參數(shù)資料
型號: LA1781M
廠商: Sanyo Electric Co.,Ltd.
英文描述: Single-Chip Tuner IC for Car Radios
中文描述: 單芯片調諧器IC的汽車收音機
文件頁數(shù): 30/50頁
文件大?。?/td> 567K
代理商: LA1781M
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. 6038-30/50
LA1781M
IF buffer
amp
IF
F.E.
5 V
0.022
μ
F
The 10.7 MHz feeds back through ground.
Test system capacitance
A12081
FM Soft Muting (1)
Antenna input
dB
μ
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
200 k
30 k
–20 dB
–30 dB
–40 dB
O
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