參數(shù)資料
型號(hào)： LA1784
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(diào)諧器IC的汽車(chē)收音機(jī)
文件頁(yè)數(shù)： 39/50頁(yè)
文件大?。?/td> 568K
代理商： LA1784
No. 6039-39/50
LA1784M
41
20 k
C
To the
matrix
A12090
VO
(dB)
f
(Hz)
2
π
C
×
20 k
1
A12091
–60
–50
–40
–30
–20
–10
0
10
3
5
7100
2
3
Frequency, f — Hz
5
71k
2
3
5
710k
2
3
VCC = 8.0 V
f = 98 MHz 100%mod
80 dB
μ
IN
Changes in the pin 41 capacitor capacitance (for a 100% high cut ratio)
0.0047
μ
F
0.0022
μ
F
0.001
μ
F
00
μ
F
0
μ
F
A
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
f
C
= ——————— [Hz]
2
π
×
C
×
20 k
Fig. 45
Fig. 46
17
30
–
12
11
6800 pF 3.9 k
18
0.01
μ
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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