AN555 Ver la hoja de datos (PDF) - Silicon Laboratories
Número de pieza
componentes Descripción
Fabricante
AN555 Datasheet PDF : 38 Pages
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AN555
ANT2
FM/SW
C36
0.47u
C31
33n
LNA_EN [1]
B6
2.5k/100M
R41
120k
C30
33n
R34
100k
VCC
R32
10R
R31
1k
C33
10p
Q1
2SC9018
For Si4824 only
VCC
VCC
C5
0.47u
C13 C1
VR1
50k 10%
47u 0.1u
R27
100R
C34
33p
L2
270nH
[1] TUNE1
[1] LNA_EN
C19
0.1u
R6
100k
U1
Si482x-A
C4
4.7u
C6 C15
0.1u 4u7
Y1
32.768KHz
C2
C3
22p
22p
AOUT
R37
R38
56k
56k
optional
BAND [1]
TUNE1 [1]
S2
1
2
3
4
5
6
7
8
9
10
11
12
13
R36
33k 1%
R43
30k 1%
R35
20k 1%
SW8 (21.2MHz - 22MHz)
R15
20k 1%
R10
20k 1%
SW7 (17.1MHz - 18MHz)
SW6 (15MHz - 15.9MHz)
SW5 (13.4MHz - 14.2MHz)
R12
20k 1%
R11
20k 1%
SW4(11.45MHz - 12.25MHz)
R14
20k 1%
R9
20k 1%
SW3(9.2MHz - 10.0MHz)
SW2(6.8MHz - 7.6MHz)
R8
50k 1%
R7
20k 1%
SW1 (5.6MHz - 6.4MHz)
AM1 (520kHz - 1710kHz)
R28
40k 1%
FM3 (64MHz - 87MHz)
R29
120k 1%
FM2 (76MHz - 90MHz)
FM1 (87MHz - 108MHz)
R33
20k 1%
R44
47k 1%
Figure 10. Si4820/24 Applications Circuit with 32-Level Volume Control
At the device power up, Si483x-B/Si4820/24 will put the output volume at some default levels according to the push
button configurations as shown in Figure 11. There are four default volume level choices. Adding pull-down
resistors to both pin 16 and 17 sets the default volume to maximum, typically 80 mVrms for FM and 60 mVrms for
AM. Different pin 16 and 17 pull-up/down resistor combinations can set the default volume to either Max, Max-6dB,
Max-12dB or Max-18dB. For example, in Figure 9, two pull-up resistors are connected to pin 16 and pin 17, which
sets the default volume to Max-18dB.
16
Rev. 0.2
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