LMK04000BEVALXO National Semiconductor, LMK04000BEVALXO Datasheet - Page 21

• 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

The following table lists the test conditions used for the phase noise measurements for the crystal
oscillator option:
Table 7 . LMK040XX test conditions, XTAL Oscillator Option
Parameter
PLL1 Reference clock input
PLL1 Reference Clock frequency
PLL1 Phase detector frequency
PLL1 Charge Pump Gain
VCXO frequency
PLL2 phase detector frequency
PLL2 Charge Pump Gain
PLL2 REF2X mode
NOTE: All jitter measurements are for a 100 Hz to 20 MHz integration bandwidth.
The following plot illustrates the phase noise measured at F
CLKout2 (LVCMOS) using the XTAL oscillator option.
The phase noise and jitter performance at the clock outputs of the LMK040XX is strongly dependent on
the phase noise characteristics of the VCXO or crystal driving the OSCin
Figure 14. Typical Phase Noise Performance at F
-100
-110
-120
-130
-140
-150
-160
-170
-70
-80
-90
100
Resonator option. Jitter metrics are for an integration bandwidth of 100 Hz to 20 MHz.
Appendix B: Typical Phase Noise Performance Plots
L M K 0 4 0 X X
1000
LMK04021 Phase Noise, VCXO Freq = 12.288 MHz
E V A L U A T I O N
10000
Value
CLKin0*, single-ended, CLKin0 AC-coupled to GND
122.88 MHz
1024 kHz
100 uA
12.288 MHz, Ecliptek ECX-6465
12.288 MHz
3200 uA
disabled
Offset (Hz)
100000
out
21
, Fvco = 1474.56 MHz, Fcomp2 = 12.288 MHz. XTAL
B O A R D
OUT
O P E R A T I N G
Fout, 1475.56 MHz, Tj = 265 fs
LVDS Output, 122.88 MHz, Tj = 266 fs
LVPECL Output, 122.88 MHz, Tj = 273 fs
LVCMOS Output, 122.88 MHz, Tj = 256 fs
1000000
, CLKout0 (LVDS), CLKout1 (LVPECL), and
port.
10000000
I N S T R U C T I O N S
100000000