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MAX3625A

Low-Jitter, Precision Clock Generator with Three Outputs

Maxim Integrated 

Low-Jitter, Precision Clock

Generator with Three Outputs

ELECTRICAL CHARACTERISTICS (continued)

(VCC = +3.0V to +3.6V, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise

noted.) (Notes 1, 2, 3)

PARAMETER

SYMBOL

CONDITIONS

REF_IN SPECIFICATIONS (Input DC- or AC-Coupled)

Reference Clock Frequency

PLL enabled

PLL bypassed

Input-Voltage High

VIH

Input-Voltage Low

VIL

Input High Current

IIH

VIN = VCC

Input Low Current

Reference Clock Duty Cycle

IIL

VIN = 0V

PLL enabled

Input Capacitance

CLOCK OUTPUT AC SPECIFICATIONS

VCO Frequency Range

Random Jitter (Note 6)

RJRMS

12kHz to 20MHz

1.875MHz to 20MHz

MIN TYP MAX UNITS

24.8

27.0

320

MHz

2.0

V

0.8

V

240

μA

-240

μA

30

70

%

2.5

pF

620

648

MHz

0.36

0.14

1.0

psRMS

Deterministic Jitter Induced by

Power-Supply Noise

(Notes 6, 7, and 8)

5.6

psP-P

Spurs Induced by Power-Supply

Noise

(Notes 6, 8, and 9)

-54

dBc

Nonharmonic and Subharmonic

Spurs

-70

dBc

Output Skew

Between any output pair

5

ps

f = 1kHz

-124

Clock Output SSB Phase Noise

at 125MHz (Note 10)

f = 10kHz

f = 100kHz

f = 1MHz

-127

-131

-145

dBc/H z

f > 10MHz

-153

Note 1: A series resistor of up to 10.5Ω is allowed between VCC and VCCA for filtering supply noise when system power-supply

tolerance is VCC = 3.3V ±5%. See Figure 1.

Note 2: LVPECL outputs guaranteed up to 320MHz.

Note 3: Measured using setup shown in Figure 1.

Note 4: All outputs enabled and unloaded.

Note 5: Measured with a crystal (see Table 4) or an AC-coupled, 50% duty-cycle signal on REF_IN.

Note 6: Measured with crystal source, see Table 4.

Note 7: Measured with Agilent DSO81304A 40GS/s real-time oscilloscope.

Note 8: Measured with 40mVP-P, 100kHz sinusoidal signal on the supply.

Note 9: Measured at 156.25MHz output.

Note 10: Measured with 25MHz crystal or 25MHz reference clock at REF_IN with a slew rate of 0.5V/ns or greater.

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