LA3401 데이터 시트보기 (PDF) - SANYO -> Panasonic
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LA3401 Datasheet PDF : 15 Pages
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LA3401
External Parts
Part No.
C1
C2
C3
C4, 5
C6
C7
C8
C9
C10
C11
C12
C13
C14, 15
R1, 2
R3, R4
R5, 6
R7
R8
R9
R10
R11
R12, 13
VR1
X
Discription
Remarks
DC cut
DC cut
Decreasing the value worsens separation at low frequencies.
DC cut
Decreasing the value worsens separation at low frequencies.
DC cut
Time constant for muting at changeover mode
Even when no FM/AM changeover muting is provided, a capacitor of 0.01µF or
greater is connected.
Synce detect filter
Power supply ripple filter
PLL loop filter
PLL loop filter
Improvement in low frequency stereo distortion
A capacitor value from 0.1 to 0.22µF is selected according to demodulation output
of FM IF. (Note 1)
Decreasing the value widens capature range ; increasing the value delays stereo
operation start timing after release of VCO stop.
(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.
DC cut
Time constant for muting at VCC-ON mode
De-emphasis constant
Output signal is muted for a certain time after application of power.
The values of C14, C15 are determined so that R1 · C15=R2 · C14=50µs (75µs) is
yielded.
Post amplifier feedback resistor de-emphasis constant
LPF input resistor
R1 · C15=R2 · C14=50µs (75µs)
3.3kΩ or greater (If less than this, the maximum output volatage cannot be
obtained.)
Wiring between pin 5 and R3 and between pin 8 and R4 must be made as short
as possible.
LPF output resistor
Limiting resistor
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).
Current flowing into pin 13 must not exceed 30mA.
Limiting resistor
Limiting resistor
Loop filter
Output DC voltage setting
The value of R9 is determined so that voltage applied to pin 15 becomes a value
from 3.5V to VCC–3V.
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.
A resistor value from 3.3 to 10kΩ is selected according to demodulation output of
FM IF (Note 1). Increasing the value widens capature range, but delays stereo
operation start timing after release of VCO stop (Note 2).
Post amplifier output DC voltage.
3.3 (1+R1/R12) or 3.3 (1+R2/R13), extension in output dynamic range.
Separation adjust
Separation is adjusted by changing (L+R) signal level with VR1.
Free-running frequency setting
CSB456F11 (Murata), KBR-457HS (Kyocera)
Note 1 : For C9, R11 setting, refer to Sample Application Circuit (Note 2) and Note 2 for Using IC.
Note 2 : To advance stereo operation start timing, the value of C10 is decreased. Decreasing the value of C10 narrows
capature range. This narrowing also depends on the value of C9. It is recommended to use C10 of 0.47µF or
greater.
Pin Voltage, Name Remarks
Part No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Voltage [V]
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
3.3
–
–
0
–
0 or 4.9
–
Pin Name
AM input
FM input
Composite amplifier output
Separation adjust
Post amplifier output
Post amplifier input
Post amplifier input
Post amplifier output
VCC–ON muting
FM/AM changeover
Muting output
GND
Stereo indicator
Changeover mute
Muting
Input resistor 20kΩ
Input resistor 20kΩ
Output resistor 1kΩ
L output
Minus input
Minus input
R output
Input resistor 80kΩ
Remarks
Open collector
Gnd through a capacitor of 0.01µF or greater
Input resistor 80kΩ
Continued on next page.
No.1868–5/15
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