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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: 19/38頁
文件大小: 764K
代理商: LA1780M
AM
This section analyzes the gain in each of the blocks in the LA1780 when the Sanyo recommended circuit is used.
Test conditions
Ambient temperature:
26°C
Antenna and mixer 1 input frequency: 1 MHz
Mixer 2 input frequency:
10.71 MHz
IF and detector input frequencies:
450 kHz
An AM dummy is attached.
When an input level such that the output becomes –35 dBm is determined, the I/O characteristics of each stage were
determined to be as follows:
Antenna input: 9.5 dB
Mixer 1 input: 25.6 dB
Mixer 2 input: 29.5 dB
IF input:
36.0 dB
Detector input: 102.0 dB
These values allow the gains in each block to be calculated as follows.
RF gain:
16.1 dB
Mixer 1 gain: 3.9 dB
Mixer 2 gain: 6.5 dB
IF gain:
66.0 dB
No. 5724-26/38
LA1780M
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