- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358728 > LA3370 (Sanyo Electric Co.,Ltd.) PLL FM Multiplex Stereo Demodulator for Car Stereo(用于汽車立體聲PLL FM多元立體聲解調(diào)器) PDF資料下載
參數(shù)資料
| 型號： | LA3370 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | PLL FM Multiplex Stereo Demodulator for Car Stereo(用于汽車立體聲PLL FM多元立體聲解調(diào)器) |
| 中文描述： | 鎖相環(huán)調(diào)頻立體聲多路解調(diào)器的汽車音響（用于汽車立體聲鎖相環(huán)調(diào)頻多元立體聲解調(diào)器） |
| 文件頁數(shù)： | 5/11頁 |
| 文件大小： | 389K |
| 代理商： | LA3370 |
LA3370
No.619-5/11
(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
(pin7) of the LA3370. Fig.7 shows MPX output frequency characteristics (monaural) provided by voltage impressed
on pin 7. Frequency characteristics for a 100% high cut can be determined by an external capacitor connected to pin
4. An equivalent circuit is shown below where the designation is made by the 5k
and the C time constant.
Approximate values provided by C as expressed in attenuation at 10kHz are listed in table below : right.
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 chracteristics.
Fig.2 shows typical meter outputs of a quadrature detection IF amplifier IC. (Fig. 1 shows data for LA1140) HCC
characteristics have been designated to permit region B improvements when the IC is directly connected to HCC
(pin 7) terminal of the LA3370. 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 via 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 LA3370 together with
the LA1140 further enhances S/N improvement.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LA3373 | Pilot Cancel-Provided PLL FM MPX Demodulator for Car Stereos |
| LA3375 | Pilot Cancel-Provided PLL FM MPX Demodulator for Car Stereos(用于汽車立體聲PLL FM MPX解調(diào)器) |
| LA3376 | Pilot Cancel-Provided PLL FM MPX Demodulator for Car Stereos(用于汽車立體聲PLL FM MPX解調(diào)器) |
| LA3380 | PLL FM |
| LA3386-MQ | TRANS PREBIASED NPN 150MW SOT523 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LA3370-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LA3373 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:PLL MULTIPLEX STEREO DEMODULATOR |
| LA3375 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Pilot Cancel-Provided PLL FM MPX Demodulator for Car Stereos |
| LA3376 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Pilot Cancel-Provided PLL FM MPX Demodulator for Car Stereos |
| LA3376M | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。