CSTCR4M91G55Z-R0 - Murata Electronics

CSTCR4M91G55Z-R0 Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for optimal performance?
  Murata recommends a symmetrical PCB layout with a ground plane underneath the oscillator to minimize noise and radiation. A 4-layer PCB with a dedicated ground layer is ideal. Keep the oscillator away from high-frequency components and ensure a clear return path for the ground connection.
• How do I handle the oscillator's start-up time and stability?
  The CSTCR4M91G55Z-R0 has a typical start-up time of 2-5 ms. To ensure stability, allow the oscillator to stabilize for at least 10 ms before using its output. You can also add a reset circuit or a power-on reset (POR) to ensure the oscillator is properly initialized.
• What is the recommended drive level for the oscillator's output?
  The recommended drive level for the CSTCR4M91G55Z-R0's output is 15 pF to 30 pF. Exceeding this drive level may affect the oscillator's frequency stability and amplitude. Use a suitable load capacitor to match the recommended drive level.
• How do I ensure the oscillator's frequency accuracy and stability over temperature?
  To ensure frequency accuracy and stability, use a high-quality crystal with a low frequency tolerance (e.g., ±10 ppm). Also, consider using a temperature-compensated crystal oscillator (TCXO) or a voltage-controlled crystal oscillator (VCXO) if your application requires high frequency stability over temperature.
• What is the oscillator's EMI and RFI susceptibility?
  The CSTCR4M91G55Z-R0 is susceptible to electromagnetic interference (EMI) and radio-frequency interference (RFI). To minimize the impact, use a shielded enclosure, keep the oscillator away from high-frequency sources, and ensure a good ground connection. You can also add EMI filters or shielding to the PCB design.