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TEA5768HL Datenblatt(PDF) 7 Page - NXP Semiconductors |
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TEA5768HL Datenblatt(HTML) 7 Page - NXP Semiconductors |
7 / 36 page 2004 Sep 13 7 Philips Semiconductors Product specification Low-power FM stereo radio for handheld applications TEA5768HL TEA5768HL CPOUT LIMDEC2 VCOTANK1 LIMDEC1 VCOTANK2 TIFC VCC(VCO) Vref DGND MPXO VCCD TMUTE DATA VAFR CLOCK VAFL 001aab494 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 Fig.2 Pin configuration. 7 FUNCTIONAL DESCRIPTION 7.1 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. 7.2 FM mixer The FM quadrature mixer converts the FM RF (76 MHz to 108 MHz) to an IF of 225 kHz. 7.3 VCO The varactor tuned LC VCO provides the Local Oscillator (LO) signal for the FM quadrature mixer. The VCO frequency range is 150 MHz to 217 MHz. 7.4 Crystal oscillator The crystal oscillator can operate with a 32.768 kHz clock crystal or a 13 MHz crystal. The temperature drift of standard 32.768 kHz clock crystals limits the operational temperature range from −10 °C to +60 °C. The PLL synthesizer can be clocked externally with a 32.768 kHz, a 6.5 MHz or a 13 MHz signal via pin XTAL2. The crystal oscillator generates the reference frequency for: • The reference frequency divider for the synthesizer PLL • The timing for the IF counter • The free-running frequency adjustment of the stereo decoder VCO • The centre frequency adjustment of the IF filters. 7.5 PLL tuning system The PLL synthesizer tuning system is suitable to operate with a 32.768 kHz or a 13 MHz reference frequency generated by the crystal oscillator or applied to the IC from an external source. The synthesizer can also be clocked via pin XTAL2 at 6.5 MHz. The PLL tuning system can perform an autonomous search tuning function. 7.6 RF AGC The RF AGC prevents overloading and limits the amount of intermodulation products created by strong adjacent channels. |
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