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參數(shù)資料
| 型號(hào)： | LA3430 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | PLL FM MPX Stereo Demodulator with Pilot Canceler for Car Stereo Use(用于汽車立體聲PLL FM MPX立體聲解調(diào)器(帶引導(dǎo)消除器)) |
| 中文描述： | 盈豐鎖相環(huán)調(diào)頻立體聲解調(diào)器（用于汽車立體聲盈豐鎖相環(huán)調(diào)頻立體聲解調(diào)器與試驗(yàn)的汽車音響用消器（帶引導(dǎo)消除器）） |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 299K |
| 代理商： | LA3430 |
LA3430
No.1408–5/12
Cautions when employing sample application circuits
· Adjust separation by 10k
potentiometer in low pass filter.
· Adjust R
S
for noise detection sensitivity under strong to medium radio fields. Set at adequate value.
· Adjust noise AGC by C
Y
and R
Y
to enhance noise suppression in medium to weak radio fields.
· Adjust pilot cancellation by 50k
potentiometer connected to pin 15 of LA2110.
· Reponse speeds of pilot cancellation to follow levels can be varied by adjusting capacitance value of 1
μ
F capacitor
connected across pins 11 and 12 of LA3430. Distortion factors deteriorate with reduction in value.
· Adjusting pilot cancellation.
For example consider the sample application circuit 2. Assume the input signal consists only of pilot signals. First
connect an oscilloscope and a valve voltmeter to pin 2 of LA2110. Set their ranges for V : 200mV/div. AC, H : 20
μ
s/
div.
Then, adjust pilot cancel control to minimize indications of valve voltmeter.
When the LA3430 alone is used (sample application circuit 1), adjust cancel control through a 19kHz B.P.F. to
minimize carrier leakage level at output pins (pins 5 and 6).
1. Pilot cancelling circuit
A level-following type has been used. Once set, it can easily accommodate varying pilot modulation depths among
stations. Cancelling signal is a sawtooth wave obtained by integrating a square wave that is proportionate in ampli-
tude to pilot level with C and R.
2. Separation adjustments
The LA3430 has separation parameters that have been set to provide maximum separation when used in conjunction
with the LA2110, a noise-canceler IC, or the equivalent. The LA3430 by itself exhibits separation only in a 25 to 30
dB range. If a phase correction circuit is provided in the LA3430 input circuit, it can exhibit intrinsic separation
charactersitics, typically 50 dB.
3. SNC (stereo noise control) and HCC (high-cut control)
The LA3430 has SNC and HCC terminals for improved S/N ratios when operating in weak radio fields. By adjusting
the SNC terminal, noises unique to stereo FM in weak fields can be reduced. The HCC terminals permits further
improvement of effective S/N ratios by lowering treble levels of FM noises in weak fields. (See Fig. 2)
STEREO deteriorates approximately 21.7 dB (compared to MONO) in weak radio feilds (Fig. 2). Generally, when
S/N ratios deteriorate below 30 to 40 dB, noises become quite noticeable. Section (1) shows ways to set SNC and
HCC when radio field strenghs are divided into 3 regions, A, B, and C, (Fig. 2). SNC is expected to function in
region A, and HCC in region B. In region C, shallow muting is effected in the IF stage.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA3430M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL FM MPX Stereo Demodulator with Pilot Canceler For Car Stereo Use |
| LA3430M-UDEL-AE | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA3433 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Car Stereo-Use PLL FM MPX Stereo Demodulator with Pilot Canceler |
| LA3440 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| LA3450 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL FM MPX Stereo Demodulator with Adjustment-Free VCO And Measure Against Channel Interference |
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