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參數(shù)資料
| 型號： | LA3401 |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PDIP22 |
| 封裝： | SDIP-22 |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 467K |
| 代理商： | LA3401 |
LA3401
No.1868-13/17
Decoder circuit (Refer to the Block Diagram in the Sample Application Circuit.)
The LA3401 adopts a decoder circuit of chopper type. The sub signal sync detected by this decoder is applied to the
post amplifier minus input through Rb as shown in the Sample Application Circuit. This signal is matrixed with the
main signal coming out of amplifier A5 and passing through RC.
The gain for the sub signal is :
R1
2
R2
2
VS
Rb
π
or VS
Rb
π
The gain for the main signal is :
VR1
R1
VR1
R2
VM
Ra+VR1
Rc
or VM
Ra+VR1
Rc
R1, R2 : Post amplifier feedback resistor
VS :
Peak value of input sub signal
VR1 :
Semifixed resistor for separation adjust
VM :
Peak value of input main signal
In the LA3401, the gain of the main signal is varied with VR1 to adjust the separation. Since the IF output is generally
such that the sub signal level is lower than the main signal level, the separation can be adjusted by attenuating the main
signal level with VR1. The use of an ant ibirdie filter across the IF output and the FM input of the LA3401 may cause
the sub signal level to be raised, and when the sub signal level is higher than the main signal level the separation cannot
be adjusted with VR1. In this case, the sub signal level is attenuated to be less than the main signal level and applied to
the LA3401 and the separation is adjusted with VR1.
16
75
76
82
Muting Attenuation -- VCC
Supply Voltage, VCC -- V
Muting
Attenuation
--
dB
JK340125
468
10
12
14
77
78
79
80
81
VIN = 400mV (AM, FM input)
No external muting
f = 1kHz
Fig. 19
16
69
70
76
Cross Talk -- VCC
Supply Voltage, VCC -- V
Crosstalk
-
-dB
JK340124
468
10
12
14
71
72
73
74
75
AM
FM
AM
Fig. 18
SG1
SG2
5.1k
Ω
5.1k
Ω
10
μF
10
μF
LA3401
2
1
f = 1kHz
VIN = 400mV
Pin 10 voltage 5V
5.1k
Ω termination
connected to SG
output (See left.)
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