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CY28446LFXC Datasheet(PDF) 8 Page - SpectraLinear Inc |
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CY28446LFXC Datasheet(HTML) 8 Page - SpectraLinear Inc |
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8 / 19 page  CY28446 Rev 1.0, November 20, 2006 Page 8 of 19 . The CY28446 requires a Parallel Resonance Crystal. Substi- tuting a series resonance crystal causes the CY28446 to operate at the wrong frequency and violate the ppm specifi- cation. For most applications there is a 300-ppm frequency shift between series and parallel crystals due to incorrect loading Crystal Loading Crystal loading plays a critical role in achieving low ppm perfor- mance. To realize low ppm performance, use the total capac- itance the crystal sees to calculate the appropriate capacitive loading (CL). Figure 1 shows a typical crystal configuration using the two trim capacitors. It is important that the trim capacitors are in series with the crystal. It is not true that load capacitors are in parallel with the crystal and are approximately equal to the load capacitance of the crystal. . Calculating Load Capacitors In addition to the standard external trim capacitors, consider the trace capacitance and pin capacitance to calculate the crystal loading correctly. Again, the capacitance on each side Byte 8: Control Register 7 Bit @Pup Name Description 7 0 Reserved Reserved set to 0 6 1 SRC[T/C]10 SRC[T/C]10 Output Enable 0 = Disable (Tri-state), 1 = Enable 5 1 SRC[T/C]9 SRC[T/C]9 Output Enable 0 = Disable (Tri-state), 1 = Enable 4 1 SRC[T/C]8 SRC[T/C]8 Output Enable 0 = Disable (Tri-state), 1 = Enable 3 0 Reserved Reserved set to 0 2 0 SRC10 Allow control of SRC[T/C]10 with assertion of OEA# 0 = Free running, 1 = Stopped with OEA# 1 0 SRC9 Allow control of SRC[T/C]9 with assertion of OEB# 0 = Free running, 1 = Stopped with OEB# 0 0 SRC8 Allow control of SRC[T/C]8 with assertion of OEA# 0 = Free running, 1 = Stopped with OEA# Byte 9: Control Register 8 Bit @Pup Name Description 7 0 PCI3 33-MHz Output drive strength 0 = Low, 1 = High 6 0 PCI2 33-MHz Output drive strength 0 = Low, 1 = High 5 0 PCI1 33-MHz Output drive strength 0 = Low, 1 = High 4 0 PCI0 33-MHz Output drive strength 0 = Low, 1 = High 3 0 PCIF0 33-MHz Output drive strength 0 = Low, 1 = High 2 1 Reserved Reserved set to 1 1 1 Reserved Reserved set to 1 0 1 Reserved Reserved set to 1 Crystal Recommendations Frequency (Fund) Cut Loading Load Cap Drive (max.) Shunt Cap (max.) Motional (max.) Tolerance (max.) Stability (max.) Aging (max.) 14.31818 MHz AT Parallel 20 pF 0.1 mW 5 pF 0.016 pF 35 ppm 30 ppm 5 ppm Figure 1. Crystal Capacitive Clarification |
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