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| 型號(hào)： | LA3430 |
| 元件分類： | 接收器 |
| 英文描述： | FM, AUDIO DEMODULATOR, PZIP16 |
| 封裝： | 3 MM PITCH, SIP-16 |
| 文件頁(yè)數(shù)： | 12/13頁(yè) |
| 文件大?。?/td> | 336K |
| 代理商： | LA3430 |
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LA3430
No. 1408-8/13
(3) HCC (high-cut control)
In region B where S/N deteriorates to 40dB or worse even for monaural, the S/N as sensed by the human ear can
be enhanced by suppressing levels at frequencies above approximately 7kHz.
Treble region levels that follow meter voltages can be smoothly attenuated (high-cut control) by impressing IF
stage signal meter output to the HCC pin (pin 7) of the LA3430. Fig. 7 shows MPX output frequency
characteristics (monaural) provided by voltages impressed on pin 7. Frequency characteristics for a 100% high
cut can be designated by an external capacitor connected to pin 4. An equivalent circuit is shown below where
the designation is made by the 5k
Ω and the C time constant. Approximate values provided by C as expressed in
attenuation at 10kHz are listed in table below : right.
C [
μF]
Attenuation at 10kHz (dB)
0.01
11
0.033
21
0.047
25
0.068
28
Fig. 8 shows the relation between voltages impressed on pin 7 and rates (%) of high cut (HCC). When IF meter
output voltage characteristics and region B, S/N characteristics, of Fig. 2 have been obtained, S/N improvement
by HCC can be drawn in a way similar to drawing SNC characteristics.
Fig. 2 shows typical meter outputs of a quadrature detection IF amplifier IC. (Fig. 1 shows data for the LA1140,
LA1230, and LA1231N) HCC characteristics have been designated to permit region B improvements when the
IC is directly connected to HCC (pin 7) terminal of the LA3430. The infinitesimal control currents at pin 7,
similar to pin 8, do not affect meter outputs.
(4) SNC and HCC connection circuits when coupled with the IF stage
Fig. 1 shows sample S/N characteristics vs. antenna inputs when SNC and HCC are connected with the IF stage
by an external circuit.
(5) S/N improvements in region C of Fig. 1
Because S/N ratios deteriorate even further in the region C of Fig. 1, it is better to improve the S/N in this region
with IF mutings. The LA1140 is available to linearly vary the IF muting. Employment of the LA3430 together
with the LA1140 further enhances S/N improvement.
(6) Using the HCC terminal for muting
Mutings in the neighborhood of 37dB are feasible by utilizing HCC functions as muting functions when used in
home stereos and no need exists to suppress treble noises. Fade-in and fade-out of mutings, permitting delightful,
shock-noise-free muting, are possible by providing a time constant to the pin 7 control.
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相關(guān)代理商/技術(shù)參數(shù) |
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| 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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