SI4840-DEMO【PDF 1/22 页】SI4840 DEMO AND EVAL BOARD

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Si4840/44-DEMO

Si4840/44 D EMO B OARD U SER ’ S G UIDE

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 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

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

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

Si4840/44-DEMO

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