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參數(shù)資料
| 型號： | LA3410 |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PDIP16 |
| 封裝： | DIP-16 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 449K |
| 代理商： | LA3410 |
LA3410
No.1407–9/13
Decoder circuit (Refer to the Block Diagram in the Sample Application Circuit.)
The LA3410 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 A3. The demodulation method is, in a sense, a combination of switching method and matrix
method. The gain for the sub signal is :
R1, R2 : Post amplifier feedback resistor
VS :
Peak value of input sub signal
The gain for the main signal is :
VR1 :
Semifixed resistor for separation adjust
VM :
Peak value of input main signal
In the LA3410, the gain of the main signal is varied with VR1 to adjust the separation. The IF output is generally such
that the sub signal level is lower than the main signal level. In this case also, the separation can be adjusted.
3. De-emphasis
The de-emphasis characteristic depends on the feedback resistors, capacitors of the post amplifier. R1, R2, C3, C4 in
the Sample Application Circuit are set as R1C3=R2C4=50
s, 75s. Table 3 shows the values of R1, R2, C3, C4 and the
de-emphasis constants.
Table 3
The post amplifier requires feedback capacitors C3, C4 regardless of the de-emphasis characteristic. Without these
capacitors, the stereo distortion gets worse.
4. Low-pass filter
Fig. 8 shows a sample circuit configuration where an LC filter is used as the low-pass filter and Fig. 16 shows a sample
characteristic of this filter. As compared with the LPF (BL-13) in the Sample Application Circuit, the use of this filter
makes the attenuation less at 19kHz, 38kHz ; therefore, carrier leak at the LPF output causes the stereo distortion and
separation characteristic to get worse than specified in the Operating Characteristics. For the stereo distortion, the BL-
13 provides approximately 0.02%, while the LC filter provides approximately 0.5%
VS
or
VS
R1
RB
2
π
R2
RB
2
π
VM
or
VM
VR1
RA+VR1
R1
RC
VR1
RA+VR1
R2
RC
)
2
R
(
1
Rs
0
5
)
4
C
(
2
Cs
5
7
)
4
C
(
2
C
k
3
F
p
0
5
1F
p
0
2
k
9
3
F
p
0
2
1F
p
0
2
k
1
5
F
p
0
1F
p
0
5
1
k
2
6
F
p
0
5
7F
p
0
1
k
2
8
F
p
0
2
6F
p
0
1
9
k
0
1
F
p
0
7
4F
p
0
8
6
k
0
3
1
F
p
0
9
3F
p
0
6
5
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