CDCE(L)949 4-PLL VCXO Clock Synthesizers Texas Instruments CDCE(L)949 4-PLL VCXO Clock Synthesizers are a modular PLL-based, low-cost, high-performance, programmable clock synthesizer, multiplier, and divider. These devices generate up to 9 output clocks from a single input frequency. Each output can be programmed in-system for any clock frequency up to 230MHz, using up to four independent configurable PLLs.