Abracon recommends a 4-layer PCB with a solid ground plane on the bottom layer, and a separate power plane for the oscillator circuit. Additionally, keep the oscillator circuit as close to the crystal as possible, and use a low-impedance path for the crystal connections.
To ensure reliable startup, Abracon recommends applying power to the device slowly (dv/dt < 1V/ms), and ensuring that the power supply is stable and noise-free. Additionally, the crystal should be properly matched to the oscillator circuit, and the load capacitance should be within the recommended range.
The AMPDDFH-A09T is rated for operation from -40°C to +85°C, but Abracon recommends derating the frequency tolerance and stability over the full temperature range.
While the AMPDDFH-A09T is optimized for 32.768 kHz crystals, Abracon recommends consulting their application engineers for custom frequency options. The device may require modifications to the internal oscillator circuit or external component values to ensure reliable operation at a different frequency.
Abracon recommends checking the power supply, crystal connections, and PCB layout for any issues. Use an oscilloscope to verify the oscillator output, and consult the datasheet and application notes for troubleshooting guidelines.
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AMPDDFH-A09T Overview
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