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TEA5761UK Fiches technique(PDF) 7 Page - NXP Semiconductors |
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TEA5761UK Fiches technique(HTML) 7 Page - NXP Semiconductors |
7 / 45 page 9397 750 13451 © Koninklijke Philips Electronics N.V. 2006. All rights reserved. Product data sheet Rev. 01 — 2 August 2006 6 of 44 Philips Semiconductors TEA5761UK Low voltage single-chip FM stereo radio 8. Functional description 8.1 Low noise RF amplifier The LNA input impedance together with the LC RF input circuit defines an FM band filter. The gain of the LNA is controlled by the RF AGC circuit. 8.2 I/Q mixer 1st FM The FM quadrature mixer converts FM RF (76 MHz to 108 MHz) to IF. 8.3 VCO The LC tuned VCO provides the Local Oscillator (LO) signal for the FM quadrature mixer. The VCO frequency range is from 150 MHz to 217 MHz. No external varactor is required. 8.4 Crystal oscillator The crystal oscillator can operate with a 32.768 kHz clock crystal or via an external 32.768 kHz reference clock source connected to pin FREQIN. Selection between a reference clock or a reference crystal can be done by software programming via the I2C-bus. When a clock crystal is used, pin FREQIN must be left open-circuit, or when external clocking is used, there should be no crystal connected to pin XTAL. The temperature drift of 32.768 kHz clock crystals limits the operational temperature range. The preferred crystal specifications are given in Table 31. The crystal oscillator generates the reference frequency for: • Synthesizer PLL tuning system • Timing for the IF counter • Free running frequency adjustment of the stereo decoder VCO • Center frequency adjustment of the IF filters XTAL F1 crystal oscillator input GNDA F2 analog ground VAFL F4 left audio output i.c. F6 internally connected; leave open GNDD F7 digital ground FREQIN G1 32.768 kHz reference frequency input GNDA G2 analog ground n.c. G3 not connected MPXOUT G4 FM demodulator MPX output VAFR G5 right audio output TMUTE G6 soft mute time constant capacitor INTX G7 interrupt flag output Table 3: Pin description …continued Symbol Pin Description |
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