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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)： | 15/15頁 |
| 文件大?。?/td> | 467K |
| 代理商： | LA3401 |
LA3401
No.1868-11/17
24
0
4.0
Pin 9 to GND Capacitance --
μF
Mute
T
ime
-
-s
JK340118
0
4
8
12
16
20
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Mute Time -- Pin 9 to GND Capacitance
10
μF
10
μF
LA3401
C13
6(8)
VCC
GND
ON
3.3V
Mute time
+
Fig.12
Muting in the VCC-ON mode
1. Muting time
Muting is turned ON for a certain period of time fixed
by external capacitor C13. Fig. 12 shows the relation
between the muting time and C13.
2. Values of AM/FM input coupling capacitors (C1, C2) and value of C13
If muting is released before the DC voltage on the AM input (pin 1) or FM input (pin 2) is stabilized after VCC is turned
ON, pop noise is generated. Therefore, the value of C13 must be determined by the input coupling capacitor value. The
adequate value of C13 for C1, C2 of 10
μF is 10μF or thereabouts. If the value of C1, C2 is increased, the value of C13
is also increased accordingly.
Feedback resistance of post amplifier and total gain, de-emphasis constant values
Table 1 shows the feedback resistance of post amplifier and total gain, de-emphasis
Table 1. Feedback resistance of post amplifier and total gain, de-emphasis
R1 (R2)
Total
C13 (C14) 50
μs
C13 (C14) 75
μs
33k
Ω
3.0dB
1500pF
2200pF
39k
Ω
4.5dB
1200pF
2000pF
51k
Ω
6.5dB
1000pF
1500pF
62k
Ω
8.5dB
750pF
1200pF
82k
Ω
11.0dB
620pF
910pF
100k
Ω
13.0dB
510 pF
750pF
130k
Ω
15.0dB
390pF
560pF
150k
Ω
16.0dB
330pF
510pF
180k
Ω
17.5dB
270pF
390pF
Total gain : Value in monaural mode
R1 C15 = R2 C14 = 50
μs, 75μs
How to extend the dynamic range of the post amplifier
In the Sample Application Circuit of the LA3401 the dynamic range of the post amplifier is extended by connecting
resistors R12, R13 across the virtual GND points (pins 6, 7) of the post amplifier and GND as shown in Fig. 13 to set the
output (pins 5, 8) DC voltages to an adequate value.
The DC voltages on pins 5, 8 are obtained as follows :
3.3
RB + R1
RB
= 3.3
1 +
R1
RB
3.3
RB + R2
RB
= 3.3
1 +
R2
RB
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