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參數(shù)資料
型號(hào)： 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(yè)數(shù)： 33/50頁(yè)
文件大小： 568K
代理商： LA1784M
No. 6039-39/50
LA1784M
41
20 k
C
To the
matrix
A12090
VO
(dB)
f
(Hz)
2
πC × 20 k
1
A12091
–60
–50
–40
–30
–20
–10
0
10
3
5
7 100
2
3
5
7 1k
2
3
5
7 10k
2
3
VCC = 8.0 V
f = 98 MHz 100%mod
80 dB
IN
Changes in the pin 41 capacitor capacitance (for a 100% high cut ratio)
0.0047
F
0.0022
F
0.001
F
0.01
F
0
F
Attenuation,
HCC
—
dB
Frequency, f — Hz
Frequency Characteristics Fig.47
8. Multiplexer Block
HCC (high cut control) frequency characteristics (pin 41)
When the HCC function operates, the frequency characteristics of the output signal are determined by the
capacitance of the external capacitor connected to pin 41.
1
fC = ——————— [Hz]
2
π × C × 20 k
Fig. 45
Fig. 46
17
30
–
12
11
6800 pF 3.9 k
18
0.01
F 50 k
Pilot
cancel
Gate
To the
multiplexer
Noise
canceler
input
A12092
Pilot canceler adjustment (pins 17 and 18)
Fig. 48
The pilot canceler signal waveform (pin 19) is a 19 kHz signal that contains no third harmonic as shown in figure
48. Since this signal has the same phase as the pilot signal, no capacitor is required between pin 18 and ground.
Since it has no third harmonic component, excellent pilot cancellation can be acquired in both the left and right
channels by adjusting with a variable resistor.
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