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TEF6701HL Datasheet(PDF) 9 Page - NXP Semiconductors |
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TEF6701HL Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 55 page  9397 750 13471 © Koninklijke Philips Electronics N.V. 2004. All rights reserved. Product data sheet Rev. 01 — 16 November 2004 9 of 55 Philips Semiconductors TEF6701HL Car radio tuner front-end for digital IF 7.4 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 • Reference frequency for the IF counter • Timing signal for the RDS update algorithm. 7.5 PLL The fast synthesizer PLL tuning system with local control is used for inaudible RDS updating. 7.6 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. 7.7 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 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. 7.8 FM IF amplifier The FM IF amplifier provides 10.5 dB or 14 dB gain, selectable via the I2C-bus with high linearity over a wide dynamic range. In IBOC DAB mode (activated via the I2C-bus) FM IF is buffered and directly fed to FM IF AGC, bypassing the second FM ceramic filter. 7.9 FM IF AGC This is a linear FM IF AGC amplifier with multiplexed inputs for FM standard and FM IBOC DAB. The gain controlled FM IF is output by the multiplexed FM IF/AM IF2 buffer for a car IF DSP IC (e.g. SAA7724H). 7.10 AM tuner including mixer 1 and mixer 2 The AM tuner is realized in a double conversion technique and is capable of selecting LW, MW and SW bands. |
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