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參數資料
| 型號： | LA1780M |
| 元件分類： | 調諧器 |
| 英文描述： | 2-BAND, AUDIO TUNER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數： | 18/38頁 |
| 文件大小： | 764K |
| 代理商： | LA1780M |
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Noise canceller notes
The characteristics of the noise canceller have been
improved by implementing the circuit that determines the
gate time in logic. In earlier noise canceller circuits, since
the time constant was determined with an RC circuit such
as the one shown in figure 5, the rise time was influenced
by the RC circuit time constant as show in figure 6. This
meant that the rise was delayed and the associated
switching delay resulted in a reduction of the circuit’s
ability to exclude noise.
In the LA1780M, the rise time is made shorter by
implementing the circuit that determines the gate time in
logic. This allows the LA1780M to eliminate noise
reliably.
Gain distribution (FM)
This section analyzes the gain in each of the blocks in the LA1780M when the Sanyo recommended circuit is used.
Test conditions
Ambient temperature:
26°C
Antenna and mixer input frequency: 98.1 MHz
First and second IF input frequency: 10.7 MHz
Input levels when VSM = 2 V were measured to be:
Antenna input: 19 dB
Mixer input:
30 dB
First IF input:
42 dB
Second IF input: 60 dB
These values allow the gains in each block to be calculated as follows.
RF gain:
11 dB
Mixer gain: 12 dB
No. 5724-25/38
LA1780M
Figure 5
Figure 6
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LA1780MA-A-MPB-E | 制造商:ON Semiconductor 功能描述:ANALOG CAR RADIO TUNER - Trays 制造商:Rochester Electronics LLC 功能描述: 制造商:ON Semiconductor 功能描述:FTRAY - ANALOG CAR RADIO TUNER |
| LA1781M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For Car Radios Single-Chip Tuner IC |
| 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:調諧器 RoHS:否 制造商:NXP Semiconductors 功能: 噪聲系數: 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 |
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