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R18.97
The CXA1538M/N/S is high performance one-chip bipolar ICs designed for FM stereo/AM radios. These include an FM/AM front end, FM/AM IF amplifier, FM/AM detection output and FM stereo demodulator output. Features Low current consumption (In FM mode ID=11.0 mA, in AM mode 8.5 mA, VCC=6.0 V) Built-in LED drive circuit for tuning Built-in LED drive circuit for stereo indicator Built-in muting circuit for the FM band Few external parts Absolute Maximum Ratings (Ta=25 °C) Supply voltage VCC 14 V Operating temperature Topr to +60 °C Storage temperature Tstg to +150 °C Junction temperature Tjmax 125 °C Allowable power dissipation CXA1538M 30 pin SOP (Plastic) CXA1538S 30 pin SDIP (Plastic)
Recommended Operating Conditions Supply voltage VCC to 9 Structure Bipolar silicon monolithic IC
Pin Description and Equivalent Circuit No. Symbol Pin Voltage (V) FM AM Equivalent circuit Description
Stereo indicator drive circuit and output for VCO check
AFC pin in J band, determines time constant of AGC in AM (depending on external capacitor). AFC pin in W band, determines time constant of AGC in AM (depending on external capacitor).
DescriptionGND of FM/AM IF and DET stage Time constant for muting provided
GND of FM/AM front end FM RF amplifier circuit for FM RF input FM RF amplifier circuit to connect to RF tank circuit
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