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