Texas Instruments Clock Jitter Cleaner With Dual Cascaded PLLs and Integrated 1.9 GHz VCO LMK04803BEVAL/NOPB LMK04803BEVAL/NOPB Scheda Tecnica
Codici prodotto
LMK04803BEVAL/NOPB
November 2013
LMK040xx Evaluation Board User’s Guide
SNAU045A
5
Copyright © 2013, Texas Instruments Incorporated
www.ti.com
Basic Operation
1. Connect a low noise
3.3 V power supply to the VCC SMA connector. If there is no jumper between VccSMA and
VccAUXPlane, either install a jumper or connect a 3.3VDC supply to the VCCAux SMA Connector located at the
top left of the board.
2. Connect a low noise reference clock source (122.88 MHz for the XTAL option or 61.44 MHz VCXO option, 10
MHz for the 100 MHz VCXO option) to the CLKin0* SMA connector (CLKin0 may be left unconnected, as the
default configuration of the board uses a single-ended input for the reference). ***See note below:
***NOTE:
This is the default reference input. The power level of the reference input should be 6 dBm +/- 1 dBm for
best performance. The reference input to the LMK040XX is AC coupled so the reference source may be either AC or
DC biased. The default signal path configuration is singled-ended. Using a differential reference source requires
modification of the board. A sinusoidal or square signal may be used, though better performance may be obtained
with a higher slew rate on the input clock.