LMK04000BEVAL/NOPB National Semiconductor, LMK04000BEVAL/NOPB Datasheet - Page 26

• Manufacturer Part Number: LMK04000BEVAL/NOPB
• Description: BOARD EVAL PRECISION CLOCK PLL
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMK04000BEVAL/NOPB

• Main Purpose: Timing, Clock Conditioner
• Embedded: No
• Utilized Ic / Part: LMK04000
• Primary Attributes: 122.88 MHz VCXO
• Secondary Attributes: Integrated PLL & VCO
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LMK04000BEVAL; LMK04000BEVAL

Vectron 12.288 MHz Crystal
The phase noise of the reference is masked by the phase noise of the crystal by using a narrow
loop bandwidth. The crystal sets the reference noise to PLL2. Figure 14 shows the typical open
loop phase noise performance of the VXB1-1127-12M288 Vectron Crystal.
Figure 14 - Vectron VXB1-1127-12M288 Crystal Phase Noise at 12.288 MHz
-100
-110
-120
-130
-140
-150
-160
-170
-50
-60
-70
-80
-90
Table 8 - VCXO Phase Noise
100
at 12.288 MHz (dBc/Hz)
100 kHz
Offset
100 Hz
10 kHz
1 MHz
5 MHz
L M K 0 4 0 X X - R E V 3
1 kHz
Phase
-111.6
-143.3
-151.6
-152.7
-152.8
-153.3
Noise
1000
Crystal Phase Noise
E V A L U A T I O N
10000
Offset (Hz)
26
B O A R D
100000
O P E R A T I N G
Table 9 - VCXO RMS Jitter
to high offset of 20 MHz
at 12.288 MHz (rms fs)
100 kHz
Offset
100 Hz
10 kHz
Low
1 MHz
1 kHz
1000000
VXB1-1127-12M288
I N S T R U C T I O N S
964.1
934.5
932.7
924.0
834.5
Jitter
10000000