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參數資料

LA3410

No.1407–7/13

(4) When C9 is decreased, the capture range will

widen but the stereo main distortion at f=10kHz

will worsen (beat distortion). This data is shown

in Fig. 4-E. Set C2 so that the stereo distortion

is kept rather low.

(5) The data on pilot level vs. capture range is

shown in Fig. 4-F to G. It is necessary to set the

loop filter constants, with the input pilot level

considered, so that the capture range becomes

wide. For example, when the LA1260 is used

for IF IC, the minimum demodulation output

will be 183mV (100% mod) and the stereo op-

eration must be performed at pilot level 12mV

with a pilot margin allowed. In this case,

C2=0.1

F, R1=6.8 to 10k are recommended.

5. Improvement in sub, stereo (R) distortions worsened at low frequencies.

There are some cases where the sub, stereo (R) distortions are worsened

at low frequencies. One cause for this worsening is the phase shift be-

tween 38kHz and 19kHz in the flip-flop inside the IC. This shift is im-

proved by connecting a phase compensating capacitor across pin 3 and

GND as shown in Fig. 5. The CD value differs with each IF (the phase

shift between the sub signal and pilot signal in the composite signal

differs with each IF). An adequate value is 200 to 1500pF.

相關PDF資料	PDF描述
LA3430M	FM, AUDIO DEMODULATOR, PDSO16
LA3430	FM, AUDIO DEMODULATOR, PZIP16
LA3433	FM, AUDIO DEMODULATOR, PDIP16
LA3460M	SPECIALTY CONSUMER CIRCUIT, PDSO24
LA3550M	SPECIALTY CONSUMER CIRCUIT, PDSO14

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LA3430	制造商:Panasonic Industrial Company 功能描述:IC
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