User’s Guide March 2012 LMK00308EVM User’s Guide 1. General Description This user guide describes how to set up and operate the LMK00308 evaluation module (EVM). The LMK00308 is a 3-GHz, 8-output differential clock buffer intended for high frequency, low additive jitter clock distribution and level translation. The EVM allows the user to verify the functionality and performance specifications of the device. Refer to the LMK00308 datasheet for the functional description and specifications. 2.
CONTENTS 1. General Description ................................................................................................... 1 2. Features ...................................................................................................................... 1 CONTENTS ........................................................................................................................ 2 LIST OF FIGURES .............................................................................................
LIST OF FIGURES Figure 1: LMK00308EVM Board Photo ........................................................................... 1 Figure 2: LMK00308 Evaluation Board Quick Start Setup ............................................ 4 Figure 3: Schematic Sheet #1 .......................................................................................... 9 Figure 4: Schematic Sheet #2 ........................................................................................ 10 Figure 5: Schematic Sheet #3 ...........
3. Quick Setup 50W TERM REFout (LVCMOS) To quickly set up and operate the board with basic equipment, refer to the setup procedure below and test setup shown in Figure 2.
Table 2: Input Selection Selected Input Default Input Mode S1[6] CLKin_Sel1 State S1[7] CLKin_Sel0 State CLKin0/0* CLKin1/1* OSCin Differential clock Differential clock 25 MHz XTAL onboard OFF OFF ON OFF ON Don’t care 4. Connect and measure any clock output SMA labeled CLKoutA#/A#*, CLKoutB#/B#*, or REFout to an oscilloscope or other test instrument using SMA cable(s). The output clock will be a level-translated/buffered copy of the selected clock input or crystal oscillator.
5. Power Supplies The power supply section on the EVM provides flexibility to power the device using the onboard regulator(s) or direct supply input(s). A combination of 0-ohm resistor options allows the user to modify the EVM power supply configuration, if desired. By default, 3.3 V is supplied to both VCC and VCCO rails by the onboard LDO regulator, U3.
in the output phase noise floor at low offset frequencies as well as low-level spurs. The high PSRR of the device helps to minimize supply-induced jitter. 6. Clock Inputs The SMA inputs labeled CLKin0 & CLKin0* and CLKin1 & CLKin1* can be configured to receive a differential clock or single-ended clock. Best performance is achieved with a differential input clock, which is the default configuration for both CLKin ports.
. Clock Outputs By default, Bank A outputs are configured for LVPECL mode, source-terminated with 160 ohm resistors, and AC coupled to the SMA connectors labeled CLKoutA#+ / CLKoutA#-. Bank B outputs are configured for LVDS and AC coupled to SMA connectors labeled CLKoutB#+ / CLKoutB#-. To modify the output interface for a different output mode, refer to the modifications noted in the Schematics section. REFout is a LVCMOS output and is AC coupled to its SMA connector.
. Schematics Figure 3: Schematic Sheet #1 March 2012 LMK00308EVM User’s Guide 9
Figure 4: Schematic Sheet #2 10 LMK00308EVM User’s Guide March 2012
Figure 5: Schematic Sheet #3 March 2012 11 LMK00308EVM User’s Guide
10.
Figure 7: Internal Ground Plane, Layer #2 (Layer Inverted, Not to scale) March 2012 13 LMK00308EVM User’s Guide
Figure 8: Internal Power Plane, Layer #3 (Not to scale) 14 LMK00308EVM User’s Guide March 2012
Figure 9: Bottom Side, Layer #4 (Top view, Not to scale) March 2012 15 LMK00308EVM User’s Guide
11.
# Designator 12 D1, D2 13 14 15 J1 J2 C7, C12, C14, C17, R1, R2, R3, R4, R5, R6, R7, R8, R18, R36, R41, R45, R46, R47, R48, R49, R50, R51, R52, R117, R122, R123, R128, R129 R24, R31 R34 R37, R132, R155, R156 R42 R53, R54, R55, R56, R57, R58, R59, R60 R133, R154 R135, R136, R137, R140, R141, R142, R143 R138 R139 R157 R158 R159 S1 SO1, SO2, SO3, SO4 16 17 18 19 20 21 22 23 24 25 26 27 28 29 Description LED 2.8X3.2MM 565NM GRN CLR SMD Qty SML-LX2832GC 2 Low Profile Vertical Header 2x5 0.
# Designator 38 R10, R11, R12, R13, R14, R15, R16, R17 R19, R118, R124, R130 DNP 0 DNP 0 R21, R23, R25, R26, R29, R30, R32, R35, R39, R40 R43, R44 R131, R134, R145, R153 DNP 0 DNP DNP 0 0 R146, R147, R148, R149, R150, R151, R152 Y2 DNP 0 DNP 0 39 40 41 42 43 44 18 Description LMK00308EVM User’s Guide Manufacturer Part Number Qty March 2012
EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
REGULATORY COMPLIANCE INFORMATION (continued) FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
【Important Notice for Users of this Product in Japan】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
NOTES
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.
