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): 16/48頁
文件大小: 508K
代理商: LA1781M
LA1781M
No.6038-23/48
3D AGC Sensitivity Characteristics
Fig. 6
Figure 6 3D AGC Sensitivity -
Δf, V23 characteristics
The wide AGC sensitivity is determined by the antenna and RF circuit selectivity, regardless of V23.
The narrow AGC sensitivity is determined by the following.
The total selectivity of the antenna, RF circuit, and mixer when V23 ≥ 0.5V
The above selectivity and V23 when V23 < 0.5V
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.
Fig. 7
Second-channel
attenuation improvement
Desired station AGC sensitivity
4
3
2
1
ΔF
Narrow AGC sensitivity
V23 (Desired station field strength)
Wide AGC sensitivity
AGC sensitivity
ANT IN
VIN
Second-dhannel pad
fD = 98.1MHz
fu = 98.1MHz +
Δf
Δf -- AGC on Level (ANT input)
50
70
80
90
100
110
60
--5
--4
--3
--2
--1
5
4
3
2
1
0
Δf -- MHz
The
fu
input
level
at
which
antenna
damping
turns
on
--
dB
μ
When
Δf = 0, 98.1MHz
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