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ADF7030-1 数据表(PDF) 6 Page - Analog Devices |
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ADF7030-1 数据表(HTML) 6 Page - Analog Devices |
6 / 15 page UG-957 ADF7030-1 Hardware Reference Manual Rev. 0 | Page 6 of 15 32.768 kHz Wake-Up Crystal (Optional) If a greater wake-up accuracy is needed than the accuracy provided by the internal 26 kHz oscillator, the user can connect an external 32.768 kHz crystal oscillator between the GPIO6 and GPIO7 pins. The crystal oscillator must be operated in parallel mode; two parallel loading capacitors are required for oscillation at the correct frequency. The values of the capacitors are dependent upon the crystal specification. The capacitors must be chosen to ensure the shunt value of capacitance added to the PCB track capacitance and the input pin capacitance of the ADF7030-1 equals the specified load capacitance of the crystal. Track capacitance values typically vary from 2 pF to 5 pF, depending on board layout. Ensure the lengths of the PCB traces from the crystal to the pins are as close to equal as possible. The total load capacitance can be calculated using the following equation: PCB PIN LOAD C C C2 C1 C + + + = 2 1 1 1 (2) where: CLOAD is the total load capacitance. C1 and C2 are the external crystal load capacitors. CPIN is the ADF7030-1 input capacitance of the GPIO6 and GPIO7 pins (refer to the ADF7030-1 data sheet). CPCB is the PCB track capacitance. To ensure stable frequency operation over all conditions, choose capacitors that have a very low temperature coefficient. |
类似零件编号 - ADF7030-1 |
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类似说明 - ADF7030-1 |
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