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參數(shù)資料
| 型號： | LM1865 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Advanced FM IF System |
| 中文描述： | 先進(jìn)的調(diào)頻中頻系統(tǒng) |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 309K |
| 代理商： | LM1865 |
TL/H/7509
L
February 1995
LM1865 Advanced FM IF System
General Description
Reduced external component cost, improved performance,
and additonal functions are key features to the LM1865 FM
IF system. The LM1865 is designed for use in electronically
tuned radio applications. It contains both deviation and sig-
nal level stop circuitry in addition to an open-collector stop
output. The LM1865 generates a reverse AGC voltage (ie:
decreasing AGC voltage with increasing signal).
Features
Y
On-chip buffer to provide gain and terminate two ce-
ramic filters
Y
Low distortion 0.1% typical with a single tuned quadra-
ture coil for 100% modulation.
Y
Broad off frequency distortion characteristic
Y
Low THD at minimum AFT offset
Y
Meter output proportional to signal level
Y
Stop detector with open-collector output
Y
Adjustable signal level mute/stop threshold, controlled
either by ultrasonic noise in the recovered audio or by
the meter output
Y
Adjustable deviation mute/stop threshold
Y
Separate time constants for signal level and deviation
mute/stop
Y
Dual threshold AGC eliminates need for local/distance
switch and offers improved immunity from third order in-
termodulation products due to tuner overload
Y
User control of both AGC thresholds
Y
Excellent signal to noise ratio, AM rejection and system
limiting sensitivity
Block Diagram
Order Number LM1865M
or LM1865N
See NS Package Number
M20B or N20A
TL/H/7509–1
FIGURE 1
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM1865M | Advanced FM IF System |
| LM1865N | Advanced FM IF System |
| LM1868 | Radio System |
| LM1868N | Radio System |
| LM1870 | STEREO DEMODULATOR WITH BLEND |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1865M | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced FM IF System |
| LM1865N | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Advanced FM IF System |
| LM1865N/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FM Receiver Circuit |
| LM1865N/B+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:FM Receiver Circuit |
| LM1866 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LOW VOLTAGE AM/FM RECEIVER |
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