Rainbow-electronics MAX3629 Manual do Utilizador descarregar pdf (Página 11)

MAX3629

+3.3V, Low-Jitter, Precision Clock Generator

with Multiple Outputs

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Table 1. Crystal Selection Parameters

C46 = 33pF, the measured output frequency accuracy

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

X_IN

X_OUT

27pF

33pF

CRYSTAL

= 18pF)

Figure 6. Crystal, Capacitors Connection

PARAMETER SYMBOL MIN TYP MAX UNITS

Crystal Oscillation Frequency f

OSC

25 MHz

Shunt Capacitance C

7.0 pF

Load Capacitance C

18 pF

Equivalent Series Resistance (ESR) R

50 

Maximum Crystal Drive Level 300 μW

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Rainbow-electronics MAX3629 Manual do Utilizador Página 11