AN2317 - Application

External Circuit Design

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External Clock (see

Figure 15)

The clock generator is powered from analog supply, and is responsible for two tasks:

a)

to retard the turning on of some of the function blocks after Power-on Reset (POR)

in order to help smooth start the external power supply circuitry and keep all major

loads off of the circuit, and

b)

to provide all necessary clocks for the analog and digital parts. Two nominal

frequency ranges are expected,(1) from 4.000MHz to 4.194MHz, or (2) from

8.000MHz to 8.192MHz.

Figure 15.

External Clock Source Recommended Connections

VSS

–

CLKIN CLKOUT

AI12917