TDA7421N

TDA7421N AM/FM TUNER FOR CAR RADIO AND HI-FI APPLICATIONS PRELIMINARY DATA s HIGH PERFORMANCE FRONT-END IC FOR AM/FM RECEIVERS s FULLY INTEGRATED HIGH-SPEED PLL FOR OPTIMIZED RDS APPLICATIONS s FM MPX/AM AUDIO OUTPUT, 450kHz AM IF OUTPUT FOR STEREO AM APPLICATIONS s AM DOUBLE CONVERSION ARCHITECTURE s AM/FM STATION DETECTOR AND DIGITAL IF-COUNTER s SINGLE FREQUENCY REFERENCE FOR BOTH AM AND FM s FULL ELECTRICAL ADJUSTMENT s I2C-BUS PROGRAMMABLE DESCRIPTION The TDA7421N is a high-performance tuner circuit which integrates AM and FM sections, PLL frequency sinthesizer and IF counter on a single chip. Use of BICMOS technology allows the implementation of tuning functions with a minimum of external components.Value spread of external components can be fully compensated by means of on-chip elec- TQFP64 ORDERING NUMBER: TDA7421N trical adjustment controlled by external µP. The FM quality detection circuit, in conjunction with the digital IF counter, enables the stop-station function in “seek” mode and MPX mute during reception. The combination of programmable level detector and IF counter allows reliable AM stop-station performance. The Automatic Gain Control (AGC) operates on different signal bandwidths in order to optimize sensitivity and dynamic range. I2C-bus controls functions such as AGC, amplifier gains, PLL and counter settings. PIN CONNECTIONS AM AGC1 PIN AM AGC1 RF AMP AM AGC1 TC MIX OUT + MIX OUT FM IF AGC IN AM MIX2 IN + AM MIX2 INRF VCC AM MIX2 OUT AM SMETER TC F...