STMicroelectronics TDA7540N

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