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TDA5255E1 Datasheet(PDF) 49 Page - Infineon Technologies AG |
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TDA5255E1 Datasheet(HTML) 49 Page - Infineon Technologies AG |
49 / 91 page TDA5255 E1 Version 1.2 Application Data Sheet 49 2007-02-26 Choosing CL as large as possible results in a small pulling sensitivity. On the other hand a small CL keeps the influence of the serial inductance and the tolerances associated to it small (see formula [3-17]). Start-up Time where: -R: is the negative impedance of the oscillator see Figure 3-15 Rext: is the sum of all external resistances (e.g. R1 or any other resistance that may be present in the circuit, see Figure 3-14 The proportionality of L1 and C1 of the crystal is defined by formula [3-13]. For a crystal with a small C1 the start -up time will also be slower. Typically the lower the value of the crystal frequency, the lower the C1. A short conclusion regarding crystal and crystal oscillator dependencies is shown in the following table: The crystal oscillator in the TDA5255 is a NIC (negative impedance converter) oscillator type. The input impedance of this oscillator is a negative impedance in series to an inductance. Therefore the load capacitance of the crystal CL (specified by the crystal supplier) is transformed to the capacitance Cv as shown in formula [3-17]. Table 3-1 Crystal and crystal oscilator dependency Result Independent variable Relative Tolerance Maximum Deviation tStart-up C1 > >> >> < C0 > << - frequency of quartz > >>> > << LOSC > >> > - CL > >< - ()2 0 1 2 ´ L L S S L C C C C f f C D + − = = δ δ δ δ [3 – 15] ext Start R R L t − − 1 ~ [3 – 16] |
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