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參數(shù)資料
| 型號： | LA1784M |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封裝： | QIP-64 |
| 文件頁數(shù)： | 24/50頁 |
| 文件大?。?/td> | 568K |
| 代理商： | LA1784M |
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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.
FM Muting control pin (pin 47) (R47: 30 k
variable resistor)
The –3 dB 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 –40 dB 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.
The attenuation can be set by making R33 smaller as listed
in the table above.
No. 6039-30/50
LA1784M
IF buffer
amp
IF
F.E.
5 V
0.022
F
The 10.7 MHz feeds back through ground.
Test system capacitance
A12081
FM Soft Muting (1)
Antenna input — dB
O
u
tp
u
t
n
o
is
e
—
d
B
DET out
Noise
15 k
10 k
20 k
R47 = 7.5 k
Fig.19
58
100
R58
A11764
R33
A11765
33
Fig. 18
Fig. 20
R58
Mute ATT
Open
–20 dB
200 k
–30 dB
30 k
–40 dB
Output,
noise
—
dB
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相關(guān)代理商/技術(shù)參數(shù) |
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| LA1787M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Single-Chip Tuner IC for Car Radios |
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