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