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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)： | 32/48頁 |
| 文件大?。?/td> | 508K |
| 代理商： | LA1781M |
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LA1781M
No.6038-38/48
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.
Fig. 45
Fig. 46
Pilot canceler adjustment (pins 17 and 18)
Fig. 48
The pilot canceler signal waveform (pin 19) is a 19kHz 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.
41
20k
Ω
C
To The
Matrix
VO
(dB)
f
(Hz)
2
πC × 20kΩ
1
2
π × C × 20kΩ
1
fC =
[Hz]
17
30
--
12
11
6800pF 3.9k
Ω
18
0.01
μF 50kΩ
Pilot
cancel
Gate
To the
multiplexer
NCoise
canceler
input
Frequency Characteristics
--60
--40
--30
--20
--10
0
--50
10
35 7 100
23
1k
7
52
2
3
10k
7
53
Frequency, f -- Hz
Attenuation,
HCC
-
dB
Changes in the pin 41 capacitor capacitance (for a 100% high cut ratio)
VCC = 8.0V
f = 98MHz 100%mod
80dB
μ IN
0.0022
μF
0.0047
μF
0.001
μF
0.01
μ
F
0μF
Fig. 47
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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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