Texas Instruments recommends following a specific layout and routing guideline for the CDC203DW to minimize signal integrity issues and ensure optimal performance. This includes keeping the clock signal traces short and away from noisy signals, using a solid ground plane, and placing decoupling capacitors close to the device.
The CDC203DW requires a specific power-up and power-down sequencing to ensure proper operation. The recommended sequence is to power up the VCC supply first, followed by the VCCIO supply, and then the clock signal. During power-down, the clock signal should be disabled first, followed by the VCCIO supply, and finally the VCC supply.
While the datasheet specifies a maximum clock frequency of 200 MHz, the actual frequency limit may vary depending on the specific application and board design. In general, it's recommended to derate the clock frequency by 10-20% to account for signal integrity and jitter considerations.
To troubleshoot issues with the CDC203DW's clock output, start by verifying the input clock signal quality and ensuring that it meets the device's input clock requirements. Check for signal integrity issues, such as jitter, noise, and skew, and ensure that the output clock signal is properly terminated and routed.
While the CDC203DW is designed to support 50% duty cycle clock signals, it can also be used in non-50% duty cycle applications with some limitations. However, the device's output clock signal may not be symmetrical, and the duty cycle may vary depending on the input clock signal and device configuration.
CDC203DW datasheet
by Texas Instruments
