User's Guide
SCAU020 – March 2007
10.9MHz–1175MHz Low Phase Noise Clock Evaluation Board
Figure 1. CDCE421EVM Evaluation Board
Features:
∙Easy-to-use evaluation module generates low phase noise clocks between 10.9MHz—1175MHz
∙Simple device programming via host-powered USB port
∙Fast configuration through provided software GUI
∙Total board power provided either through USB port or separate 3.3V and ground connections
∙LVCMOS input interface or crystal input
∙Standard 6-pin XO package connection available (for CDCE421-enabled XO devices)
1General Description
The CDCE421 is a high-performance, low phase noise clock generator. It has two fully integrated, low-noise, liquid crystal (LC)-based voltage-controlled oscillators (VCOs) that operate in the 1.75GHz–2.35GHz range.
The CDCE421 has an integrated crystal oscillator circuitry that operates in conjunction with an external AT-cut crystal to produce a stable frequency reference for the PLL-based frequency synthesizer. A 3.3V LVCMOS level input can also be used instead of a crystal to provide a PLL frequency reference.
The evaluation module (EVM) is designed to quickly demonstrate the electrical performance of the device. This fully assembled and factory-tested EVM allows complete validation of all device functions for a variety of applications. Throughout this document, the acronym EVM and the phrases evaluation module and evaluation board are synonymous with the CDCE421EVM. Figure 1 illustrates the CDCE421EVM.
For optimum performance, the board is equipped with 50Ω SMA connectors and well-controlled 50Ω impedance microstrip transmission lines.
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