Description

The TDA7541 is a high performance tuner circuit with stereo decoder for AM/FM car radio. It contains a mixer, IF amplifier, demodulator for AM and FM, stereo decoder, quality detection, ISS filter and PLL synthesizer with IF counter on a single chip. Use of BICMOS technology allows the implementation of several tuning functions and a minimum of external components.

Features

■ FM part

– AGC generation by RF and IF detection

– I/Q mixer for 1st IF 10.7MHz with image rejection

– Mixer for 2nd IF 450kHz

– Internal 450kHz band pass filter with bandwidth control by ISS

– Fully integrated FM demodulator with noise cancellation

■ AM part

– Wide and narrow AGC generation

– Mixer for 1st IF 10.7MHz, AM upconversion

– Mixer for 2nd IF 450kHz

– Integrated AM-demodulator

– AM IF noise blanking

■ Stereo decoder

– PLL with adjustment free, fully integrated VCO

– Automatic pilot dependent MONO/STEREO switching

– Programmable ROLL-OFF compensation

– High cut and stereo blend-characteristics programmable

– Dedicated RDS mute

– Audio noise blanker

■ Additional features

– VCO for world tuning range

– High performance fast PLL for RDS System

– IF counter for FM and AM with search stop signal

– Quality detector for level, deviation, adjacent channel and multipath

– ISS (Intelligent selectivity system) for cancellation of adjacent channel and noise influences

– Adjacent channel mute

– Fully electronic alignment

– Independend weather band input

– All functions I2C bus controlled