CDCV857BIDGG datasheet by Texas Instruments

CDCV857BIDGG Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the CDCV857BIDGG?
  The recommended power-up sequence is to apply VCC first, followed by VDD, and then the input clock signal. This ensures proper initialization and prevents potential latch-up conditions.
• How do I handle the output clock signal when the input clock signal is not present?
  When the input clock signal is not present, the output clock signal will be in a high-impedance state. It's recommended to use a pull-down resistor or a clock buffer with a built-in pull-down to ensure a stable output clock signal.
• What is the maximum input clock frequency that the CDCV857BIDGG can handle?
  The maximum input clock frequency is 200 MHz, but it's recommended to derate the frequency based on the specific application and operating conditions to ensure reliable operation.
• Can I use the CDCV857BIDGG as a clock buffer with a fanout of more than 7?
  While the CDCV857BIDGG is designed for a fanout of up to 7, it's possible to use it with a higher fanout by adding external buffers or repeaters. However, this may impact the signal integrity and jitter performance.
• How do I determine the optimal value for the output clock signal termination resistor?
  The optimal value for the output clock signal termination resistor depends on the specific application, PCB layout, and signal integrity requirements. A good starting point is to use a 50-ohm resistor, but it may need to be adjusted based on simulation and measurement results.