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TEA6849H Fiches technique(PDF) 9 Page - NXP Semiconductors |
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TEA6849H Fiches technique(HTML) 9 Page - NXP Semiconductors |
9 / 65 page 2003 Dec 19 9 Philips Semiconductors Product specification New In Car Entertainment car radio tuner IC with Precision Adjacent Channel Suppression (NICE-PACS) TEA6849H 7 FUNCTIONAL DESCRIPTION 7.1 Oscillators 7.1.1 VCO The varactor tuned VCO provides the local oscillator signal for both FM and AM mixer 1. It has a frequency range of 162.9 to 248.2 MHz. 7.1.2 PLL Fast synthesizer PLL tuning system with local control for inaudible RDS updating. 7.1.3 CRYSTAL OSCILLATOR The crystal oscillator provides a 20.5 MHz signal that is used for: • Reference frequency for frequency synthesizer PLL • Local oscillator for AM mixer 2 and FM mixer 2 • Reference frequency for the IF counter • Timing signal for the RDS update algorithm • Reference frequency (75.368 kHz) for the TEA688x (car audio signal processor - CASP) or TEF689x (car radio integrated signal processor - CRISP). 7.2 DAA To reduce the number of manual alignments in production the following I2C-bus controlled Digital Auto Alignment (DAA) functions are included: • FM RF DAA – 7-bit DAA circuitry for the conversion of the VCO tuning voltage to a controlled alignment voltage for the FM antenna tank circuit • FM and AM level DAA – Level DAA circuitry for alignment of slope (3-bit) and starting point (5-bit) of the level curve • IF2 centre DAA – Centre frequency alignment (7-bit) of integrated FM IF2 dynamic selectivity. 7.3 FM signal channel 7.3.1 FM MIXER 1 FM quadrature mixer converts FM RF (65 to 108 MHz and weather band) to IF of 10.7 MHz. The FM mixer provides inherent image rejection and high RF sensitivity. It is capable of tuning the US FM, US weather, Europe FM, Japan FM and East Europe FM bands: • US FM = 87.9 to 107.9 MHz • US weather FM = 162.4 to 162.55 MHz • Europe FM = 87.5 to 108 MHz • Japan FM = 76 to 91 MHz • East Europe FM = 65 to 74 MHz. 7.3.2 BUFFER OUTPUT FOR WEATHER BAND FLAG (PIN WBFLAG) The buffer output on pin WBFLAG is HIGH for weather band mode. 7.3.3 FM KEYED AGC The AGC threshold is programmable and the keyed AGC function is switchable via the I2C-bus. AGC detection occurs at the input of the first FM mixer. If the keyed AGC function is activated, the AGC is keyed only by the narrow band level. The AGC PIN diode drive can be activated via the I2C-bus as a local function for search tuning. The AGC sources a constant 10 mA current into the FM PIN diode in AM mode. 7.3.4 FM IF AMPLIFIER The FM IF amplifier provides 18 dB amplification with high linearity over a wide dynamic range. 7.3.5 FM MIXER 2 The FM mixer 2 converts 10.7 MHz FM IF1 to 450 kHz FM IF2 in I and Q phase to achieve image rejection in the demodulator. |
Numéro de pièce similaire - TEA6849H |
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Description similaire - TEA6849H |
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