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FX633

Call Progress Tone Detector

CML Microsystems Plc 

Call Progress Tone Detector

1.7.1 Electrical Performance (continued)

FX633

Figure 5 Timing Diagram: Call Progress Tone(s) to Non Call Progress Signal

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.

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

tI

Burst Length Ignored

tL

Burst Length Detected

tGI

Call Progress Tone Gap Length Ignored

tGD

Call Progress Tone Gap Length Detected

tRP

tDRP

tGDR

tNG

Call Progress Tone Response Time

Call Progress Tone De-response Time

Gap Detected Recorded

Non Call Progress Signal Gap Length Ignored

tNRP

tDNRP

tCH

Non Call Progress Signal Response Time

Non Call Progress signal De-response Time

State Change

Notes Min. Typ. Max. Units

70

ms

145

ms

7

20

ms

7

40

ms

145 ms

145 ms

8

6

ms

9

80

ms

145

ms

80

ms

0

ms

Notes:

7. Only applies to bursts of the same frequency.

8. To acknowledge a short tone gap ≥ 40 ms, No Signal is indicated for a minimum of 6ms.

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

© 1996 Consumer Microcircuits Limited

11

D/633/3

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