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DESCRIPTION

The TDA7512 is a high performance tuner circuit for AM/FM car radio. It contains mixer, IF amplifier, demodulator for AM and FM, 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.

FM-PART

■ RF AGC GENERATION BY RF AND IF DETECTION

■ I/Q MIXER FOR 1ST FM IF 10.7MHz WITH IMAGE REJECTION

■ 2 PROGRAMMABLE IF-GAIN STAGES

■ MIXER FOR 2nd IF 450KHz

■ INTERNAL 450KHz BANDPASS FILTER WITH THREE BANDWIDTHS CONTROLLED BY ISS

■ FULLY INTEGRATED FM-DEMODULATOR WITH NOISE CANCELLATION

AM-PART

■ WIDE AND NARROW AGC GENERATION

■ PREAMPLIFIER AND MIXER FOR 1ST IF 10.7MHz, AM UPCONVERSION

■ MIXER FOR 2nd IF 450KHz

■ INTEGRATED AM-DEMODULATOR

■ OUTPUT FOR AM-STEREO-DECODER

ADDITIONAL FEATURES

■ VCO FOR WORLD TUNING RANGE

■ HIGH PERFORMANCE FAST PLL FOR RDSSYSTEM

■ IF COUNTER FOR FM AND AM WITH SEARCH STOP SIGNAL

■ QUALITY DETECTOR FOR LEVEL, DEVIATION, ADJACENT CHANNEL AND MULTIPATH

■ QUALITY DETECTION INFORMATIONS AS ANALOG SIGNALS EXTERNAL AVAILABLE

■ ISS (INTELLIGENT SELECTIVITY SYSTEM) FOR CANCELLATION OF ADJACENT CHANNEL AND NOISE INFLUENCES

■ ADJACENT CHANNEL MUTE

■ FULLY ELECTRONIC ALIGNMENT

■ ALL FUNCTIONS I2C-BUS CONTROLLED

■ ISS FILTER STATUS INFORMATION I2C-BUS READABLE