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參數資料
| 型號： | LA1780M |
| 元件分類： | 調諧器 |
| 英文描述： | 2-BAND, AUDIO TUNER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數： | 17/38頁 |
| 文件大小： | 764K |
| 代理商： | LA1780M |
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MRC circuit
If there is no AC noise on pin 32:
V27 will be about 2.5 V for an antenna input of 60 dB or higher.
Since the MRC noise amplifier gain is fixed, the MRC circuit is adjusted by reducing the AC input level.
The MRC circuit attack and release times are determined by the capacitor C27 on pin 27.
Attack: 7 A
× C27
Release: 500
× C27
5. FM Soft Muting
By comparing the pin 47 mute on adjustment voltage to the S-meter voltage (V24), the muting on point can be adjusted.
No. 5724-24/38
LA1780M
S-meter
FM
S-meter
To SNC
Pin 28
Noise amplifier
fc = The MPF + AMP 70 kHz
Required external transistor: 2SC536 or equivalent
Reason: Since the LA1780M MRC is a simplified
circuit, an OMRC level shifter is required.
V24 = V27 – VBE
↑
QMRC
Smaller R47
Larger R47
Larger
R47
Smaller R47
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LA1780MA-A-MPB-E | 制造商:ON Semiconductor 功能描述:ANALOG CAR RADIO TUNER - Trays 制造商:Rochester Electronics LLC 功能描述: 制造商:ON Semiconductor 功能描述:FTRAY - ANALOG CAR RADIO TUNER |
| LA1781M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Car Radios Single-Chip Tuner IC |
| LA1781M_09 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Car Radios Single-Chip Tuner IC |
| LA1781MA-MPB-E | 功能描述:調諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數: 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| LA1781MD-A-MPB-E | 制造商:ON Semiconductor 功能描述:ANALOG CAR RADIO TUNER - Trays |
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