Call Progress Tone Detector
FX643
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.
70
Units
Signal Timings (ref. Figures 3, 4, 5 and 6)
tI
Burst Length Ignored
10
10
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
tL
Burst Length Detected
145
40
tGI
Call Progress Tone Gap Length Ignored
Call Progress Tone Gap Length Detected
Call Progress Tone Response Time
Call Progress Tone De-response Time
Gap Detected Recorded
7,10,11
7,10
10
20
tGD
tRP
tDRP
tGDR
tNG
tNRP
tNDRP
tCH
145
145
10
8,10
9
6
145
0
Non Call Progress Signal Gap Length Ignored
Non Call Progress Signal Response Time
Non Call Progress signal De-response Time
State Change
80
80
Notes:
7. Only applies to bursts of the same frequency.
8. To acknowledge a short tone gap ³ 40 ms, No Signal is indicated for a minimum of 6ms.
9. 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.
ã 1996 Consumer Microcircuits Limited
13
D/643/4
CMLMICRO [ CML MICROCIRCUITS ]
