Epson C I - 4 5 Bedienungsanleitung PDF herunterladen (Seite 10)

1960 E. Grand Ave., 2

Floor,

El Segundo, California 90245

Phone: 310.955.5300

Fax: 310.955.5400

This circuit gives a 5V swing level to the crystal. Hence, usually this circuit supplies a high drive level to the crystal.

Also, there is one more problem in this circuit; that is, when the probe is attached to the input terminal of the 'B' inverter in

order to monitor the wave form, a short current passes through the probe due to the probe's input capacitance. The short

current creates shock in the crystal and it may damage the crystal. Therefore it might be difficult to evaluate the circuit and we

do not recommend the use of this circuit

5.2.Overtone oscillator circuit for AT crystals

The general circuit for the overtone oscillation with an AT crystal is as follows: However the construction of the

circuit and parameters may be changed due to

the IC characteristics, frequency, pattern layout

on the board, etc. It is usually difficult to keep

sufficient oscillation allowance (especially in the

case of a high frequency circuit due to be

frequency being dose to the devices speed limit.

The basic way to measure the drive level and

oscillation allowance is the same as in the

fundamental circuit but, we recommend that this

circuit is evaluated by SEIKO EPSON Corp.

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Epson C I - 4 5 Bedienungsanleitung Seite 10