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的汽車收音機(jī)
文件頁(yè)數(shù)： 24/50頁(yè)
文件大?。?/td> 568K
代理商： LA1784
3D AGC Sensitivity Characteristics
No. 6039-24/50
LA1784M
Second-channel
attenuation improvement
Desired station AGC sensitivity
4
3
2
1
F
Narrow AGC sensitivity
V23 (Desired station field strength)
Wide AGC sensitivity
AGC sensitivity
A12075
Figure 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.
–4
–5
–2
–3
–1
f — MHz
0
50
60
70
80
90
100
110
1
2
3
4
5
T
μ
f — AGC on Level (ANT input)
A12076
ANT IN
VIN
Second-channel pad
fD = 98.1 MHz
fu = 98.1 MHz +
f
Fig. 6
Fig. 7
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