Call Progress Tone Detector

MX643 - Preliminary Information

© 1996 MX•COM, INC.

Tele: 800 638 5577, 910 744 5050, Fax: 910 744 5054

Doc. #20480148.001

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DETECT 1

DETECT 2

DETECT 3

XTAL/CLOCK

indeterminate signal

valid signal

t = the time at which XTAL/CLOCK becomes stable

S

Figure 7: Timing Diagram: DETECT1, DETECT2, and DETECT3 Response time when ENABLE is high

DETECT 2

DETECT 1

DETECT 3

5V

0V

SIT

SIT

SIT

SINGLE TONE

VOICE

VOICE

NOT DRAWN TO SCALE

5V

0V

5V

0V

Figure 8: MX643 Frequency Sweep Results