参数资料
型号: LA1787M-MPB-E
厂商: ON Semiconductor
文件页数: 27/54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
3D AGC Sensitivity Characteristics
AGC sensitivity
Wide AGC sensitivity
? F
1
2
Second-channel
attenuation improvement
Narrow AGC sensitivity
3
Desired station AGC sensitivity
4
V23 (Desired station field strength)
A12075
Fig. 6
3D AGC Sensitivity — ? f, V 23 characteristics
? The wide AGC sensitivity is determined by the antenna and RF circuit selectivity, regardless of V 23 .
? The narrow AGC sensitivity is determined by the following.
The total selectivity of the antenna, RF circuit, and mixer when V 23 ≥ 0.5 V
The above selectivity and V 23 when V 23 < 0.5 V
? The improvement in the second-channel attenuation corresponds to the area occupied by the narrow AGC in the
total AGC sensitivity area.
Figure 8 on the next page shows the actual operation of the circuit.
? f — AGC on Level (ANT input)
110
fD = 98.1 MHz Second-channel pad
100
90
80
70
ANT IN
VIN
60
fu = 98.1 MHz + ? f
A12076
50
–5
–4
–3
–2
–1
0
1
2
3
4
5
? f — MHz
Fig. 7
No. 6655-27/54
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