LMK04800 datasheet(39/79 Pages) NSC

39 / 79 page

L M K 0 4 8 X X

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

VCXO Phase Noise

-170

-160

-150

-140

-130

-120

-110

-100

-90

-80

-70

-60

-50

100

1000

10000

100000

1000000 10000000

1E+08

Offset (Hz)

CVHD-950-122.88

Figure 15: Crystek CVHD-950-122.88 MHz VCXO Phase Noise at 122.88 MHz

Table 12: VCXO Phase Noise

at 122.88 MHz (dBc/Hz)

Offset

Phase

Noise

10 Hz

-76.6

100 Hz

-108.9

1 kHz

-137.4

10 kHz

-153.3

100 kHz

-162.0

1 MHz

-165.7

10 MHz

-168.1

40 MHz

-168.1

Table 13: VCXO RMS Jitter

to high offset of 20 MHz

at 122.88 MHz (rms fs)

Low

Offset

Jitter

10 Hz

515.4

100 Hz

60.5

1 kHz

36.2

10 kHz

35.0

100 kHz

34.5

1 MHz

32.9

10 MHz

22.7

Clock Output Measurement Technique

The same technique was used to measure phase noise for all three output types available on the

programmable OSCout and CLKout buffers. This was achieved by terminating one side of the

LVPECL, LVDS, or LVCMOS output with a 50-ohm load, and measuring the other side single-

ended using an Agilent E5052B Source Signal Analyzer.

Buffered OSCout Phase Noise

Both OSCout0 and OSCout1 frequencies are 122.88 MHz since the OSCout Divider is bypassed.

OSCout0 is programmed to LVCMOS mode and OSCout1 is fixed as LVPECL.

LMK04800 Datasheet(PDF) 39 Page - National Semiconductor (TI)

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