Si4820/24-DEMO
Si4820/24 D
EMO
B
OA RD
U
SER
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S
G
UIDE
1.
Features
ATAD
(analog tune and analog display) AM/FM/SW radio
Worldwide FM band support from 64–109 MHz with 5 sub-bands:
FM1
FM2
FM3
FM4
FM5
87–108 MHz (Demo Board Default)
86.5–109 MHz
87.3–108.25 MHz
76–90 MHz
64–87 MHz (Demo Board Default)
Worldwide
AM1
AM2
AM3
AM4
AM5
AM band support from 504–1750 kHz with 5 sub-bands
520–1710 kHz (Demo Board Default)
522–1620 kHz (Demo Board Default)
504–1665 kHz
520–1730 kHz
510–1750 kHz
Worldwide
SW1
SW band support from 5.6–22 MHz with 16 sub-bands:
5.6–6.4 MHz (DEMO Board Default, for Si4824 only)
SW2 5.95–6.2 MHz
SW3 6.8–7.6 MHz (DEMO Board Default, for Si4824 only)
SW4 7.1–7.6 MHz
SW5 9.2–10 MHz (DEMO Board Default, for Si4824 only)
SW6 9.2–9.9 MHz
SW7 11.45–12.25 MHz(DEMO Board Default, for Si4824 only)
SW8 11.6–12.2 MHz
SW9 13.4–14.2 MHz (DEMO Board Default, for Si4824 only)
SW10 13.57–13.87 MHz
SW11 15–15.9 MHz (DEMO Board Default, for Si4824 only)
SW12 15.1–15.8 MHz
SW13 17.1–18 MHz (DEMO Board Default, for Si4824 only)
SW14 17.48–17.9 MHz
SW15 21.2–22 MHz (DEMO Board Default, for Si4824 only)
SW16 21.45–21.85 MHz
Twelve
positions band switch for selecting different band according to the target market.
Two AAA battery operations with working voltage down to 2.0 V
Economical potentiometer for frequency tuning replaces more expensive variable capacitor (PVC).
Potentiometer and/or push button volume control
FM 50 µs or 75 µs (default) de-emphasis
2. Overview
This manual describes the operation of the Silicon Labs Si4820/24-DEMO board Rev1.0, Sep 02, 2011. The
Silicon Laboratories Si4820/24-DEMO board is designed with the 24-pin SSOP packaged Si4820/24 chip, the
revolutionary single chip AM/FM/SW receiver that integrates everything from antenna input to audio output and
allows use of common and economical potentiometers to do the frequency tuning. It provides a complete portable
analog tune analog display AM/FM/SW radio design. The Si4820/24-DEMO is designed with 1-layer PCB, allowing
the lowest cost without sacrificing the RF performance. The demo board works with two AAA batteries and working
voltage down to 2.0 V.
Rev. 0.1 10/11
Copyright © 2016 by Silicon Laboratories
Si4820/24-DEMO
Si4820/24-DEMO
3. Description
Figure 1 and Figure 2 shows the physical layout of the board with key components indicated.
Figure 1. Si4820/24-DEMO Board Top Side
Figure 2. Si4820/24-DEMO Board Bottom Side
2
Rev. 0.1
Si4820/24-DEMO
Power:
BAT1: 2 cells AAA battery holder
S1: Power on / off
Audio Connectors:
J5: Mono audio headphone output
Antenna Selections:
AM antenna: Ferrite stick antenna for AM
J1: BNC connector for FM/ SW conductive testing or FM whip antenna
J2: FM antenna selector
1
2
3
1-2: HP ANT (J5)
2-3: BNC (J1)
J6: SMA connector for AM conductive testing
J3: AM antenna selector
1
2
3
1-2: AM Ferrite Antenna
2-3: SMA for AM Conductive Test (J6)
Audio Output Test Point:
For the general specification test, TP3 is the recommended audio signal test point. The audio test instrument
should be connected to TP3 to get more accurate test results. J5 can also be used as an audio test point, but the
test results may not be entirely accurate under some circumstances.
1
2
GND
AOUT
Rev. 0.1
3
Si4820/24-DEMO
Main Components:
U1: Silicon Laboratories Si482x AM/FM/SW ATAD receiver
U2: Audio amplifier
Frequency scale: The analog display for tuning frequency
Control Interface:
VR1: Frequency tuning wheel.
VR2: Volume control wheel
S3,S4: The push buttons for volume control
S2: Band switch for FM, AM and SW
1
2
3
4
5
6
7
8
9
10
11
12
1: FM1 (87–108 MHz)
2: FM5 (64–87 MHz)
3: AM1 (520–1710 kHz)
4: AM2 (522–1620 kHz)
5:SW1 (5.6–6.4 MHz)
6:SW3 (6.8–7.6 MHz)
7:SW5 (9.2–10.0 MHz)
8:SW7 (11.45–12.25 MHz)
9:SW9 (13.4–14.2 MHz)
10:SW11 (15–15.9 MHz)
11:SW13 (17.1–18 MHz)
12:SW15 (21.2– 22 MHz)
4
Rev. 0.1
Si4820/24-DEMO
4. Operation
S4820/24-DEMO board, a complete analog tune and analog display radio, is very easy to operate:
1. Put two AAA batteries into the battery compartment.
2. Switch the power switch to the ON position. The board will power up to a radio band according to the
position of the band switch.
3. Change the band switch to the desired band.
4. Rotate the tuning wheel and find the desired frequency.
5. Rotate the volume control wheel or press the volume control push buttons to get a comfortable volume.
Note:
For FM listening, the earphone cable must be connected to the board when J2 is set to "HP ANT" or an external antenna
must be connected to the BNC connector when J2 is set to "BNC".
For AM listening, the ferrite antenna must be connected to the board and the J3 is set to "Ferrite" before Turning on the
radio or band switching to AM.
For FM/AM sensitivity and SNR test, the tuner output volume level must be set to maximum by pressing push button S4,
or you might get degraded test results.
Rev. 0.1
5
单片机
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