MX643DW データシートの表示（PDF） - MX-COM Inc
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MX643DW Datasheet PDF : 12 Pages
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Call Progress Tone Detector
9
MX643 - Preliminary Information
Timing Characteristics
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.
Timing (ref. Figures 3, 4, 5 and 6)
Notes Min. Typ.
tI
tL
tGI
tGD
tRP
tDRP
tGDR
tNG
tNRP
tDNRP
tCH
tV
Burst Length Ignored
1
Burst Length Detected
1
145
Call Progress Tone Gap Length Ignored
1, 2
Call Progress Tone Gap Length Detected
1, 2
40
Call Progress Tone Response Time
1
Call Progress Tone De-response Time
1
Gap Detected Recorded
1, 3
6
Non Call Progress Signal Gap Length Ignored
4
Non Call Progress Signal Response Time
145
Non Call Progress signal De-response Time
State Change
0
DETECT1, DETECT2, and DETECT3 Response
5
Time
Max.
70
20
145
145
80
80
145
Units
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
Timing Notes:
1. Timings also apply to Special Information Tone.
2. Only applies to bursts of the same frequency.
3. To acknowledge a short tone gap ≥ 40 ms, No Signal is indicated for a minimum of 6ms.
4. If the gap > 90 ms, a No Signal state will be decoded.
5. Time between a stable XTAL/CLK and a valid DETECT1, DETECT2, and DETECT3 state when
ENABLE is logic high..
Timing Diagrams
tI
tL
tGD
tGI
SIGIN
ENABLE
No Signal
Call Progress
Low Band
tRP
tDRP
Call Progress
High Band
tRP
Call Progress
High Band
tRP
tDRP
Call Progress
High Band
DETECT1
DETECT2
tGDR
DETECT3
Note: DETECT3 is logic high only when the Call Progress Signal, or the Non Call Progress Signal is a single frequency tone.
Figure 3: Timing Diagram: Call Progress Tone(s)
© 1996 MX•COM, INC.
Tele: 800 638 5577, 910 744 5050, Fax: 910 744 5054
Doc. #20480148.001
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