The CDCVF2505 is a high-performance, low-skew, low-jitter, phase-lock loop (PLL) clock driver. It uses a PLL to precisely align, in both frequency and phase, the output clocks (1Y[0–3] and CLKOUT) to the input clock signal (CLKIN). The CDCVF2505 operates at 3.3 V. It also provides integrated series-damping resistors that make it ideal for driving point-to-point loads.
One bank of five outputs provides low-skew, low-jitter copies of CLKIN. Output duty cycles are adjusted to 50 percent, independent of duty cycle at CLKIN. The device automatically goes in power-down mode when no input signal is applied to CLKIN.
Unlike many products containing PLLs, the CDCVF2505 does not require an external RC network. The loop filter for the PLLs is included on-chip, minimizing component count, space, and cost.
Because it is based on the PLL circuitry, the CDCVF2505 requires a stabilization time to achieve phase lock of the feedback signal to the reference signal. This stabilization is required following power up and application of a fixed-frequency, fixed-phase signal at CLKIN, and following any changes to the PLL reference.
The CDCVF2505 is characterized for operation from –40°C to 85°C.
Phase-Lock Loop Clock Driver for Synchronous DRAM and General-Purpose Applications
Spread Spectrum Clock Compatible
Operating Frequency: 24 MHz to 200 MHz
Low Jitter (Cycle-cycle): <|150 ps| Over the Range 66 MHz–200 MHz
Distributes One Clock Input to One Bank of Five Outputs (CLKOUT Is Used to Tune the Input-Output Delay)
Three-States Outputs When There Is no Input Clock
Operates From Single 3.3-V Supply
Available in 8-Pin TSSOP and 8-Pin SOIC Packages
Consumes Less Than 100-µA (Typically) in Power Down Mode
Internal Feedback Loop Is Used to Synchronize the Outputs to the Input Clock
25Ω On-Chip Series Damping Resistors
Integrated RC PLL Loop Filter Eliminates the Need for External Components