The MC13028A is a third generation C–QUAM stereo decoder targeted for use in low voltage, low cost AM/FM E.T.R. radio applications. Advanced features include a signal quality detector that analyzes signal strength, signal to noise ratio, and stereo pilot tone before switching to the stereo mode. A “blend function” much like FM stereo has been added to improve the transition from mono to stereo. The audio output level is adjustable to allow easy interface with a variety of AM/FM tuner chips. The external components have been minimized to keep the total system cost low.

• Adjustable Audio Output Level

• Stereo Blend Function

• Stereo Threshold Adjustment

• Operation from 2.2 V to 12 V Supply

• Precision Pilot Tone Detector

• Forced Mono Function

• Single Pinout VCO

• IF Amplifier with IF AGC Circuit

• VCO Shutdown Mode at Weak Signal Condition