User’s Guide March 2012 LMK00304EVM User’s Guide 1. General Description This user guide describes how to set up and operate the LMK00304 evaluation module (EVM). The LMK00304 is a 3-GHz, 4-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 LMK00304 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: LMK00304EVM Board Photo ........................................................................... 1 Figure 2: LMK00304 Evaluation Board Quick Start Setup ............................................ 4 Figure 3: Schematic Sheet #1 .......................................................................................... 9 Figure 4: Schematic Sheet #2 ........................................................................................ 10 Figure 5: Schematic Sheet #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[7] CLKin_Sel1 State S1[6] CLKin_Sel0 State CLKin0/0* CLKin1/1* OSCin Differential clock Differential clock 25 MHz XTAL onboard OFF OFF ON OFF ON Don’t care Note: The silkscreen labels for S1[7:6] have been overwritten on the top side of the board to reflect the correct input selection states in Table 2. 4.
By default, 3.3 V is supplied to both VCC and VCCO rails by the onboard LDO regulator, U3. To power the regulator, connect a 4 V – 6 V input voltage and ground from an external power source to the terminal block, J2, or SMA input labeled VCC_EXT. To modify the EVM with a different power supply configuration, populate the resistor options as shown in Table 5. Then, apply the appropriate voltage(s) to the EVM power input(s). If the EVM is configured for dual direct supplies, connect the 3.
. 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. Both CLKin0 and CLKin1 paths include footprint options to provide the user with flexibility in configuring the termination, biasing, and coupling for the device inputs. 7.1.
9. Clock Outputs By default, Bank A and Bank B outputs are configured for LVPECL mode, and are source-terminated with 160 ohm resistors and AC coupled to the SMA connectors labeled CLKoutA#+ / CLKoutA#- and 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.
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Figure 4: Schematic Sheet #2 10 LMK00304EVM User’s Guide March 2012
Figure 5: Schematic Sheet #3 March 2012 11 LMK00304EVM User’s Guide
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Figure 8: Internal Power Plane, Layer #3 (Not to scale) Figure 9: Bottom Side, Layer #4 (Top view, Not to scale) March 2012 13 LMK00304EVM User’s Guide
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# Designator 15 C7, C12, C14, C17, R1, R2, R3, R4, R18, R36, R41, R45, R46, R47, R48, R117, R122, R123, R128, R129 R10, R11, R12, R13, R53, R54, R55, R56 R24, R31 R34 R37, R132, R155, R156 RES, 0 ohm, 5%, 0.063W, 0402 Panasonic ERJ-2GE0R00X 20 RES, 160 ohm, 5%, 0.063W, 0402 Vishay-Dale CRCW0402160RJNED 8 RES, 100 ohm, 1%, 0.063W, 0402 RES, 1.0k ohm, 5%, 0.1W, 0603 RES, 0 ohm, 5%, 0.
# Designator Description Manufacturer Part Number Qty 40 R131, R134, R145, R153 DNP 0 41 R147, R148, R149, R150, R151 DNP 0 .
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.
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