LMK00308 Datasheet, PDF (15/25 Pages) Texas Instruments – 3-GHz 8-Output Differential Clock Buffer/Level Translator

LVDS Phase Noise @ 100 MHz (Note 26)
HCSL Phase Noise @ 100 MHz (Note 26)
30177696
Crystal Power Dissipation vs. R_LIM
(Note 27, Note 28)
200 _{20 MHz Crystal}
175 ^{40 MHz Crystal}
150
125
100
75
50
25
0
0 500 1k 1.5k 2k 2.5k 3k 3.5k 4k
RLIM (Ω)
30177631
30177697
LVDS Phase Noise in Crystal Mode
(Note 27, Note 28)
-60 _{20 MHz Crystal, Rlim = 1.5 kΩ}
40 MHz Crystal, Rlim = 1.0 kΩ
-80
-100
-120
-140
-160
-180
10
100 1k 10k 100k 1M 10M
OFFSET FREQUENCY (Hz)
30177632
Note 26: The typical RMS jitter values in the plots show the total output RMS jitter (J_OUT) for each output buffer type and the source clock RMS jitter (J_SOURCE).
From these values, the Additive RMS Jitter can be calculated as: J_ADD = SQRT(J_OUT2 - J_SOURCE2).
Note 27: 20 MHz crystal characteristics: Abracon ABL series, AT cut, C_L = 18 pF , C₀ = 4.4 pF measured (7 pF max), ESR = 8.5 Ω measured (40 Ω max), and
Drive Level = 1 mW max (100 µW typical).
Note 28: 40 MHz crystal characteristics: Abracon ABLS2 series, AT cut, C_L = 18 pF , C₀ = 5 pF measured (7 pF max), ESR = 5 Ω measured (40 Ω max), and
Drive Level = 1 mW max (100 µW typical).
15
www.ti.com