Audio ICs AM radio / FM IF stereo system IC BA1450S The BA1450S is a tuner system IC for electronic tuning for AM radios, FM IF, and MPX. It has been developed for Hi-Fi component applications. The MPX VCO circuit requires no adjustment, which will enable a reduction in the number of production line processes. In particular, the laser lock technique used in the VCO means that no external adjustment is required. Applications Synthesized tuner for Hi-Fi components. Features 1) Built-in AM monaural radio, FM IF amplifier / detector, and FM stereo demodulator. 2) DTS (both SD and IF count) compatible. 3) Built-in reference voltage power supply provides good shortwave band frequency stability. 4) Good FM stability. 5) The FM MPX VCO uses laser locking making adjustment and external components unnecessary. 6) Built-in forced monaural operation function for MPX (VCO stops, and LED goes off). 7) Low cutoff of audio is possible to improve AM fidelity. 8) MPX VCO stops in AM mode. 9) Audio muting is possible when an IF request is made. Absolute maximum ratings (Ta = 25C) Recommended operating conditions (Ta = 25C) 295 Audio ICs Block diagram 296 BA1450S Audio ICs BA1450S Input / output circuits 297 Audio ICs 298 BA1450S Audio ICs BA1450S 299 Audio ICs 300 BA1450S Audio ICs BA1450S Electrical characteristics (unless otherwise noted, Ta = 25C and VCC = 5V) FM IF MPX signal source: fIN = 10.7MHz, modulation 1kHz, 75kHzdev (100%) FM IF MPX signal source fIN = 10.7MHz, modulation 19kHz 7.5kHzdev (10%) IF MPX signal sourceAM: fIN = 1000kHz, modulation 1kHz 30% 301 Audio ICs Measurement circuit 302 BA1450S Audio ICs BA1450S Application example Electrical characteristics curves 303 Audio ICs BA1450S External dimensions (Units: mm) 304