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參數(shù)資料
| 型號： | LA1781M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | 14 X 14 MM, QIP-64 |
| 文件頁數(shù)： | 22/48頁 |
| 文件大?。?/td> | 508K |
| 代理商： | LA1781M |
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LA1781M
No.6038-29/48
However, when testing this stop sensitivity, note that when checking the waveform on the IF count buffer output
(pin 23), there are cases, such as that shown below, where current in the test system may be seen as flowing to
ground and cause oscillation that causes the IF count buffer output to go to the output state.
Fig. 18
FM Muting control pin (pin 47) (R47 : 30k
Ω variable resistor)
The -3dB limiting sensitivity can be adjusted with R47.
FM muting attenuation adjustment (pin 58)
The muting attenuation can be switched between the three levels of -20, -30, and -40dB by the resistor inserted
between pin 58 and ground. (Note that the exact values depend on the total tuner gain.)
The noise convergence with no input is determined by the pin 58 voltage.
R58
Mute ATT
Open
-20dB
200k
Ω
-30dB
30k
Ω
-40dB
The attenuation can be set by making R33 smaller as listed
in the table above.
Fig. 20
IF BUFFER
AMP
IF
F.E.
5V
0.022
μF
The 10.7MHz feeds back through ground.
Test system capacitance
58
R33
100
Ω
R58
33
FM Soft Muting (1)
--70
--40
--30
--20
--10
0
--50
--60
10
--20
--10
30
20
10
040
Antenna input -- dB
μ
Output,
noise
-
dB
R47 = 7.5k
Ω
DET out
Noise
15k
Ω
10k
Ω
20k
Ω
Fig. 19
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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 |
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| LA1781ML-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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