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PDF Si4824-A10-CU Data sheet ( Hoja de datos )
| Número de pieza | Si4824-A10-CU | |
| Descripción | BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVER | |
| Fabricantes | Silicon Laboratories | |
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Si4820/24-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 (Si4824 only)
(5.6–22 MHz)
No manual alignment necessary
Mono audio output
Selectable support AM/FM/SW
regional bands
Applications
Table and portable radios
Mini/micro systems
CD/DVD players
Boom boxes
Description
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
24-pin SSOP
RoHS-compliant
Direct volume control
Not EN55020 compliant*
*Note: For consumer applications that
require EN 55020 compliance,
use Si4831/35-B.
Modules
Clock radios
Mini HiFi
Entertainment systems
The Si4820/24-A10 is the entry level mechanical-tuned digital CMOS AM/FM/SW
radio receiver IC that integrates the complete receiver function from antenna input
to audio output. The Si4820/24-A10 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 Si4820/24-A10 is drop-in replaceable to
the existing Si4831/35 tuner, requires a simple application circuit, and removes
any requirements for manually tuning components during the manufacturing
process. It is a very simple product to design, manufacture, and support across
multiple product lines. 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 VDD1/2
LNA
AGC
0/90
AFC
REG
XTAL
OSC
Si4S8i438200//2344
ADC
DSP DAC AOUT
ADC
CONTROL INTERFACE
ADC
TUNE1/2
BAND
Ordering Information:
See page 14.
Pin Assignments
Si4820/24-A10 (SSOP)
LNA_EN
NC
TUNE1
TUNE2
BAND
NC
NC
FMI
RFGND
NC
NC
AMI
1
2
3
4
5
6
7
8
9
10
11
12
24 AOUT
23 NC
22 DBYP
21 VDD2
20 VDD1
19 XTALI
18 XTALO
17 VOL-
16 VOL+
15 RST
14 GND
13 GND
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 11/11
Copyright © 2011 by Silicon Laboratories
Si4820/24-A10
1 page  
Table 3. Reset Timing Characteristics
(VDD = 2.7 to 3.6 V, TA = 0 to 70 °C)
Parameter
RST Pulse Width
tSRST
Si4820/24-A10
Symbol
Min
Typ
Max
Unit
tSRST 100 — — µs
RST 70%
30%
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 VDD1/2
AFC
REG
XTAL
OSC
Si4820/24-A10
Si4S8i438200//2344
ADC
DSP DAC AOUT
ADC
CONTROL INTERFACE
ADC
TUNE1/2
BAND
Figure 2. Si4820/24-A10 Functional Block Diagram
4.1. Overview
The Si4820/24-A10 is the entry level mechanical-tuned
digital CMOS AM/FM/SW radio receiver IC that
integrates the complete receiver function from antenna
input to audio output. The Si4820/24-A10 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 Si4820/24-A10 is drop-in replaceable
to the existing Si4831/35 tuner, requires a simple
application circuit, and removes any requirements for
manually tuning components during the manufacturing
process. It is a very simple product to design,
manufacture, and support across multiple product lines.
Leveraging Silicon Laboratories' proven and patented
digital low intermediate frequency (low-IF) receiver
architecture, the Si4820/24-A10 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 Si4820/24-A10 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.
Rev. 1.0
11
11 Page | ||
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