Recommended Test Equipment
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SNAU200 – September 2016
Copyright © 2016, Texas Instruments Incorporated
LMK04208 User’s Guide
8
Recommended Test Equipment
Power Supply
The Power Supply should be a low noise power supply, particularly when the devices on the board are
being directly powered (onboard LDO regulators bypassed).
Phase Noise / Spectrum Analyzer
To measure phase noise and RMS jitter, an Agilent E5052 Signal Source Analyzer is recommended. An
Agilent E4445A PSA Spectrum Analyzer with the Phase Noise option is also usable although the
architecture of the E5052 is superior for phase noise measurements. At frequencies less than 100 MHz
the local oscillator noise of the E4445A is too high and measurements will reflect the E4445A’s internal
local oscillator performance, not the device under test.
Oscilloscope
To measure the output clocks for AC performance, such as rise time or fall time, propagation delay, or
skew, it is suggested to use a real-time oscilloscope with at least 1 GHz analog input bandwidth (2.5+
GHz recommended) with 50-
Ω
inputs and 10+ Gsps sample rate. To evaluate clock synchronization or
phase alignment between multiple clock outputs, it is recommended to use phase-matched, 50-
Ω
cables
to minimize external sources of skew or other errors/distortion that may be introduced if using oscilloscope
probes.