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TEA6840H Arkusz danych(PDF) 2 Page - NXP Semiconductors |
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TEA6840H Arkusz danych(HTML) 2 Page - NXP Semiconductors |
2 / 44 page 1999 Jul 12 2 Philips Semiconductors Preliminary specification New In Car Entertainment (NICE) car radio TEA6840H FEATURES • FM mixer for conversion of FM RF from 65 to 108 MHz to IF of 10.7 MHz; the mixer provides inherent image rejection • FM RF mixer can be set to receive weather band radio up to 162.55 MHz; weather band radio flag output • AM mixer 1 for conversion of AM RF to AM IF1 10.7 MHz • LC tuner oscillator providing mixer frequencies for FM mixer and AM mixer 1 • AM mixer 2 for conversion of AM IF1 to AM IF2 450 kHz • Crystal oscillator providing mixer frequencies for AM mixer 2 and reference for synthesizer PLL, IF count, timing for Radio Data System (RDS) update and reference frequency for car audio signal processor IC • Fast synthesizer PLL tuning system with local control for inaudible RDS updating • Timing function for RDS update algorithm and control signal output for car audio signal processor ICs (TEA688x, SAA77xx) • Digital alignment circuit for conversion of LC oscillator tuning voltage to controlled alignment voltage of FM antenna tank circuit • AGC pin diode drive circuit for FM RF AGC; AGC detection at FM mixer input; the AGC pin diode drive can be activated by the I2C-bus as a local/distance function; AGC threshold is a programmable and keyed function switchable via the I2C-bus • FM IF linear amplifiers with high dynamic input range • FM quadrature demodulator with automatic centre frequency adjustment and Total Harmonic Distortion (THD) compensation • Level detector for AM and FM with temperature compensated output voltage; starting point and slope of level output is programmable via the I2C-bus • AM RF pin diode drive circuit; AGC threshold detection at AM mixer 1 and IF2 AGC input; threshold is programmable via the I2C-bus; AM IF2 AGC and demodulator • AM AF output switchable to provide AM IF2 for AM stereo decoder • AM noise blanker with blanking at AM IF2 • Several test modes available for fast IC and system tests. GENERAL DESCRIPTION The TEA6840H is a single chip car radio tuner for AM and FM intended for microcontroller tuning with the I2C-bus providing the following functions: • AM double conversion receiver for LW/MW/SW (31 m, 41 m and 49 m bands) with IF1 = 10.7 MHz and IF2 = 450 kHz • FM single conversion receiver with integrated image rejection for IF = 10.7 MHz capable of selecting US FM, US weather, Europe FM, East Europe FM and Japan FM bands. ORDERING INFORMATION TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TEA6840H QFP64 plastic quad flat package; 64 leads (lead length 1.95 mm); body 14 × 20 × 2.8 mm SOT319-2 |
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