LMK04000BEVALXO National Semiconductor, LMK04000BEVALXO Datasheet - Page 15

• Manufacturer Part Number: LMK04000BEVALXO
• Description: BOARD EVAL PREC CLOCK PLL XO
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMK04000BEVALXO

• Main Purpose: Timing, Clock Conditioner
• Embedded: No
• Utilized Ic / Part: LMK04000
• Primary Attributes: 122.88 MHz Crystal
• Secondary Attributes: Integrated PLL & VCO
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Connector Name
CLKin0/CLKin0*,
CLKin1/CLKin1*
OSCin/OSCin*
LOS0, LOS1
L M K 0 4 0 X X - R E V 3
Input/Output Description
Output
Input
Input
E V A L U A T I O N
Populated connectors.
Reference clock inputs for PLL1. The default board
configuration is setup for a single-ended reference source
at CLKin0* (CLKin0 pin is AC-coupled to ground). The
mode of the clock input buffer is programmable in
CodeLoader on the Bits/Pins tab, and may be either bi-
polar junction mode or MOS mode.
The input level for the various modes is as in the datasheet:
If a DC-coupled clock is used to drive either of the inputs,
the high voltage level must be at least 2 volts and the low
voltage no greater than 0.4 volts.
By default CLKin0 is the active input in either of the auto-
switching modes (CLKin0 non-revertive, CLKin0
revertive). When loss of CLKin0 is detected, the device
automatically switches to CLKin1 if an active reference
clock is attached. See datasheet for further explanation.
Unpopulated connectors.
Loss-of-Signal indicator (when LOS_TYPE = Active
CMOS, default) for CLKin0/0* and CLKin1/1*. The
LEDs D5 and D3 are light red when no signal is detected
according to the datasheet specification for LOS pins.
Bits/Pins, LOS_TYPE = Active CMOS for default
operation.
Populated connectors.
By altering the PCB an external VCXO may be attached to
the OSCin/OSCin* SMA connectors. Either a differential
or single-ended device may be used. If a single-end device
is used, OSCin* should be tied to GND through a capacitor
that matches the AC-coupling capacitor value used for the
OSCin pin. See datasheet for OSCin port signal
specifications.
AC Coupled Input Clock Voltage Levels
Single Ended
Single Ended
Differential
Differential
Input
15
B O A R D
Bipolar
Bipolar
Mode
MOS
MOS
O P E R A T I N G
Min
0.25
0.25
0.5
0.5
I N S T R U C T I O N S
Max
2.0
2.0
3.1
3.1
Units
Vpp
Vpp
Vpp
Vpp