CDCEL949PW datasheet by Texas Instruments

CDCEL949PW Frequently Asked Questions (FAQs)

• What is the recommended layout and routing for the CDCEL949PW to minimize noise and EMI?
  Texas Instruments recommends a 4-layer PCB with a solid ground plane, and to keep the input and output traces as short as possible. Additionally, use a common mode choke or ferrite bead to filter the input power and reduce EMI.
• How do I ensure the CDCEL949PW is properly powered and what are the power sequencing requirements?
  The CDCEL949PW requires a single 3.3V or 5V power supply. Ensure the power supply is stable and has a low noise floor. Power sequencing is not critical, but it's recommended to power the device after the input clock is stable.
• What is the maximum clock frequency that the CDCEL949PW can handle?
  The CDCEL949PW can handle clock frequencies up to 200 MHz. However, the maximum frequency may vary depending on the specific application and output load.
• How do I configure the CDCEL949PW for a specific output frequency and what are the limitations?
  The CDCEL949PW can be configured using the SEL0-SEL2 pins to select one of 16 possible output frequencies. The output frequency range is from 25 MHz to 200 MHz. The device can also be used in a voltage-controlled oscillator (VCO) mode to generate frequencies outside of the predefined range.
• What is the typical jitter performance of the CDCEL949PW and how does it affect the system?
  The CDCEL949PW has a typical jitter performance of 150 fs RMS. Jitter can affect the system by causing errors in data transmission, increasing bit error rates, and reducing the overall system reliability.