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LA1235 View Datasheet(PDF) - SANYO -> Panasonic

Part Name
Description
Manufacturer
LA1235
SANYO
SANYO -> Panasonic SANYO
LA1235 Datasheet PDF : 12 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
LA1235
Description of external parts
Part
Function
No.
If decreased
Effect
If increased
R201 Input resistance (Rg) Causes matching wigh circuit of preceding stage.
R202 S meter adjust
Current drain increases.
S meter pointer is off zero point.
R203
(Observe max. rating).
(In case of voltage drive type).
R204
Muting sensitivity adjust
Muting sensitivity shifts to weak input
side.
R205 Hysterisis adjunt
Large hysteresis.
Muting drive circuit load Insufficient drive of detuning muting.
R206
Muting time constant
R207
Abnormal detuning muting
attenuation waveform and abnormal
sound at the time of low frequency
modulation.
R208
IF-off voltage applying
resistnace
Large flow-in current at pin 5
(Observe max. rating).
R209 AFC, detuning muting Large detuning muting bandwidth.
band width, tuning meter
R210 deflection adjust
R211 Detection coil damping Small detection output.
Small hysteresis.
When driveing muting of LA3390
(MPX), make less than 200kto
prevent malfunction.
Muting response delay.
IF-off does not occur.
(IF-off voltage7.5V).
Small detuning muting bandwidth.
Large detection output.
R212
S curve linearity
correction
Find such a value as to cause minimum distortion (THD).
C101 IF amplifier bypass
C102
C103
C104 S meter output bypass
C105 Muting drive output
C106 bypass
Muting drive output
C107 smooth
C108
C109 AF output LPF
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.
Muting response delay.
Muting response delay.
With MPX connected, separation
worsens.
C110 AFC output LPF
Muting attenuation worsens and
Detunig muting response delay.
detuning muting bandwidth narrows.
C111 Constant voltage circuit S/N, muting attenuation worsen.
C112 smooth
C113 Power supply bypass Unstable IF system.
L1 Power supply choke Unstable IF system.
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.
No.873-7/12
 

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