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參數(shù)資料
| 型號： | LA1781M |
| 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 |
| 文件頁數(shù)： | 22/50頁 |
| 文件大?。?/td> | 567K |
| 代理商： | LA1781M |
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Usage Notes
1. Notes on V
CC
and Ground
2. Notes on AM Coil Connection
The V
CC
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. V
CC
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 V
CC
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.
No. 6038-22/50
LA1781M
Pin 40
V
CC
for the FM IF, AM, NC, MPX, and MRC blocks
Ground for the FM IF and AM blocks
Pin 25
Pin 14
Ground for the NC, MPX, and MRC blocks
Pin 61
V
CC
for the FM front end, AM first mixer, and first oscillator blocks
V
CC
for the FM front end and AGC blocks, and the AM/FM switching pin
Ground for the FM front end, first mixer, and first oscillator blocks
*
Pin 6
Pin 3
–4
–5
–2
–3
–1
f — MHz
0
50
70
80
90
100
110
60
1
2
3
4
5
When
f = 0, 98.1 MHz
The wide AGC
sensitivity when
pin 39 is 5 V.
A
μ
f — AGC Sensitivity
The narrow AGC
sensitivity when
pin 39 is at ground.
Pin 6 voltage
Mode
8
FM
OPEN
AM
Fig. 1
Fig. 2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LA1781M_09 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Car Radios Single-Chip Tuner IC |
| LA1781MA-MPB-E | 功能描述:調(diào)諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| LA1781MD-A-MPB-E | 制造商:ON Semiconductor 功能描述:ANALOG CAR RADIO TUNER - Trays |
| LA1781MD-B-MPB-E | 功能描述:調(diào)諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
| LA1781ML-MPB-E | 功能描述:調(diào)諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數(shù): 工作電源電壓: 最小工作溫度: 最大工作溫度: |
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