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參數資料
| 型號： | LA1784M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數： | 10/50頁 |
| 文件大小： | 568K |
| 代理商： | LA1784M |
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No. 6039-18/50
LA1784M
Pin No.
Function
Description
Equivalent circuit
59
60
63
O S C
64
1ST.IF
30
VCC
C1
C2
5 pF
RF AMP
620
620
VCC
A11749
+
3
6
+
–
FM.F.E
AGC
AM/FM
switching circuit
SD
VCC
510
100 k
3.3 V
GND
A11750
8 V
62
AM 1st
MIX
to RF
Amp.
10 k
2.1 V
A11751
10
10 k
5.6 V
20 pF
33 pF
X tal
to 2nd
MIX
A11752
Continued from preceding page.
Double balanced mixer
Pins 59 and 60 are the mixer
10.7-MHz output
59
Mixer output
Pins 63 and 64 are the mixer
60
input.
This is an emitter insertion type
circuit, and the amount of
63
Mixer input
insertion is determined by the
64
capacitors C1 and C2.
Note:The lines for pins 63 and 64
must be kept separated from
the lines for pins 59 and 60.
Pin 6 functions both as the FM
front end VCC and the AM/FM
switching circuit.
6
Front end VCC AM/FM
switching
1st MIX
First mixer input
62
INPUT
The input impedance is about
10 k
.
Crystal oscillator circuit
10
AM 2nd OSC
The Kinseki, Ltd. HC-49/U-S and
a CL of 20 pF must be used.
V6 voltage
Mode
When 8 V
→ FM
OPEN
→ AM
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