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參數(shù)資料
| 型號(hào)： | LA1235 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | FM IF System Applications |
| 中文描述： | 調(diào)頻中頻系統(tǒng)應(yīng)用 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大小： | 1031K |
| 代理商： | LA1235 |
LA1235
No.873-7/12
Description of external parts
Part
No.
R201 Input resistance (Rg)
R202
R203
Muting sensitivity adjust
R204
R205
S meter adjust
Hysterisis adjunt
Muting drive circuit load Insufficient drive of detuning muting.
Large hysteresis.
Small hysteresis.
When driveing muting of LA3390
(MPX), make less than 200k
to
prevent malfunction.
Muting response delay.
Current drain increases.
(Observe max. rating).
Muting sensitivity shifts to weak input
side.
R206
R207
Muting time constant
Abnormal detuning muting
attenuation waveform and abnormal
sound at the time of low frequency
modulation.
Large flow-in current at pin 5
(Observe max. rating).
Large detuning muting bandwidth.
R208
IF-off voltage applying
resistnace
AFC, detuning muting
band width, tuning meter
deflection adjust
R211 Detection coil damping
S curve linearity
correction
C101
C102
C103
C104 S meter output bypass
IF-off does not occur.
(IF-off voltage
≥
7.5V).
Small detuning muting bandwidth.
R209
R210
Small detection output.
R212
Find such a value as to cause minimum distortion (THD).
IF amplifier bypass
Unstable IF amplifier.
IF system may be unstable.
If low frequency AM compoent is
generated in IF signal, weak signal
muting flutters.
Abnormal detuning muting
attenuation waveform and abnormal
sound at the time of low frequency
modulation.
Unstable IF system.
C105
C106
Muting drive output
bypass
Muting response delay.
C107
C108
Muting drive output
smooth
Muting response delay.
C109
AF output LPF
With MPX connected, separation
worsens.
Detunig muting response delay.
C110
AFC output LPF
Muting attenuation worsens and
detuning muting bandwidth narrows.
S/N, muting attenuation worsen.
C111
C112
C113 Power supply bypass
L1
Power supply choke
Constant voltage circuit
smooth
Unstable IF system.
Unstable IF system.
Large detection output.
S meter pointer is off zero point.
(In case of voltage drive type).
Function
Effect
If decreased
Causes matching wigh circuit of preceding stage.
If increased
Proper cares in using IC
Connect the ground side of bypass capacitors of pins 2, 3 to an area close to pin 4.
Connect the ground side of bypass capacitors of pins 6, 7, 10, 13, 16 to an area close to pin 14.
Use the shortest possible wires for detection coil-to-pins 8, 9, 10 connection.
Pin 13, being used for signal meter drive output, can be also used multipath detection because IF signal envelope
detected is output at this pin.
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