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