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參數(shù)資料
| 型號： | LA1780M |
| 元件分類： | 調(diào)諧器 |
| 英文描述： | 2-BAND, AUDIO TUNER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數(shù)： | 5/38頁 |
| 文件大小： | 764K |
| 代理商： | LA1780M |
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No. 5724-13/38
LA1780M
Pin No.
Function
Description
Equivalent circuit
SD circuit
FM
detector
output
AM
detector
Noise
canceller
MRC input
Band
muting
Continued from preceding page.
Continued on next page.
30
Noise canceller input
Pin 30 is the noise canceller input.
The input impedance is 50 k
.
Pin 31 is the AM and FM detector
output
In FM mode, this is a low-
impedance output.
31
AM/FM detector output
In AM mode, the output
impedance is 10 k
.
To improve the low band
separation, use a coupling
capacitor of over 10 F.
FM S-meter output block
32
IF S-meter output and MRC
MRC AC input block
DC input
Adjust the external 1-k
resistor
to attenuate the MRC AC input
and control the circuit.
The muting time constant is
determined by an external RC
circuit as described below.
Attack time: TA = 10 k × C1
Release time: TR = 50 k × C1
Noise convergence adjustment
33
Mute drive output
The noise convergence can be
adjusted when there is no input
signal by inserting a resistor
between pin 33 and ground.
Muting off function
Ground pin 33 through a 4-k
resistor.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)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(diào)諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 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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