UG123: SiOCXO1-EVB Evaluation Board User's Guide
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1 UG123: SiOCXO1-EVB Evaluation Board User's Guide The Silicon Labs SiOCXO1-EVB (kit) is used to help evaluate Silicon Labs Jitter Attenuator and Network Synchronization products for Stratum 3/3E, IEEE 1588 and G SyncE applications. EVB FEATURES: Flexible Output Termination Power Supply Filtering Optional Output Buffer Optional OCXO Voltage Control Adjust Figure.1. SiOCXO1-EB silabs.com Building a more connected world. Rev. 1.1
2 Quick Start 1. Quick Start Refer to Figure 3.1 Functional Block Diagram on page 4, Figure 3.2 SiOCXO1-EB Shown Populated with an OCXO on page 4, and Figure 4.1 SiOCXO1-EB Configured with Si5348 EVB on page 6 to clarify the instructions below. 1. Connect power to J1, and note that start-up current could be on the order of 1 amp. Check the manufacturers warm-up time. 2. Connect SiOCXO1-EB output, J2, to the Si5348 REF clock input using the short SMA cable provided with the EVB kit. silabs.com Building a more connected world. Rev
3 Top Layer View of Board 2. Top Layer View of Board Figure 2.1. Top Layer View of Board silabs.com Building a more connected world. Rev
4 Functional Description 3. Functional Description The SiOCXO1-EB is used in conjunction with Silicon Labs precision timing devices to facilitate characterization. The SiOCXO1-EB was designed to maximize output termination configurations as well as optional control voltage terminations. Resistors and capacitors are 0, which makes it simple to remove and add various values. The SiOCXO1-EB bill of materials and PCB layouts are in Section 7. Bill of Materials and Section 6. Schematic. The block diagram for the board is provided below: Figure 3.1. Functional Block Diagram The SiOCXO1-EB is intended to be a general use board for a 7-pin OCXO with 22x25 nominal package size, such as the Rakon P/N STP MHz pictured below. See Section 6. Schematic for example measurements carried out using this OCXO. Figure 3.2. SiOCXO1-EB Shown Populated with an OCXO 3.1 Power Supply The power supply voltage and current requirements are listed in the manufacturers data sheet. A 3.3 V ±5% supply is required. R6 may require modification if other voltages are used. Also, note the OCXO initial current can be on the order of 1A. Power supply filtering has been added to the evaluation board to minimize spurious response. silabs.com Building a more connected world. Rev
5 Functional Description 3.2 Output Termination and Optional Buffer In most applications simple R C termination is used, as seen with R1 and C4 in Figure 6.1 SiOCXO1-EB Schematic on page 8. This is a resistor to optimize impedance matching and a capacitor to block DC. Modifications can be made as required. Optionally a buffer can be added to minimize loading on the OCXO s output, such as when driving cables. In this case U2, J6, C7, C8, R8, and R9 must be populated, while R2 can be depopulated. 3.3 Optional OCXO Frequency Adjust Some OCXO s have an optional control voltage to adjust the output frequency, usually by a small amount such as 1 or 2 ppm. One example would be to discipline the OCXO to reduce the effects of OCXO aging. In this case, J3 and R4 must be populated as a minimum. C6 can be used for filtering or BW frequency limiting. Alternatively, R5 and C6 could be fixed or adjustable resistors to set a DC bias voltage. silabs.com Building a more connected world. Rev
6 Configuring the SiOCXO-EB 4. Configuring the SiOCXO-EB Figure 4.1. SiOCXO1-EB Configured with Si5348 EVB The connection between the SiOCXO-EB and Si5348 EVB should be kept as short as possible. It is recommended to use a UPS Power Supply back-up for long term testing. silabs.com Building a more connected world. Rev
