SM802117 查看數據表（PDF） - Micrel

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SM802117

ClockWorks™ GbE (125MHz) Ultra-Low Jitter, LVPECL Frequency Synthesizer

Micrel 

Micrel, Inc.

SM802117

AC Electrical Characteristics(4, 5)

VDD = VDDO1/2 = 3.3V ±5% or 2.5V ±5%

VDD = 3.3V ±5%, VDDO1/2 = 2.5V ±5%

TA = −40°C to +85°C. RL = 50Ω to VDDO − 2V

Symbol

Parameter

Condition

FOUT

Output Frequency

FREF

Reference Input Frequency

TR/TF

LVPECL Output Rise/Fall Time 20% – 80%

ODC

TSKEW

Output Duty Cycle

Output-to-Output Skew

Within bank. Note 6

TLOCK

PLL Lock Time

Tjit(∅)

RMS Phase Jitter(7)

125MHz

Integration Range (1.875MHz – 20MHz)

Integration Range (12kHz – 20MHz)

Spurious Noise Components

25MHz

Min.

80

48

Typ.

125

25

175

50

115

254

-85

Max.

350

52

45

20

Units

MHz

MHz

ps

%

ps

ms

fs

dBc

Notes:

5. All phase noise measurements were taken with an Agilent 5052B phase noise system.

6. Defined as skew between outputs at the same supply voltage and with equal load conditions and same frequency; Measured at the output

differential crossing points.

7. Measured using 25MHz crystal as the input reference source. If using an external reference input, use a low phase noise source. With an external

reference, the phase noise will follow the input source phase noise up to about 1MHz.

October 2011

6

M9999-101311-B

hbwhelp@micrel.com or (408) 955-1690

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