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参数资料
| 型号： | LA1787M |
| 厂商： | SANYO SEMICONDUCTOR CO LTD |
| 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： | 18/54页 |
| 文件大小： | 606K |
| 代理商： | LA1787M |
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No. 6655-25/54
LA1787M
4. Changes to applications
Component values that change from LA1781M/LA1784M applications
(Since the total AM gain has changed in the LA1787M)
AM SD adjustment resistor (pin 55): Because Vsm is higher.
AM level adjustment resistor (pin 31): Since the post-detection audio amplifier gain is higher than in the LA1781M
and LA1784M, the output level is also higher. This resistor must be changed
to match the set value.
AM mixer coil (pin 54), IFT coil (pin 45) damp resistor: Since the IF block gain is increased, the mixer (pin 54) and
IFT (pin 45) coil damping must be adjusted.
Separation adjustment resistor (pin 19): Since an internal 4 k
resistor has been added to the pin 19 input circuit to
improve the separation temperature characteristics, the value of the external
resistor must be reduced from that used with the LA1780M, LA1781M, and
LA1784M. (See the following page.)
19
30k
0.047
F
DECODER
Composite Sign
19
30k
Added 4 k
resistor
5k
0.047
F
DECODER
Composite Sign
5k
A13602
A13603
LA1781M/1784M
LA1787M
1. Notes on the FM Front End
Notes on interference rejection characteristics
Intermodulation characteristics
The LA1787M 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.
–4
–5
–2
–3
–1
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.
AGC
sensitivity
—
dB
f — MHz
f — AGC Sensitivity
The narrow AGC
sensitivity when
pin 39 is at ground.
Fig. 2
Functions
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相关代理商/技术参数 |
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|---|---|
| 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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