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PDF Si4836-A10 Data sheet ( Hoja de datos )
| Número de pieza | Si4836-A10 | |
| Descripción | BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVER | |
| Fabricantes | Silicon Laboratories | |
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Si4836-A10
BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVER
Features
Worldwide FM band support
(64–109 MHz)
Worldwide AM band support
(504–1750 kHz)
SW band support
(2.3–28.5 MHz)
No manual alignment necessary
Stereo audio output
Selectable support AM/FM/SW
regional bands
Enhanced FM/SW band coverage
Station and stereo LED indicators
China TV channels audio carrier
reception in FM band
Automatic frequency control (AFC)
Integrated LDO regulator
2.0 to 3.6 V supply voltage
Wide range of ferrite loop sticks and
air loop antennas supported
16-pin SOIC
RoHS-compliant
Bass/Treble control
EN55020 compliant
Applications
Table and portable radios
Mini/micro systems
CD/DVD players
Boom boxes
Modules
Clock radios
Mini HiFi
Entertainment systems
Description
The Si4836 is the high performance receiver function from antenna input to audio
output. The Si4836 extends Silicon Laboratories multi-band tuner family, and
further increases the ease and attractiveness of design radio reception to audio
devices through small size and board area, minimum component count, and
superior, proven performance. Si4836 enhances the FM and SW band coverage,
further supports China TV channels audio reception in FM band. The Si4836
removes any requirements for manually tuning components during the
manufacturing process. The receiver has very low power consumption, runs off
two AAA batteries, and delivers the performance benefits of digital tuning to the
analog radio market.
Functional Block Diagram
AM
ANT
FM
ANT
AMI
RFGND
FMI
XTALI
2.0~3.6V VDD
LNA
AGC
0/90
AFC
REG
XTAL
OSC
Si4836
ADC DAC
DSP
ADC DAC
CONTROL INTERFACE
ADC
LOUT
ROUT
TUNE1/2
BAND
Ordering Information:
See page 14.
Pin Assignments
Si4836-A10 (SOIC)
LOUT
TUNE1
TUNE2
BAND
NC
FMI
RFGND
AMI
1
2
3
4
5
6
7
8
16 ROUT
15 GND
14 VDD
13 XTALI
12 XTALO
11 STATION
10 STEREO/LNA_EN
9 RST
This product, its features, and/or its
architecture is covered by one or more of
the following patents, as well as other
patents, pending and issued, both
foreign and domestic: 7,127,217;
7,272,373; 7,272,375; 7,321,324;
7,355,476; 7,426,376; 7,471,940;
7,339,503; 7,339,504.
Rev. 1.0 5/13
Copyright © 2013 by Silicon Laboratories
Si4836-A10
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
1 page  
Si4836-A10
Table 3. Reset Timing Characteristics
(VDD = 2.7 to 3.6 V, TA = –15 to 85 °C)
Parameter
Symbol Min Typ
RSTB Pulse Width
VDD Valid Time Before RSTB Rises
RSTB Low Time Before VDD Becomes Invalid
tPRST 100 —
tSRST 100 —
tRRST 0 —
Notes:
1. RSTB must be held low for at least 100 µs after the voltage supply has been ramped up.
2. RSTB needs to be asserted (pulled low) prior to the supply voltage being ramped down.
Max
—
—
—
Unit
µs
µs
µs
tSRST
tPRST
tRRST
VDD
RSTB
Figure 1. Reset Timing
Rev. 1.0
5
5 Page 
4. Functional Description
AM
ANT
FM
ANT
AMI
RFGND
FMI
LNA
AGC
0/90
XTALI
2.0~3.6V VDD
AFC
REG
XTAL
OSC
Si4836-A10
Si4836
ADC DAC
DSP
ADC DAC
CONTROL INTERFACE
ADC
LOUT
ROUT
TUNE1/2
BAND
Figure 2. Si4836 Functional Block Diagram
4.1. Overview
The Si4836 is the high performance mechanical-tuned
digital CMOS AM/FM/SW radio receiver IC that
integrates the complete receiver function from antenna
input to audio output. The Si4836 extends Silicon
Laboratories multi-band tuner family, and further
increases the ease and attractiveness of design radio
reception to audio devices through small size and board
area, minimum component count, and superior, proven
performance. The Si4836 enhances the FM and SW
band coverage and further supports China TV channels
audio reception in FM band. The Si4836 removes any
requirements for manually tuning components during
the manufacturing process.
Leveraging Silicon Laboratories' proven and patented
digital low intermediate frequency (low-IF) receiver
architecture, the Si4836 delivers desired 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 Si4836 integrates a low noise amplifier (LNA)
supporting the worldwide FM broadcast band (64 to
109 MHz) and the TV audio stations within the
frequency range in China area are also supported.
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 "AN738: Si4825/36-A Antenna,
Schematic, Layout, and Design Guidelines.”
The Si4836 also has advanced stereo blending that
employs adaptive noise suppression. As a signal quality
degrades, the Si4836 gradually combines the stereo left
and right audio channels to a mono audio signal to
maintain optimum sound fidelity under varying reception
conditions. The Si4836 can drive a stereo light with the
stereo/mono information so that the user can easily
Rev. 1.0
11
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