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參數(shù)資料
| 型號： | LM1863M |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 接收器 |
| 英文描述： | AM Radio System for Electronically Tuned Radios |
| 中文描述： | AM, AUDIO SINGLE CHIP RECEIVER, PDSO20 |
| 封裝： | PLASTIC, SOP-20 |
| 文件頁數(shù)： | 1/14頁 |
| 文件大小： | 268K |
| 代理商： | LM1863M |
TL/H/5185
L
May 1989
LM1863 AM Radio System for
Electronically Tuned Radios
General Description
The LM1863 is a high performance AM radio system intend-
ed primarily for electronically tuned radios. Important to this
application is an on-chip stop detector circuit which allows
for a user adjustable signal level threshold and center fre-
quency stop window. The IC uses a low phase noise, level-
controlled local oscillator.
Low phase noise is important for AM stereo which detects
phase noise as noise in the L-R channel. A buffered output
for the local oscillator allows the IC to directly drive a phase
locked loop synthesizer. The IC uses a RF AGC detector to
gain reduce an external RF stage thereby preventing over-
load by strong signals. An improved noise floor and lower
THD are achieved through gain reduction of the IF stage.
Fast AGC settling time, which is important for accurate stop
detection, and excellent THD performance are achieved
with the use of a two pole AGC system. Low tweet radiation
and sufficient gain are provided to allow the IC to also be
used in conjunction with a loopstick antenna.
Features
Y
Low supply current
Y
Level-controlled, low phase noise local oscillator
Y
Buffered local oscillator output
Y
Stop circuitry with adjustable stop threshold and adjust-
able stop window
Y
Open collector stop output
Y
Excellent THD and stop time performance
Y
Large amount of recovered audio
Y
RF AGC with open collector output
Y
Meter output
Y
Compatible with AM stereo
Block Diagram
TL/H/5185–1
Order Number LM1863M
See NS Package Number M20B
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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| LM1863N/A+ | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:AM Receiver Circuit |
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| 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 |
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