Si4844-B-DEMO
Si4844-B D
EMO
B
OARD
U
SER
’
S
G
U I D E
1.
Features
ATDD
(analog tune and digital display) FM/AM/SW radio
Worldwide FM band support from 64 to 109 MHz with 5 default 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 kHz to 1750 kHz with 5 default 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 2.3 to 22 MHz with 16 default sub-bands:
5.6–6.4 MHz (DEMO Board Default)
SW2 5.95–6.2 MHz
SW3 6.8–7.6 MHz (DEMO Board Default)
SW4 7.1–7.6 MHz
SW5 9.2 –10 MHz (DEMO Board Default)
SW6 9.2–9.9 MHz
SW7 11.45 –12.25 MHz (DEMO Board Default)
SW8 11.6–12.2 MHz
SW9 13.4–14.2 MHz (DEMO Board Default)
SW10 13.57 - 13.87 MHz
SW11 15–15.9 MHz (DEMO Board Default)
SW12 15.1–15.8 MHz
SW13 17.1–18 MHz (DEMO Board Default)
SW14 17.48–17.9 MHz
SW15 21.2–22 MHz (DEMO Board Default)
SW16 21.45–21.85 MHz
Supports
wider FM/SW band range
Twelve positions slide switch or one push button for selecting different bands according to the target
application
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
9-level Bass/Treble via push button control for FM
7-level Bass/Treble via push button control for AM/ SW
FM/AM/SW band indicator and frequency display in LCD
2×4 matrix keypad
The frequency range of each band, de-emphasis, and AM channel space can be re-configured by host
MCU.
Rev. 0.1 5/13
Copyright © 2016 by Silicon Laboratories
Si4844-B-DEMO
Si4844-B-DEMO
2. Overview
This manual describes the operation of the Silicon Labs Si4844 DEMO board Rev1.4, Mar 12, 2013. The Silicon
Laboratories Si4844-DEMO board is designed with the 24-pin SSOP packaged Si4844-B 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
digital display AM/FM/SW radio design. The LCD displays the tuning information. The Si4844-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.
3. Description
Figure 1 and Figure 2 shows the physical layout of the board with key components indicated.
Figure 1. Si4844-DEMO Board Top Side in Time Mode
2
Rev. 0.1
Si4844-B-DEMO
Figure 2. Si4844-DEMO Board Bottom Side
Rev. 0.1
3
Si4844-B-DEMO
Power:
BAT1: 2 cells AAA battery holder
Audio Connectors:
J5: Stereo audio headphone output
Antenna Selections:
AM antenna: Ferrite stick antenna for AM
J6: SMA connector for AM conductive test
S11: AM antenna selector
1-2: SMA for AM Conductive Test (J6)
2-3: AM Ferrite Antenna
1
2
3
J1: BNC connector for FM/ SW conductive test or FM whip antenna
S12: FM antenna selector
1
2
3
1-2: FM HP ANT (J5)
2-3: FM BNC (J1)
Radio Band Selection:
The demo board provides two methods for selecting the radio band: one is to use the slide switch, S2; the other is
to use the POWER/BAND push button. S14 determines which method is in use.
S14:
3
2
1
2-3: Use slide switch to select band
1-2: Use push button to select band
4
Rev. 0.1
Si4844-B-DEMO
Radio Band Property Setting
S13:
1
2
3
Audio Output Test Point:
For 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.
TP3:
2-3: Use the keypad to set the band property via MCU
1-2: Use the tuner default band setting values
1
2
3
Lout
Rout
GND
Tuner Output Test Point:
For the tuner specification test, TP1 is the recommended tuner output test point. The audio test instrument should
be connected to TP1 to get accurate test results.
TP1:
1
2
3
Main Components:
U1: Silicon Laboratories Si4844-B FM/AM/SW ATDD receiver
U2: Audio amplifier
U3: MCU
LCD: The digital display for tuning information
Lout
GND
Rout
Rev. 0.1
5
Microchip MCU
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