Description
The TDA7421N is a high-performance tuner circuit which integrates AM and FM sections, PLL frequency synthesizer 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 electrical adjustment controlled by external microprocessor.

Features
■ High performance front-end IC for AM/FM
   receivers
■ Fully integrated high-speed PLL for optimized
   RDS applications
■ FM MPX/AM audio output, 450 kHz AM IF
   output for stereo AM applications
■ AM double conversion architecture
■ AM/FM station detector and digital IF-counter
■ Single frequency reference for both AM and FM
■ Full electrical adjustment
■ i2c bus programmable