Am Radio System For Electronically Tuned Radios - National Semiconductor

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 By National Semiconductor Corporation
LM1863 's PackagesLM1863 's pdf datasheet



LM1863 Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
LM1863 circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

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