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ATA5756 Datasheet(PDF) 8 Page - ATMEL Corporation |
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ATA5756 Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 20 page 8 4702J–RKE–09/08 ATA5756/ATA5757 Figure 4-4. Timing ASK Mode with ENABLE Connected to the Microcontroller 4.3 Accuracy of Frequency Deviation The accuracy of the frequency deviation using the XTAL pulling method is about ±20% if the fol- lowing tolerances are considered. One important aspect is that the values of C 0 and CM of typical crystals are strongly correlated which reduces the tolerance of the frequency deviation. Figure 4-5. Tolerances of Frequency Modulation Using a crystal with a motional capacitance of C M = 4.37 fF ±15%, a nominal load capacitance of C LNOM = 18 pF and a parallel capacitance of C0 = 1.30 pF correlated with CM results in C 0 = 297 × CM (the correlation has a tolerance of 10%, so C0 = 267 to 326 × CM). If using the internal FSK switch with C Switch = 0.9 pF ±20% and estimated parasites of CStray = 0.7 pF ±10%, the resulting C 4 and C5 values are C4 = 10 pF ±1% and C5 = 15 pF ±1% for a nominal frequency deviation of ±19.3 kHz with worst case tolerances of ±15.8 kHz to ±23.2 kHz. FSK CLK Power-up, PA off ASK ΔT XTO Power-down Power-up, PA on (High) > 250 µs Power-down Power-up, PA off (Low) ENABLE ~ V S XTAL C M L M R S C 0 C Stray C 4 C 5 Crystal equivalent circuit C Switch |
Similar Part No. - ATA5756_08 |
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Similar Description - ATA5756_08 |
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