1. General des criptionThe TEF6862 is a single-chip car radio tuner for AM, FM and weather band receptionproviding AM double conversion for LW, MW and full range SW (11 m to 120 m bands)with IF1 = 10.7 MHz and IF2 = 450 kHz.FM double conversion to IF1 = 10.7 MHz and IF2 = 450 kHz with integrated imagerejection for both IF1 and IF2; integrated IF filter with variable bandwidth and automaticbandwidth control algorithm with flexibility via the I2C-bus; capable of US FM, Europe FM,Japan FM, East Europe FM and weather band reception; all FM bands can be selectedusing high injection LO or low injection LO in the FM mixer 1.Tuning system including crystal oscillator, VCO, PLL synthesizer and state machine fortiming uncritical control of search, preset change and AF check via microcontroller.2. Featuresn High dynamic range FM front-end mixer for conversion of FM RF (65 MHz to 108 MHzand USA weather band) to an IF frequency of 10.7 MHz; mixer provides inherentimage rejection which can be switched from low injection LO to high injection LO viathe I2C-busn FM front-end AGC PIN diode drive circuit; AGC detection at the FM font-end mixerinput and the IF filter input; AGC threshold for detection at the mixer input isprogrammable and keyed AGC function can be selected via the I2C-bus; the AGC PINdiode drive can be activated by the I2C-bus for a search tuning in local mode; inAM mode the AGC PIN diode drive can be activated by the I2C-bus if required;information on amount of PIN diode AGC is available via the I2C-busn FM front-end mixer includes +6 dB gain setting via the I2C-busn FM second mixer for conversion of IF1 10.7 MHz to IF2 450 kHz including inherentimage rejection; the gain can be controlled via the I2C-busn Integrated FM channel selection filter with continuous variable bandwidth providingsimultaneous low distortion and high selectivity with only one external ceramic filter;improved sensitivity with dynamic threshold extension can be enabled via the I2C-busn Fully integrated FM demodulator with very low distortionn Digital bandwidth control algorithm with detection on adjacent channel information,deviation, detuning and level with customer flexibility via the I2C-busn Digital alignment circuit for bus controlled adjustment of oscillator tuning voltage to twoFM antenna tank circuit tuning voltages; AM and FM level start and slope alignment;IF filter and demodulator center frequency alignmentn AM and FM level detection (signal strength indication)n Separate RF input to FM front-end mixer for weather bandn Flag or voltage output indicators for actual IF bandwidth information