MAX3627 Просмотр технического описания (PDF) - Maxim Integrated

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MAX3627

+3.3V, Low-Jitter, Precision Clock Generator with Multiple Outputs

Maxim Integrated 

+3.3V, Low-Jitter, Precision Clock

Generator with Multiple Outputs

Table 1. Crystal Selection Parameters

PARAMETER

SYMBOL

MIN

Crystal Oscillation Frequency

Shunt Capacitance

Load Capacitance

Equivalent Series Resistance (ESR)

Maximum Crystal Drive Level

fOSC

CO

CL

RS

TYP

MAX

25

7.0

18

50

300

UNITS

MHz

pF

pF

μW

The layout shown in Figure 5 gives approximately 2pF

of trace plus footprint capacitance per side of the crys-

tal (Y1). The dielectric material is FR4, and dielectric

thickness of the reference board is 15 mils. Using a

25MHz crystal and the capacitor values of C45 = 27pF

and C46 = 33pF, the measured output frequency accu-

racy is -1ppm at +25°C ambient temperature.

Crystal Selection

The crystal oscillator is designed to drive a fundamental

mode, AT-cut crystal resonator. See Table 1 for recom-

mended crystal specifications. See Figure 6 for external

capacitance connection.

Figure 5. Crystal Layout

27pF

CRYSTAL

(CL = 18pF)

33pF

X_IN

MAX3627

X_OUT

Figure 6. Crystal, Capacitors Connection

10 ______________________________________________________________________________________

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