參數(shù)資料
型號: LA1787M
廠商: Sanyo Electric Co.,Ltd.
英文描述: Single-Chip Tuner IC for Car Radios
中文描述: 單芯片調諧器IC的汽車收音機
文件頁數(shù): 23/54頁
文件大?。?/td> 606K
代理商: LA1787M
No. 6655-23/54
LA1787M
2. Modified circuits
The following characteristics have been improved over those of the The LA1784M.
The AM adjacent channel interference characteristics (
40 kHz) have been improved.
The AM S-meter curve slope has been increased.
The FM separation temperature characteristics have been improved.
The stereo indicator sensitivity has been improved.
The FM oscillator circuit has been omitted.
(1) AM interference characteristics improvement
The second signal interference and suppression have been improved for adjacent channels (±40 kHz) by increasing
the AM second mixer input dynamic range.
(2) The AM S-meter curve slope has been increased.
The slope of the AM S-Meter curve has been increased from that of the LA1781M and LA1784M.
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LA1787M
LA1780M
LA1781M
AM S-Meter Voltage
Antenna input — dB
μ
S
(3) FM separation temperature characteristics improvement
The temperature characteristics have been improved, the amount of change in the separation due to drift when at
power on has been stabilized. This makes it easier to adjust the separation.
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Change in Separation (LA1781M): First IF Input
Time after power on — minutes
C
Change in Separation (LA1787M): First IF Input
Time after power on — minutes
C
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