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVER
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI4831 Datasheet(HTML) 10 Page - Silicon Laboratories

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Si4831/35-B30
10
Rev. 1.0
4. Functional Description
Figure 2. Si4831/35-B30 Functional Block Diagram
4.1. Overview
The Si4831/35-B30 is the industry's most advanced
fully
integrated,
mechanical-tuned
100%
CMOS
AM/FM/SW radio receiver IC. Offering unmatched
integration and PCB space savings, the Si4831/35-B30
requires minimum external components and a small
board area. The Si4831/35-B30 AM/FM/SW radio
provides space savings and low power consumption
while delivering the high performance and design
simplicity desired for all AM/FM/SW solutions.
Leveraging Silicon Laboratories' proven and patented
digital low intermediate frequency (low-IF) receiver
architecture, the Si4831/35-B30 delivers superior RF
performance and interference rejection in AM, FM, and
SW bands. The high integration and complete system
production test simplifies design-in, increases system
quality, and improves manufacturability.
4.2. FM Receiver
The Si4831/35-B30 integrates a low noise amplifier
(LNA) supporting the worldwide FM broadcast band (64
to 109 MHz).
Pre-emphasis and de-emphasis is a technique used by
FM broadcasters to improve the signal-to-noise ratio of
FM receivers by reducing the effects of high frequency
interference and noise. When the FM signal is
transmitted, a pre-emphasis filter is applied to
accentuate the high audio frequencies. All FM receivers
incorporate a de-emphasis filter which attenuates high
frequencies to restore a flat frequency response. Two
time constants are used in various regions. The de-
emphasis time constant can be chosen to be 50 or
75 µs. Refer to "AN555: Si483x-B Antenna, Schematic,
Layout, and Design Guidelines."
The Si4831/35-B30 also has advanced stereo blending
that employs adaptive noise suppression. As a signal
quality
degrades,
the
Si4831/35-B30
gradually
combines the stereo left and right audio channels to a
mono audio signal to maintain optimum sound fidelity
under varying reception conditions. The Si4831/35-B30
can drive a stereo light with the stereo/mono information
so that the user can easily discern the signal quality.
Si4830/34
ADC
ADC
DSP
DAC
DAC
ROUT
LOUT
AFC
Si4831/35
RFGND
LNA
AMI
AGC
REG
VDD1/2
2.0~3.6V
XTAL
OSC
FMI
0/90
ADC
XTALI
AM
ANT
FM/SW
ANT
CONTROL
INTERFACE
TUNE 1/2
BAND


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