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| 型號(hào)： | LA1781M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Single-Chip Tuner IC for Car Radios |
| 中文描述： | 單芯片調(diào)諧器IC的汽車收音機(jī) |
| 文件頁(yè)數(shù)： | 12/50頁(yè) |
| 文件大?。?/td> | 567K |
| 代理商： | LA1781M |
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No. 6038-12/50
LA1781M
Pin No.
Function
Description
Equivalent circuit
31
30
+
AM
detector
FM
detector
output
VCC
VCC
10 k
1
μ
F
Noise
canceller
50 k
4.2 V
A11730
+
32
VCC
10 k
MRC input
1 k
1
μ
F
A11731
+
33
HOLE
DET
SOFT
MUTE
Band
muting
SEEK
OFF
VCC
0.1
μ
F
C1
50 k
10 k
50 k
MUTE
AMP.
SD circuit
A11732
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.
In AM mode, the output
impedance is 10 k
.
To improve the low band
separation, use a coupling
capacitor of over 10 μF.
31
AM/FM detector output
FM S-meter output block
MRC AC input block
Adjust the external 1-k
resistor
to attenuate the MRC AC input
and control the circuit.
32
IF S-meter output and MRC
DC input
The muting time constant is
determined by an external RC
circuit as described below.
Attack time: T
A
= 10 k
×
C1
Release time: T
R
= 50 k
×
C1
Noise convergence adjustment
The noise convergence can be
adjusted when there is no input
signal by inserting a resistor
between pin 33 and ground.
33
Mute drive output
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) |
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| 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 |
| LA1781MD-B-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: |
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