7 SiOCOXO1-EB Functionality Test 5. SiOCOXO1-EB Functionality Test 1. Connect power to J1 (3.3 V). 2. Connect SiOCXO1-EB Output, J2, to an oscilloscope (terminate into 50 Ω). 3. Verify that the red LED is illuminated, the current draw matches closely to the specs, and the output matches the OCXO s data sheet. 5.1 Example Measurement Results Using STP3158LF 12.8 MHz OCXO from Rakon Table 5.1. Current Specs for Rakon P/N STP MHz at U1 Example Current Draw Expected Value (Data Sheet) Example Measured Value Warm-up 0.9 A 0.72 A Steady State 0.3 A 0.29 A Notes on Current Settling: 1. The system (including the LED and OCXO) initially drew A of current from the 3.3 V power supply. At one minute, the current draw slightly decreased by A (warm-up time). Around the minute mark the current decreased rapidly to A. Then, the system decreased slightly to its consistent steady state current of 0.30 A within 20 minutes. 2. The LED draws around 10 ma, so subtract this from the power supply (system) current to get the current draw of the OCXO alone. These are the values reflected in the table above. Steady State Output Waveform for Rakon P/N STP MHz at U1 Verify the output is a 12.8 MHz LVCMOS waveform. For example, measure with a Tektronix TDS 20245, 200 MHz oscilloscope terminated with 50 Ω BNC T connector. silabs.com Building a more connected world. Rev
8 Schematic 6. Schematic Figure 6.1. SiOCXO1-EB Schematic silabs.com Building a more connected world. Rev
9 Bill of Materials 7. Bill of Materials Table 7.1. SiOCXO1-EB Bill of Materials Item Quantity Reference Part Manufacturer Manufacturer Part Number 1 1 C1 10UF_805 Venkel C0805Y 5V6R31 06ZN 2 2 C2,C8 100N Venkel C0402X 7R6R3-104KNE 3 1 C3 10NF Venkel LIC0204 X6S6R3-103MN E 4 2 C4,C5 100N Venkel C0X 7R KNE BOM Digikey Footprint Comment D1 Red Panasonic LN1271 RAL P493CT-ND LED_gull_flip 8 5 H1,H2,H3,H 4,H5 HOLE_NU M4 plated- Num4hole 9 1 J1 Phoenix_2_scre w Phoenix MKDSN 1.5/ ND Phoenix2pinM_p2pit ch 10 1 J2 SMA_ED GE Johnson J502-ND SMA_EDGE_p J4,J5 Jmpr_1pin 1pin_p1pitch 13 1 L1 Ferrite Steward HI1612X 560R R Venkel CR0-16W-37 R4FT 15 1 R2 0 ohm Venkel CR0-16W-00 0T 18 1 R6 150 Venkel CR0-16W-15 00FT U MHz Rakon STP315 8 Alternate = Connor Winfield OH CF M or AVX OO M1 4070AT 5 1 C6 1UF Venkel C0X 7R6R3-105KNE silabs.com Building a more connected world. Rev
10 Bill of Materials Item Quantity Reference Part Manufacturer Manufacturer Part Number BOM Digikey Footprint Comment 6 1 C7 100N Venkel C0X 7R KNE 11 2 J3,J6 SMA_ED GE Johnson J502-ND SMA_EDGE_p R3,R Venkel CR0-16W-49 R9FT 17 2 R4,R5 1K Venkel CR0-16W-10 01FT 19 2 R8,R10 0 ohm Venkel CR0-16W-00 0T 20 1 R Venkel CR0-16W-37 R4FT 22 1 U2 NC7SV34 Fairchild NC7SV3 4P5X NC7SV34P5X- ND SC-70-5 Alternate = Fairchild NC7SZ126M5X Note: The OCXO must be populated if it is not. silabs.com Building a more connected world. Rev
11 Layout 8. Layout Figure 8.1. Layer 1: Primary Side Figure 8.2. Layer 2: Ground silabs.com Building a more connected world. Rev
12 Layout Figure 8.3. Layer 3: Power Figure 8.4. Layer 4: Secondary Side silabs.com Building a more connected world. Rev
13 ClockBuilder Pro One-click access to Timing tools, documentation, software, source code libraries & more. Available for Windows and ios (CBGo only). Timing Portfolio SW/HW Quality Support and Community community.silabs.com Disclaimer Silicon Labs intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Labs products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Labs reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. Silicon Labs shall have no liability for the consequences of use of the information supplied herein. This document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products are not designed or authorized to be used within any Life Support System without the specific written consent of Silicon Labs. A "Life Support System" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal injury or death. Silicon Labs products are not designed or authorized for military applications. Silicon Labs products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons. Trademark Information Silicon Laboratories Inc., Silicon Laboratories, Silicon Labs, SiLabs and the Silicon Labs logo, Bluegiga, Bluegiga Logo, Clockbuilder, CMEMS, DSPLL, EFM, EFM32, EFR, Ember, Energy Micro, Energy Micro logo and combinations thereof, "the world s most energy friendly microcontrollers", Ember, EZLink, EZRadio, EZRadioPRO, Gecko, ISOmodem, Micrium, Precision32, ProSLIC, Simplicity Studio, SiPHY, Telegesis, the Telegesis Logo, USBXpress, Zentri, Z-Wave, and others are trademarks or registered trademarks of Silicon Labs. ARM, CORTEX, Cortex-M3 and THUMB are trademarks or registered trademarks of ARM Holdings. Keil is a registered trademark of ARM Limited. All other products or brand names mentioned herein are trademarks of their respective holders. Silicon Laboratories Inc. 400 West Cesar Chavez Austin, TX USA
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Date CET Initials Name Justification
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