LA3410 Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA3410

VCO Non-Adjusting PLL FM MPX Stereo Demodulator with FM Accessories

SANYO -> Panasonic 

LA3410

(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=0.1µF, R1=6.8 to 10kΩ 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.

No.1407–7/13

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