Datasheet

November 2013 LMK3806 Evaluation Board SNAU075A 15

11. 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 ohm inputs and 10+ Gsps sample rate. To evaluate clock

synchronization or phase alignment between multiple clock outputs, it’s recommended to use phase-

matched, 50-ohm cables to minimize external sources of skew or other errors/distortion that may be

introduced if using oscilloscope probes.