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Si4840/44-DEMO
Si4840/44 D EMO B OARD U SER ’ S G UIDE
1. Features
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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)
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Worldwide AM band support from 504 to 1750 kHz with 5 default sub-bands:
?? AM1
?? AM2
?? AM3
?? AM4
?? AM5
520–1710 kHz (Demo Board Default)
522–1620 kHz(Demo Board Default)
504–1665 kHz
520–1730 kHz
510–1750 kHz
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Worldwide SW band support from 2.3 MHz to 28.5 MHz with 16 default sub-bands:
?? SW1
?? SW2
?? SW3
?? SW4
?? SW5
?? SW6
?? SW7
?? SW8
?? SW9
?? SW10
?? SW11
?? SW12
?? SW13
?? SW14
?? SW15
?? SW16
5.6–6.4 MHz (Demo Board Default, for Si4844 only)
5.95–6.2 MHz
6.8–7.6 MHz (Demo Board Default, for Si4844 only)
7.1–7.6 MHz
9.2–10 MHz (Demo Board Default, for Si4844 only)
9.2–9.9 MHz
11.45–12.25 MHz (Demo Board Default, for Si4844 only)
11.6–12.2 MHz
13.4–14.2 MHz (Demo Board Default, for Si4844 only)
13.57–13.87 MHz
15–15.9 MHz (Demo Board Default, for Si4844 only)
15.1–15.8 MHz
17.1–18 MHz (Demo Board Default, for Si4844 only)
17.48–17.9 MHz
21.2–22 MHz (Demo Board Default, for Si4844 only)
21.45–21.85 MHz
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Twelve-position 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
FM stereo indication threshold 6 dB separation at 20 dBμv RF input (default) or 12 dB separation at 28 dBμv RF
input
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
2x4 matrix keypad
The frequency range of each band, the ST indication threshold, de-emphasis and AM channel space can be
reconfigured by host MCU.
Rev 0.1 8/11
Copyright ? 2011 by Silicon Laboratories
Si4840/44-DEMO
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