FX643 datasheet(13/14 Pages) CMLMICRO

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Call Progress Tone Detector

FX643

D/643/4

For the following conditions unless otherwise specified:

Xtal Frequency = 3.579545MHz, VDD = 3.3V to 5.0V, Tamb = - 40°C to +85°C, S/N = 20dB.

Notes

Min.

Typ.

Max.

Units

Signal Timings (ref. Figures 3, 4, 5 and 6)

Burst Length Ignored

Burst Length Detected

145

tGI

Call Progress Tone Gap Length Ignored

7,10,11

tGD

Call Progress Tone Gap Length Detected

7,10

tRP

Call Progress Tone Response Time

145

tDRP

Call Progress Tone De-response Time

145

tGDR

Gap Detected Recorded

8,10

tNG

Non Call Progress Signal Gap Length Ignored

tNRP

Non Call Progress Signal Response Time

145

tNDRP

Non Call Progress signal De-response Time

tCH

State Change

Notes:

Only applies to bursts of the same frequency.

To acknowledge a short tone gap

≥ 40 ms, No Signal is indicated for a minimum of 6ms.

If the gap > 90 ms, a No Signal state will be decoded.

10. Timings also apply to Special Information Tone.

11. Special Information Tone Gap Length Ignored is 15ms maximum.

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