Texas Instruments provides a recommended PCB layout in the datasheet, but it's essential to follow good high-frequency design practices, such as using a solid ground plane, minimizing trace lengths, and avoiding vias under the device. Additionally, ensure that the input and output traces are well-separated to minimize coupling.
The PLL1707IDBQRQ1 can generate a wide range of output frequencies. To choose the correct output frequency, consider the application's requirements, such as the clock frequency of the target device, and ensure that the output frequency is within the device's specified range. Use the device's frequency calculation formula or online calculators to determine the correct output frequency.
The recommended power-up sequence is to apply power to the VCC pin first, followed by the VDD pin. This ensures that the internal voltage regulators are properly initialized. Additionally, ensure that the input clock signal is stable and within the specified frequency range before enabling the PLL.
To troubleshoot PLL lock issues, check the input clock signal quality, ensure that the input frequency is within the specified range, and verify that the PLL is properly configured. Use an oscilloscope to monitor the input and output signals, and check for any signs of jitter or noise. Consult the datasheet and application notes for additional troubleshooting guidance.
The maximum input clock frequency for the PLL1707IDBQRQ1 is 350 MHz. However, the device can also be used with lower input frequencies, such as 10 MHz or 25 MHz, depending on the application's requirements.
PLL1707IDBQRQ1 datasheet
by Texas Instruments
