参数资料
型号: LA1781M
元件分类: 接收器
英文描述: AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64
封装: 14 X 14 MM, QIP-64
文件页数: 11/48页
文件大小: 508K
代理商: LA1781M
LA1781M
No.6038-19/48
AC Characteristics Test Circuit
1
2
3
4
5
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7
8
9
10
11
12
13
14
15
16
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
17
18
19
20
21
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23
24
25
26
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31
32
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
ANT
D
BUFF
AM
1ST
OSC
AGC
TRIG
GATE
HPF
FF
19
<
90
k
LPF
SNC
MRC
FF
19
<
0
FF
38k
<
0
FF
PHASE
COMP
VCO
TRIG
PILOT
DET
P-CAN
SUB
DEC
MA
TRIX
VCO
STOP
MAIN
HC
HCC
ANT
D
HOLE
DET
MUTE
DRIVE
AMVSM
AM
SD
IF
BUFF
FMVSM
FM
SD
IF
limiter
amplifier
DET
IF
AGC
BUFF
L.C.
OSC
BUFF
OSC
DC-C
DET
AFC
CIAMP
Q.DET
MUTE
AMP
MIX
AM/FM
MIX
RF
AGC
W.B.
AGC
TWEET
BUFF
AM
FM
VREF
KEYED
AGC
FF
REG
FM/AM
SW
W.B.AGC
RF
AGC
+
--
+
ANTD
RFAGC
FEGND
OSC
20k
Ω
SW1
VA1
VA9
8V
V
CC
VA6
10k
Ω
20pF
300pF
6800pF
0.01
μ
F
10
μ
F
0.015
μF
0.015
μF
0.01
μ
F
0.22
μ
F
0.47
μ
F
F
BA
SW4(T)
F
AM
HC
AM
LEVEL
1
μF
F
20k
Ω
3pF
100k
Ω
VR1
VR2
8V
SW9
5.6k
Ω
8200pF
0.047
μ
F
0.022
μ
F
10.26MHz
X
TAL
5pF
1
μF
0.022
μF
0.022
μF
0.01
μF
0.47
μF
1M
Ω
50k
Ω
50k
Ω
VD2
VA3
FM/AM
IFBUFF.
VD4
SW5
4.3k
Ω
100k
Ω
100k
Ω
+
AM
OSC
MPX
OUT
PI.CAN
ADJ
SEP.ADJ
CSB912JF104
AM/FM
S-METER
GND
SNC
HCC
NC-IN
DET
OUT
FM
S-METER
N.C.MPXGND
MUTE
DRIVE
0.1
μF
0.47
μF
0.22
μF
0.022
μF
2.2
μF
3.3
μF
1
μF
15k
Ω
IF7
100
μF
2200pF
AFCIN
QDOUT
QDIN
VREF
FMSD
ADJ.
AMLC
CHCC
PILOTDET
MUTEOR
ADJ
KEYEDAGC
10k
Ω
10k
Ω
22k
Ω
240k
Ω
6.8k
Ω
0.1
μ
F
RFAGC
IF
OUT
B
A
IF
IN
SW3
SW2(i)
MIX
GND
V
CC
0.022
μ
F
0.022
μF
100
μ
H
47
μF
20k
Ω
0.022
μF
0.022
μF
100
μ
H
0.022
μ
F
30
Ω
100k
Ω
620
Ω
510
Ω
1k
Ω
30
Ω
25
Ω
50
Ω
300k
Ω
0.022
μ
F
10pF
330
Ω
FC18
ANTD
VD6
SW8
SW7
1MH
6.8MH
FM
IF
IN
FM
IF
OUT
AM
IF
IN
FE
IF
IN
330
Ω
200
Ω
300
Ω
0.022
μ
F
AM
MIX
OUT
FM
WB
AGCIN
AM
SD
ADJ
MUTE
ATT
FEV
CC
V
CC
V
CC
5pF
3pF
39pF
100k
Ω
50
Ω
10k
Ω
1M
Ω
100
Ω
100
Ω
GND
VT
0.022
μ
F
0.022
μ
F
1000
μ
F
0.022
μ
F
15pF
JIS
DUMMY
30
Ω
50
Ω
65pF
30k
Ω
RIGHTCH.
LEFTCH.
AM/FMOSC
BUFF
VA2
FMGND
FMV
CC
SEEK
AM/FM
SD
STOP
AM
ST
BUFFER
FM
ST
IND.
ADJ
VD1
200k
Ω
30k
Ω
V
CC
2
VD3
V
CC
2
VD5
MRC-IN
V
CC
8V
V
CC
3
HCC
NC-IN
SNC
PG1
(AC1)
+
V
CC
1
5V
100k
Ω
SW6
+
AC5
+
AC1
SG1
300
Ω
50
Ω
50
Ω
+
AC3
SG3
+
AC2
SG2
3pF
0.022
μ
F
10k
Ω
10k
Ω
V
CC
VA7
8V
SW10
10
μ
F
+
10k
Ω
1M
Ω
VA8
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