Datasheet

4 LMK00306EVM User’s Guide March 2012
3. Quick Setup
To quickly set up and operate the board with basic equipment, refer to the setup procedure below and test
setup shown in Figure 2.
LMK0030x
EVALUATION
MODULE
CLKinX
CLKinX*
VCC_EXT
GND
Bank A Outputs
(LVPECL default)
REFout
(LVCMOS)
Bank B Outputs
(LVPECL default)
Bottom side:
25 MHz Crystal
(Default Input)
CLKoutBn
CLKoutBn*
CLKoutAn
CLKoutAn*
O-SCOPE
(50W inputs)
50W TERM
50W TERM
Note: Terminate unused
output traces (or disconnect
from output pin on PCB)
CLOCK
SOURCE
(OPTIONAL)
50W TERM
4-6 V
GND
POWER
SUPPLY
Figure 2: LMK00306 Evaluation Board Quick Start Setup
1. Verify the output mode control switches, S1[1:5], match the states shown in Table 1 to reflect the default
output clock interfaces configured on the EVM.
Table 1: Default Clock Output Modes
SW Position/Name
SW State
Default Clock Output Modes
S1[1] / CLKoutB_Type1
OFF
Bank B outputs are LVDS
S1[2] / CLKoutB_Type0
ON
S1[3] / CLKoutB_Type1
OFF
Bank A outputs are LVPECL
S1[4] / CLKoutB_Type0
OFF
S1[5] / REFout_EN
ON
REFout (CMOS) enabled
2. Connect a 4 – 6 V power supply to VCC_EXT and GND terminals of the power block labeled J2. This powers
the on-board LDO regulator to supply 3.3 V to the VCC and VCCO rails of the IC. Both VCC & VCCO status
LEDs should be lit green when ON.
3. Set the desired clock input using the input selection control switches, S1[6:7], per Table 2. The onboard 25
MHz crystal (Y1) can be selected, so an external clock source is not required. A differential clock source can
be connected to SMAs labeled CLKin0/0* or CLKin1/1*. By default, these differential inputs are AC coupled
and terminated near the device with 100 ohms differential. To configure the EVM for a single-ended input,
refer to the Clock Inputs section.