参数资料
型号: LA1787M-MPB-E
厂商: ON Semiconductor
文件页数: 42/54页
文件大小: 0K
描述: IC CAR RADIO TUNER 64QFP
标准包装: 60
频率: 520kHz ~ 1.71MHz,64MHz ~ 108MHz
调制或协议: AM,FM
应用: 车载音频
数据接口: PCB,表面贴装
天线连接器: PCB,表面贴装
电源电压: 8V
工作温度: -40°C ~ 85°C
封装/外壳: *
供应商设备封装: *
包装: *
LA1787M
5. 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.
20 k ?
41
To the
matrix
VO
(dB)
C
Fig. 45
2 π × C × 20 k ?
10
0
A12090
1
f C = ——————— [Hz]
Frequency Characteristics
Fig.47
Changes in the pin 41 capacitor capacitance (for a 100% high cut ratio)
0.001 μ F
1
2 π C × 20 k ?
Fig. 46
f
(Hz)
A12091
–10
0 μ
F
0.0022 μ F
–20
–30
–40
0.0047 μ F
5 7 1k
5 7 100
–50
–60
3
VCC = 8.0 V
f = 98 MHz 100%mod
80 dB μ IN
2 3
2
3
5 7 10k
2
3
Frequency, f — Hz
? Pilot canceler adjustment (pins 17 and 18)
Noise
canceler
input
30
To the
multiplexer
Fig. 48
Gate
Pilot
cancel
11
12 17
18
6800 pF 3.9 k ? 0.01 μ F 50 k ?
A12092
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.
No. 6655-42/54
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