Texas Instruments LMK04131 Clock Jitter Cleaner with Cascade PLL LMK04131EVAL/NOPB LMK04131EVAL/NOPB 数据表
产品代码
LMK04131EVAL/NOPB
L M K 0 4 1 X X - R E V 3 E V A L U A T I O N B O A R D O P E R A T I N G I N S T R U C T I O N S
SNLU099
6
Connector Name
Input/Output Description
CLKin0/CLKin0*,
CLKin1/CLKin1*
Input
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:
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:
AC Coupled Input Clock Voltage Levels
Input
Mode
Min
Max
Units
Differential
Bipolar
0.25
2.0
Vpp
Differential
MOS
0.25
2.0
Vpp
Single Ended
Bipolar
0.5
3.1
Vpp
Single Ended
MOS
0.5
3.1
Vpp
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.
LOS0, LOS1
Output
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.
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.
OSCin/OSCin*
Input
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.
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.