TEA6845H

Product Summary

The TEA6845H is a single IC with car radio tuner for AM, FM and Weather Band (WB) intended for microcontroller tuning with the I2C-bus. The TEA6846H provides the following functions: AM double conversion receiver for LW, MW and SW (31 m, 41 m and 49 m bands) with IF1 = 10.7 MHz and IF2 = 450 kHz. FM double conversion receiver with integrated image rejection for IF1 and for IF2 capable of selecting US FM, US weather, Europe FM, East Europe FM and Japan FM bands; fully integrated dynamic selectivity at 450 kHz FM IF2; FM demodulator with dynamic threshold extension; centre frequency alignment of IF2 selectivity via the I2C-bus. The tuning system of the TEA6846H includes VCO, crystal oscillator and PLL synthesizer on one chip.

Parametrics

TEA6845H absolute maximum ratings: (1)VDDA1 analog supply voltage 1 for on-chip power supply: -0.3 +10 V; (2)VDDA2 analog supply voltage 2 for on-chip power supply: -0.3 +6.5 V; (3)VDDA3 analog supply voltage 3 for VCO: -0.3 +10 V; (4)VDDA4 analog supply voltage 4 for tuning PLL: -0.3 +10 V; (5)VDDA5 analog supply voltage 5 for FM and AM RF: -0.3 +10 V; (6)VDDA6 analog supply voltage 6 for IF amplifier 1 and 2: -0.3 +10 V; (7)VDDD digital supply voltage: -0.3 +6.5 V; (8)DVDD8.5-DD5 difference between any 8.5 V supply voltage and any 5 V supply voltage: 0.3 V; (9)Tstg storage temperature: -55 +150 ℃; (10)Tamb ambient temperature: -40 +85 ℃.

Features

TEA6845H features: (1)AM mixer 1 for conversion of AM RF to AM IF1 of 10.7 MHz; (2)LC tuner oscillator providing mixer frequencies for FM mixer and AM mixer 1; (3)AM mixer 2 for conversion of AM IF1 to AM IF2 of 450 kHz; (4)Crystal oscillator providing mixer frequencies for AM mixer 2 and FM mixer 2 and reference for synthesizer PLL, IF count, timing for Radio Data System (RDS) update and reference frequency for car audio signal processor ICs; (5)Fast synthesizer PLL tuning system with local control for inaudible RDS updating; (6)Timing function for RDS update algorithm and control signal output for car audio signal processor ICs (TEA688x, SAA77xx, TEF689x); (7)Digital alignment circuit for bus controlled matching of oscillator tuning voltage to FM antenna tank circuit tuning voltage.

Diagrams