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LM1863 Datasheet

  • LM1863

  • National Semiconductor [AM Radio System for Electronically ...

  • NSC

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LM1863 AM Radio System for Electronically Tuned Radios
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
Y
Y
Y
Y
Y
Y
Y
Y
Y
Low supply current
Level-controlled low phase noise local oscillator
Buffered local oscillator output
Stop circuitry with adjustable stop threshold and adjust-
able stop window
Open collector stop output
Excellent THD and stop time performance
Large amount of recovered audio
RF AGC with open collector output
Meter output
Compatible with AM stereo
Block Diagram
TL H 5185 鈥?1
Order Number LM1863M
See NS Package Number M20B
C
1995 National Semiconductor Corporation
TL H 5185
RRD-B30M115 Printed in U S A

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