INTRODUCTION
The KA22900 is a monolithic intergrated circuit which consists of a 3V one chip tuner and FM multiplex for AM/FM radios and head phone radios.

FUNCTIONS
* FM Stage : RF/IF/AF amp, Quadrature Detector, MIX, OSC, Tuning Indicator.
* AM Stage : RF/IF/AF amp, Detector, MIX, OSC, AGC, Tuning Indicator.
* MPX Stage : PLL amp, Decoder, Flip Flop, VCO Stop, Phase Detector, Stereo Indicator.

FEATURES
· 3V one chip tuner with built - in FM Multiplex
· No AM detect coil, IF coupling capacitor, FM IF by-pass capacitor needed.
· Built-in tuning indicator function.
· Built-in AM/FM selection switch.
· Minimum number of external parts required.
· Wide operating voltage range : VCC = 1.8V ~ 7V
· Low distortion (FM IF : 0.4%, AM IF : 1%, 0.2% (Typ) ).