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PDF Si4831 Data sheet ( Hoja de datos )
| Número de pieza | Si4831 | |
| Descripción | BROADCAST MECHANICAL TUNING AM/FM/SW RADIO RECEIVER | |
| Fabricantes | Silicon Laboratories | |
| Logotipo |  |
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Si4831/35-B30
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 (Si4835 only)
(5.6–22 MHz)
Excellent real-world performance
EN55020-compliant
No manual alignment necessary
Flexible band selections
Applications
Table and portable radios
Stereos
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
Supports station and stereo LED
indicators
Direct volume control
Bass and treble tone control
Modules
Clock radios
Mini HiFi
Entertainment systems
The Si4831/35-B30 is the 2nd generation mechanical-tuned digital CMOS
AM/FM/SW radio receiver IC that integrates the complete receiver function from
antenna input to audio output. Like other successful audio products from Silicon
Labs, Si4831/35-B30 offers unmatched integration and PCB space savings with
minimum external components and a small board area. The Si4831/35-B30
requires a simple application circuit and removes any requirements for manually
tuning components during the manufacturing process. The Si4831/35-B30 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/SW
ANT
AMI
RFGND
FMI
LNA
AGC
0/90
XTALI
2.0~3.6V VDD1/2
AFC
REG
XTAL
OSC
SSi4i4883301//3354
ADC DAC LOUT
DSP
ADC DAC ROUT
CONTROL
INTERFACE
ADC
TUNE 1/2
BAND
Ordering Information:
See page 13.
Pin Assignments
Si4831/35-B30 (SSOP)
STEREO
STATION
TUNE1
TUNE2
BAND
NC
NC
FMI
RFGND
NC
NC
AMI
1
2
3
4
5
6
7
8
9
10
11
12
24 LOUT
23 ROUT
22 DBYP
21 VDD2
20 VDD1
19 XTALI
18 XTALO
17 VOL-/BASS
16 VOL+/TREBLE
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 1/11
Copyright © 2011 by Silicon Laboratories
Si4831/35-B30
1 page  
Si4831/35-B30
Table 3. DC Characteristics
(VDD = 2.7 to 3.6 V, TA = –15 to 85 °C)
Parameter
Symbol Test Condition Min Typ Max
FM Mode
Supply Current1
Supply Current2
IFM
IFM Low SNR level
— 21.0 —
— 21.5 —
AM/SW Mode
Supply Current1
IAM
— 17.0 —
Supplies and Interface
VDD Powerdown Current
IDDPD
— 10 —
Notes:
1. Specifications are guaranteed by characterization.
2. LNA is automatically switched to higher current mode for optimum sensitivity in weak signal conditions.
Unit
mA
mA
mA
µA
Table 4. Reset Timing Characteristics
(VDD = 2.7 to 3.6 V, TA = –15 to 85 °C)
Parameter
RST Pulse Width and TUNE1, TUNE2 Setup to RST
TUNE1, TUNE2 Hold from RST
Symbol
Min
Typ
Max
Unit
tSRST 100 — — µs
tHRST 30 — — ns
tSRST
tHRST
RST 70%
30%
TUNE1 70%
30%
TUNE2 70%
30%
Figure 1. Reset Timing
Rev. 1.0
5
5 Page 
Si4831/35-B30
The stereo light up criteria is defined using both RSSI
and the Left and Right separation levels as these two
specifications are the primary factors for stereo
listening. The criteria can be set between two
conditions: the Left and Right channels are separated
by more than 6 dB with RSSI at >20 dB or Left and
Right channels are separated by more than 12 dB with
RSSI at >28 dB. The selection can be set up using
different values of the external resister. Refer to
"AN555: Si483x-B Antenna, Schematic, Layout, and
Design Guidelines."
4.3. AM Receiver
The highly integrated Si4831/35-B30 supports
worldwide AM band reception from 504 to 1750 kHz
with five sub-bands using a digital low-IF architecture
with a minimum number of external components and no
manual alignment required. This patented architecture
allows for high-precision filtering, offering excellent
selectivity and SNR with minimum variation across the
AM band. Similar to the FM receiver, the Si4831/35-B30
optimizes sensitivity and rejection of strong interferers,
allowing better reception of weak stations.
To offer maximum flexibility, the receiver supports a
wide range of ferrite loop sticks from 180–450 µH. An
air loop antenna is supported by using a transformer to
increase the effective inductance from the air loop.
Using a 1:5 turn ratio inductor, the inductance is
increased by 25 times and easily supports all typical AM
air loop antennas, which generally vary between 10 and
20 µH.
4.4. SW Receiver
The Si4835 supports 16 short wave (SW) band
receptions from 5.60 to 22.0 MHz. Si4835 supports
extensive short wave features such as minimal discrete
components and no factory adjustments. The Si4835
supports using the FM antenna to capture short wave
signals.
4.5. Frequency Tuning
A valid channel can be found by tuning the
potentiometer that is connected to the TUNE1 and
TUNE2 pin of the Si4831/35-B30 chip.
To offer easy tuning, the Si4831/35-B30 also supports a
station LED light. It will light up the LED if the RF signal
quality passes the LED sensitivity threshold when tuned
to a valid station.
4.6. Band Select
The Si4831/35-B30 supports worldwide AM band with
five sub-bands, US/Europe/Japan/China FM band with
five sub-bands, and SW band with 16 sub-bands. For
details on band selection, refer to "AN555: Si483x-B
Antenna, Schematic, Layout, and Design Guidelines."
4.7. Bass and Treble
The Si4831/35-B30 further supports bass and treble
tone control for superior sound quality. Pins 16 and 17
can be configured for tone control, allowing customers
to use either two buttons or one slide-switch to adjust
the bass and treble. For further configuration details,
refer to "AN555: Si483x-B Antenna, Schematic, Layout,
and Design Guidelines."
4.8. Volume Control
The Si4831/35-B30 not only allows customers to use
the traditional PVR wheel volume control through an
external speaker amplifier, it also supports direct digital
volume control through pins 16 and pin 17 by using
volume up and down buttons. Refer to "AN555: Si483x-
B Antenna, Schematic, Layout, and Design Guidelines."
Rev. 1.0
11
11 Page | ||
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