MAX3625 Просмотр технического описания (PDF) - Maxim Integrated

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MAX3625

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)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

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

IIL

VIN = 0V

Reference Clock Duty Cycle

PLL enabled

Input Capacitance

CLOCK OUTPUT AC SPECIFICATIONS

VCO Frequency Range

24.8

27.0

MHz

320

2.0

V

0.8

V

240

μA

-240

μA

30

70

%

2.5

pF

620

648

MHz

Random Jitter (Note 6)

12kHz to 20MHz

RJRMS 1.875MHz to 20MHz

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: All outputs enabled and unloaded.

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

Note 5: Measured using setup shown in Figure 1.

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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