Call Progress Tone Detector

7

MX633 - PRELIMINARY INFORMATION

© 1997 MX

•COM Inc.

www.mxcom.com Tele: 800 638-5577 910 744-5050

Fax: 910 744-5054

Doc. # 20480135.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

4.3.3 Control Logic

This block categorizes the nature of the signal into various decode output states and controls the two output pins.

See Table 3.

4.3.4 Xtal/Clock Oscillator

If the on-chip Xtal oscillator is to be used, then external components X1, R1, C1 and C2 are required. If an external clock

source is to be used, then it should be connected to the XTAL/CLOCK input pin and the XTAL pin should be left

unconnected.

4.4 Decode Output Truth Table

DETECT2

DETECT1

CONDITIONS

0

0

No Signal

0

1

Call Progress Low Band:

Will detect 350+440, 400+450, 440+480,400,

425, 440, and 450Hz tones

1

1

Call Progress High Band:

Will detect 480+620, 600 and 620Hz tones

1

0

Non Call Progress signal, e.g. voice activity

Note:

1.

DETECT1 responds to the entire range of call progress tones from 340Hz to 650Hz.

Table 3: Decode Output Truth Table

5. Performance Specification

5.1 Electrical Performance

5.1.1 Absolute Maximum Ratings

Exceeding these maximum ratings can result in damage to the device.

General

Min.

Max.

Units

–

0.3

7.0

V

–

0.3

V

Current

–

30

30

mA

–

30

30

mA

Any other pin

–

20

20

mA

DW / DIP Package

800

mW

Derating above 25°C

13

mW/°C above 25°C

Storage Temperature

–

55

125

°C

Operating Temperature

–

40

85

°C