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LM1865 Advanced FM IF System
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 signal 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)
Y Y Y
Meter output proportional to signal level Stop detector with open-collector output Adjustable signal level mute stop threshold controlled either by ultrasonic noise in the recovered aud...