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参数资料
| 型号： | LA1787M |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO SINGLE CHIP RECEIVER, PQFP64 |
| 封装： | 14 X 14 MM, QFP-64 |
| 文件页数： | 17/54页 |
| 文件大小： | 606K |
| 代理商： | LA1787M |
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No. 6655-24/54
LA1787M
(4) Stereo indicator sensitivity improvement
The stereo indicator sensitivity (on/off) is equivalent to that of the LA1780M
Stereo on level
Stereo off level
LA1781M/1784M
4.1%
3.1%
LA1787M/1780M
2.6%
1.6%
*: The pilot level such that the stereo indicator goes on or off for a 10.7 MHz unmodulated IF input.
(5) FM oscillator circuit removed
The internal FM oscillator circuit provided in the LA1781M has been removed. The FM oscillator level can be
adjusted by constructing an external circuit block.
*: However, this requires 4 more external parts than the LA1781M: 1 transistor and 3 resistors/capacitors.
4
Vt
VCC
A13600
4
Vt
VCC
IC internal
A13601
LA1787M/1784M FM OSC
LA1780M/1781M FM OSC
3. Gain distribution
The table below shows the gain distribution of the LA1780M, LA1784M, and LA1787M. (These are measured
values.) Compared to the LA1784M, the total gain is lower.
1st MIX (10.7)
1st IF (10.7)
2nd MIX (450)
2nd IF (450)
LA1780M
10 dB
3.3 dB
3.2 dB
69 dB
LA1784M
7.5 dB
13 dB
7 dB
66 dB
LA1787M
7.5 dB
3.5 dB
8.6 dB
67 dB
First mixer
: No circuit changes from the LA1784M.
First IF amplifier
: Equivalent to the LA1780M circuit. (The gain is lower than that in the LA1781M and LA1784M.)
Second mixer
: The mixer circuit has been modified to improve adjacent channel suppression and interference.
Second IF amplifier
: Equivalent to the LA1780M circuit.
(Typical value)
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LA1787M_09 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Single-Chip Tuner IC for Car Radios |
| LA1787M-MPB-E | 功能描述:调谐器 CAR RADIO TUNER RoHS:否 制造商:NXP Semiconductors 功能: 噪声系数: 工作电源电压: 最小工作温度: 最大工作温度: |
| LA1787NM | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Single-Chip Car Radio System IC |
| LA1787NM_09 | 制造商:SANYO 制造商全称:Sanyo Semicon Device 功能描述:Single-Chip Car Radio System IC |
| LA1787NM-MPB-E | 制造商:ON Semiconductor 功能描述:ANALOG CAR RADIO TUNER - Trays 制造商:ON Semiconductor 功能描述:FTRAY / ANALOG CAR RADIO TUNER |
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