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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)： | 12/15頁 |
| 文件大?。?/td> | 467K |
| 代理商： | LA3401 |
LA3401
No.1868-6/17
(Cu-foiled area) 110
×75mm2
+
6800pF
22
1
12
11
+
120k
Ω
LA3401
R OUTPUT
3.3k
Ω
1000pF
40mH
FM/AM
R4
3.3k
Ω
40mH
L OUTPUT
6800pF
3.3k
Ω
1000pF
6800pF
C5
10
μF
510pF
C14
R13 R3 3.3k
Ω
R12
120k
Ω
10
μF
10
μF
10
μF
10
μF
10
μF
0.22
μF
1
μF
1
μF
1
μF
100
μF
C4
510
pF
C15
100k
Ω
100k
Ω
R2
R1
350k
Ω
C3
FM INPUT
AM INPUT
C2
C1
C11
C13
C12
VCC
X
3.3k
Ω
C8
R11
C10
+
C9
+
C7
C6
VCO
STOP
MUTE
R8
1k
Ω
+
VR1
LED
Sample Printed Circuit Pattern
External Parts
Part No.
Description
Remarks
C1
DC cut
C2
DC cut
Decreasing the value worsens separation at low frequencies.
C3
DC cut
Decreasing the value worsens separation at low frequencies.
C4, 5
DC cut
C6
Time constant for muting at changeover mode
Even when no FM/AM changeover muting is provided, a capacitor of 0.01
μF or
greater is connected.
C7
Synce detect filter
C8
Power supply ripple filter
C9
PLL loop filter
A capacitor value from 0.1 to 0.22
μF is selected according to demodulation
output of FM IF. (Note 1)
C10
PLL loop filter
Decreasing the value widens capture range ; increasing the value delays
stereo operation start timing after release of VCO stop.
C11
Improvement in low frequency stereo distortion
(L-R) signal and decoder 38kHz switching signal are phased with each other by
a capacitor of 100 to 1000pF (differs with each audio set) connected.
C12
DC cut
C13
Time constant for muting at VCC-ON mode
Output signal is muted for a certain time after application of power.
C14, 15
De-emphasis constant
The values of C14, C15 are determined so that R1C15 = R2C14 = 50
μs (75μs)
is yielded.
R1, 2
Post amplifier feedback resistor de-emphasis constant
R1
× C15 = R2 × C 14 = 50μs (75μs)
R3, 4
LPF input resistor
3.3k
Ω or greater (If less than this, the maximum output voltage cannot be
obtained.)
Wiring between pin 5 and R3 and between pin 8 and R4 must be made as short
as possible.
R5, 6
LPF output resistor
R7
Limiting resistor
The value of R7 is determined so that voltage applied to pin 10 becomes a
value from 4.3V to VCC-2V (not exceeding 10V).
R8
Limiting resistor
Current flowing into pin 13 must not exceed 30mA.
R9
Limiting resistor
The value of R9 is determined so that voltage applied to pin 15 becomes a
value from 3.5V to VCC-3V.
R10
Limiting resistor
The value of R10 is determined so that voltage applied to pin 17 becomes a
value from 5V to VCC-2V.
For how to obtain R10, refer to VCO stop application mentioned later.
R11
Loop filter
A resistor value from 3.3 to 10k
Ω is selected according to demodulation output
of FM IF (Note 1). Increasing the value widens capture range, but delays stereo
operation start timing after release of VCO stop (Note 2).
R12, 13
Output DC voltage setting
Post amplifier output DC voltage.
3.3 (1+R1/R12) or 3.3 (1+R2/R13), extension in output dynamic range.
VR1
Separation adjust
Separation is adjusted by changing (L+R) signal level with VR1.
X
Free-running frequency setting
CSB456F11 (Murata), KBR-457HS (Kyocera)
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