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SI4844 датащи(PDF) 11 Page - Silicon Laboratories

номер детали SI4844
подробное описание детали  Si4822/26/27/40/44 ANTENNA, SCHEMATIC, LAYOUT, AND DESIGN GUIDELINES
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
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SI4844 датащи(HTML) 11 Page - Silicon Laboratories

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AN602
Rev. 0.3
11
3.3. Si4822/26/40/44 Application Circuits: Slide Switch Select Band and MCU Re-define
Band Property
Figure 7 illustrates an Si4822/26/40/44 application circuit which uses a slide switch for band selection and enables
the host MCU to re-define the band property. For the band selection method using slide switch and resistors ladder,
refer to "2.2. Default Band Selection" on page 4. In this application, the user can select any default band and the
MCU will re-define the band’s property according to the design requirement. The MCU can only re-define the
selected band’s property, it cannot change an FM band to an AM or SW band, and vice versa. The two key points
to ensure the Si4822/26/40/44 works properly are as follows:
1. No pull-up resistor is connected to pin 1 LNA_EN.
2. Pin 5 BAND is connected to slide switch.
Figure 6. Si4822/26/40/44 Applications Circuit: Slide Switch Select Band and
MCU Re-define Band Property
FM1 (87MHz - 108MHz)
FM5 (64MHz - 87MHz)
AM1 (520kHz - 1710kHz)
Si4822/26/40/44
FM4 (76MHz - 90MHz)
SW1 (5.6MHz - 6.4MHz)
SW3(6.8MHz - 7.6MHz)
SW5(9.2MHz - 10.0MHz)
SW7(11.45MHz - 12.25MHz)
SW9 (13.4MHz - 14.2MHz)
SW11 (15MHz - 15.9MHz)
SW13 (17.1MHz - 18MHz)
SW15 (21.2MHz - 22MHz)
Si4826/44 only
Si4826/44 only
FM/SW
Optional
To host MCU
To host MCU
(For Si4822/26, pin23 is NC)
(For Si4822/26, pin24 is AOUT)
12
3
4
5
6
7
8
9
10
11
12
13
S2
R15
20k 1%
R10
20k 1%
R12
20k 1%
R11
20k 1%
R14
20k 1%
R9
20k 1%
R7
20k 1%
R8
50k 1%
R28
40k 1%
R29
120k 1%
L2
270nH
C19
0.1u
C15
4.7u
VR1
100k 10%
C6
0.1u
R6
100k
C5
0.47u
Q1
2SC9018
R31
1k
R32
10R
C30
33n
C33
10p
R41
120k
C31
33n
B6
2.5k/100M
C36
0.47u
R34
100k
C34
33p
C1
0.1u
R27
100R
R33
20k 1%
R35
20k 1%
R36
33k 1%
C13
47u
R43
30k 1%
R44
47k 1%
C4
4.7u
C7
4.7u
Y1
32.768KHz
C28
22p
C29
22p
R3
10k
ANT2
BAND [1]
LNA_EN
[1]
LNA_EN [1]
TUNE1
[1]
TUNE1 [1]
RESET
VCC
IRQ
SCLK
SDIO
LOUT
ROUT


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