Low-power stereo radio circuit
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SP3767HN
、:
SP3767HN ,, ,。SP3767HN 、 FM 。: • ( ) • /(87.5 to 108 MHz)(76 to 91MHz)...
Description
Downloads http://www.basicavr.com
SP3767HN
、:
SP3767HN ,, ,。SP3767HN 、 FM 。: ( ) /(87.5 to 108 MHz)(76 to 91MHz) 108 MHz (AGC) LC , 32.768K、13M、 6.5M I2C 7,4 ,(SNC), (HCC) ,(SNC), (HCC) , ,, ( VCCA, VCC(VCO) VCCD = 5 V).
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-1-
SP3767HN
、:
1 2
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1 2
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
1 2 1 2 AGC
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
-2-
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47nF 47nF Vref 26 25 24 23 22 MPXO TMUTE VAFR VAFL 29 LIMDEC1 28 TIFC 27 47nF LIMDEC2
33nF
33nF
R1 GAIN STABILIZATION POWER SUPPLY
Igain
32
AGND
33
、:
VCCA
RESONANCE AMPLIFIER LIMITER MUTE SDS DEMODULATOR SOFT
4.7
22nF
+
22uF
34
VCCA
19
PILFIL 33K
1nF 22nF
I/Q-MIXER 1st FM LEVEL ADC IF COUNTER
FM antenna
MPX DECODER
100pF IF CENTRE FREQUENCY
2 N1
ADJUST Iref
18 PHASEFIL 17 CRYSTAL OSCILLATOR 16 Cpull(1) XTAL1 XTAL2
22nF Ccomp(1)
L1
27pF
RFI1 RFGND
35 36
47pF
AGC
RFI2
37
SP3767HN
32.768KHz
TAGC
38
or
13MHz SWPORT2 15 14 SWPORT1 10K 10K
4.7nF
programmable divider output TUNING SYSTEM reference frequency divider output
pilot
LOOPSW
39
MUX
SOFTWARE PROGRAMMABLE PORT
VCCA
13 BUSENABLE
mono 12 11 BUSMODE WRITE/READ
VCO
I2C-BUS AND 3-WIRE BUS
2 CPOUT 39nF VCOTANK1 VCOTANK2
3
4
5
6 DGND
7
8 DATA
9 CLOCK
1 10 20 21 30 31 40
VCC(VCO)
VCCD
12 22nF
n.c.
10nF
VCCD
10K D1 100K L3 L2 D2
47
22nF
VCC(VCO)
SP37...
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