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參數資料
| 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： | 14/48頁 |
| 文件大小： | 508K |
| 代理商： | LA1781M |
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LA1781M
No.6038-21/48
Usage Notes
1. Notes on VCC and Ground
Pin 40
VCC for the FM IF, AM, NC, MPX, and MRC blocks
Pin 25
Ground for the FM IF and AM blocks
Pin 14
Ground for the NC, MPX, and MRC blocks
Pin 61
VCC for the FM front end, AM first mixer, and first oscillator blocks
*Pin 6
VCC for the FM front end and AGC blocks, and the AM/FM switching pin
Pin 3
Ground for the FM front end, first mixer, and first oscillator blocks
2. Notes on AM Coil Connection
The VCC used for the first oscillator coil connected to pin 7 must be at the same potential as pin 61.
Connect to the IFT connected with pin 45, and to the MIX coil connected with pin 54. VCC must be at the same
potential as pin 40.
3. AM/FM Switching
Pin 6 is also used as the FM front end and RF AGC VCC
Pin 6 voltage
Mode
8
FM
OPEN
AM
Fig. 1
4. Notes on the FM Front End
Notes on interference rejection characteristics
Intermodulation characteristics
The LA1781M applies two high-band AGC functions to prevent IM (the generation of intermodulation). These are
the narrow AGC (pin 58 : mixer input detection type) and the wide AGC (for the pin 55 input), and this results in the
antenna frequency characteristics shown in figure 2. The levels at which the AGC functions turn on are determined by
the capacitors attached at pins 55 and 58.
Fig. 2
V6pin
8
3.3
AM
FM
AM
Δf -- AGC Sensitivity
50
70
80
90
100
110
60
--5
--4
--3
--2
--1
5
4
3
2
1
0
Δf -- MHz
AGC
sensitivity
-
dB
μ
When
Δf = 0, 98.1MHz
The wide AGC
sensitivity when
pin 39 is 5V.
The narrow AGC
sensitivity when
pin 39 is at ground.
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