Texas Instruments SCAU020 사용자 설명서
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General Description
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
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
connections
•
LVCMOS input interface or crystal input
•
Standard 6-pin XO package connection available (for CDCE421-enabled XO
devices)
devices)
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.
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.
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.
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.
illustrates the CDCE421EVM.
For optimum performance, the board is equipped with 50
Ω
SMA connectors and well-controlled 50
Ω
impedance microstrip transmission lines.
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All other trademarks are the property of their respective owners.
All other trademarks are the property of their respective owners.
SCAU020 – March 2007
10.9MHz–1175MHz Low Phase Noise Clock Evaluation Board
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