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ATPL230A Datasheet(PDF) 113 Page - ATMEL Corporation |
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ATPL230A Datasheet(HTML) 113 Page - ATMEL Corporation |
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113 / 122 page  113 ATPL230A [DATASHEET] Atmel-43053J-ATPL230A-Datasheet_22-Sep-16 Figure 10-5. 20 MHz Crystal Oscillator Schematic CX = 2 x (CXTAL – CPARA20M – CPCB / 2) where CPCB is the ground referenced parasitic capacitance of the printed circuit board (PCB) on CLKEA and CLKEB tracks. As a practical example, taking the following crystal part number: Manufacturer: TXC CORPORATION Part Number: 9C-20.000MAAJ-T Frequency: 20.000 MHz Tolerance: 30 ppm (as low as possible to fullfil PRIME specification requirements) CXTAL = 18 pF Working in a typical layout / substrate with CPCB = 1 pF The value of the external capacitors on CLKEA and CLKEB should be CX = 2 x (18 - 4 - 0.5) = 27 pF It is strongly recommended to use capacitors with the lowest temperature stability possible. In this practical example, a suitable part number could be: Manufacturer: MURATA Part Number: GRM1885C1H270FA01D Capacitance: 27 pF Tolerance: 1 % Dielectric: C0G / NP0 (0 drift) CLKEA CLKEB CX C X ATPL230A CPARA20M C PCB C PCB RS |
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