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SiTime SiT6731EB User Manual

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Table of Contents

Contents
1 Introduction ............................................................................................................................................. 1
2 I/O Descriptions ....................................................................................................................................... 2
3 EVB Usage Descriptions ........................................................................................................................... 2
3.1 EVB Configurations .......................................................................................................................... 2
3.2 Waveform Capturing Using Active Probe ........................................................................................ 4
3.3 Measuring Jitter and Phase Noise ................................................................................................... 5
3.4 Current Measurement ..................................................................................................................... 5
Appendix A .................................................................................................................................................... 6
1

Introduction

The SiT6731EB evaluation board (EVB) is designed for use with SiTime's Emerald OCXOs in the 10-pin
9x7 mm package. It enables the evaluation of key functionalities of these OCXOs.
EVB Features
-
SMA output for direct or buffered connection to measurement equipment
-
Probing points for accurate waveform measurement
2
-
Provision for I
C control interface (connector)
SiTime typically ships the EVB with the OCXO mounted. The OCXO device should only be evaluated in its
original soldered down state for best signal integrity and frequency stability. For best results the device
should not be de-soldered and then re-soldered either manually or via reflow process.
SiT6731EB Manual Rev. 3.0
SiT6731EB Evaluation Board
User Manual
Page 1 of 9
www.sitime.com

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Summary of Contents for SiTime SiT6731EB

  • Page 1: Table Of Contents

    Provision for I C control interface (connector) SiTime typically ships the EVB with the OCXO mounted. The OCXO device should only be evaluated in its original soldered down state for best signal integrity and frequency stability. For best results the device should not be de-soldered and then re-soldered either manually or via reflow process.

  • Page 2: O Descriptions

    EVB Usage Descriptions EVB Configurations SiT6731EB comes designed to support OCXO and DCOCXO devices. Oscillator output can be accessed in several ways listed in Table 1. Table 2 describes components configuration to support all output configurations. SiT6731EB Manual Rev. 3.0 Page 2 of 9 www.sitime.com...
  • Page 3 “DNP” are not assembled. Shipment Configuration SiT6731EB is shipped configured for buffered output allowing connecting it to the instrument input using 50 Ω coax cable. Details on the board assembly for shipment configuration can be found on the schematic (see...

  • Page 4: Waveform Capturing Using Active Probe

    Eliminating such distortion requires a probe with the lowest input capacitance and a low inductance ground lead. In addition, SiTime OCXOs are typically configured for fast rise and fall times (2.5 ns or less) with 15 pF load. It is therefore critical that the probe tip ground be as short as possible, lowest inductance, and the return path for the ground be located as close as possible to the trace carrying the RF logic signal.

  • Page 5: Measuring Jitter And Phase Noise

    SiT6731EB Evaluation Board User Manual Measuring Jitter and Phase Noise For jitter and phase noise measurements, buffered output configuration is recommended. SiTime OCXO was not designed to drive 50 Ω load directly so buffer avoids excessive current draw from the device output.
  • Page 6 LVCMOS 0.1 uF Clipped Sine 0 Ohm Buffered output LVCMOS 0 Ohm DNP Clipped Sine 0.1 uF 10 k 10 k Probe LVCMOS Clipped Sine Figure A1. SiT6731EB EVB Electrical schematics SiT6731EB Manual Rev. 3.0 Page 6 of 9 www.sitime.com...
  • Page 7 SiT6731EB Evaluation Board User Manual Table A1. Bill of Materials (BOM) Reference Designators Description SMD component size Value C1, C10 Capacitor 0603 10uF C2, C5, C6 Capacitor 0402 0.1uF C3, C4, C8, C9 Capacitors 0402 Capacitors 0402 0603 Green SMA connector...
  • Page 8 SiT6731EB Evaluation Board User Manual Probe test points VDD sense Signal Figure A2. SiT6731EB EVB SiT6731EB Manual Rev. 3.0 Page 8 of 9 www.sitime.com...
  • Page 9 © SiTime Corporation, May 2022. The information contained herein is subject to change at any time without notice. SiTime assumes no responsibility or liability for any loss, damage or defect of a Product which is caused in whole or in part by (i) use of any circuitry other than circuitry embodied in a SiTime product, (ii) misuse or abuse including static discharge, neglect or accident, (iii) unauthorized modification or repairs which have been soldered or altered during assembly and are not capable of being tested by SiTime under its normal test conditions, or (iv) improper installation, storage, handling, warehousing or transportation, or (v) being subjected to unusual physical, thermal, or electrical stress.

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