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參數(shù)資料
| 型號： | MT88E45AS |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | 4-Wire Calling Number Identification Circuit 2(4-Wire CNIC2) |
| 中文描述： | 4線來電號碼識別電路2（4線CNIC2） |
| 文件頁數(shù)： | 9/30頁 |
| 文件大?。?/td> | 523K |
| 代理商： | MT88E45AS |
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MT88E45
Data Sheet
9
Zarlink Semiconductor Inc.
Table 3 - CAS/DT-AS Characteristics
Table 3 shows the Hybrid op-amp (GS2) gain for operation at 3 V and 5 V nominal Vdd, with a
±
10% Vdd variation.
For 3 V operation, the Hybrid op-amp gain should be reduced from the 5 V setting to maintain the CAS reject level
and to maintain the talkoff immunity: the CAS threshold is directly proportional to Vdd, when Vdd is reduced the
threshold becomes lower, hence lower level CAS are accepted. If the gain is not reduced, the MT88E45B will be
more talkoff prone. In Table 3, the GS2 gain is shown as a range. By adopting the lower gain, talkoff immunity can
be improved.
When CAS detection is selected, the dual purpose output pin DR/STD is STD. STD goes low when CAS has been
detected, and returns high after CAS has ended.
CAS Guard Time
The guard time circuit shown in Figure 55 implements a timing algorithm which determines whether the signal is a
CAS. Proper selection of the guard time(s) is key to good speech immunity. The first indication that there might be a
CAS is when EST goes high. EST high indicates that both tones are present. EST low indicates that one or both
tones is not present. STD low indicates that CAS has been detected. When STD returns high it indicates that CAS
has ended.
The timing algorithm consists of 2 components: a tone present guard time (t
GP
) and a tone absent guard time (t
GA
).
t
GP
sets the minimum accept duration for CAS. That is, both tones must be detected continuously for t
GP
for STD to
go low to indicate that CAS has been detected. For STD to return high to indicate that CAS has ended, one or both
tones must have disappeared for t
GA
. The purpose of t
GA
is to bridge over momentary EST dropouts once EST has
met the minimum tone duration so as to decrease the likelihood of a long talkoff being broken up into several
talkoffs. Usually t
GA
is set very short or removed altogether because there is another way to deal with the problem
(by ignoring further detections for 2 seconds after every detection).
Duration
75 to 85 ms
75 to 85 ms
Off-hook: 80 to 85 ms
On-hook: 88 to 110 ms
Off-hook: <=70 ms
On-hook: <=20 ms
Off-hook: Speech
On-hook: >= 20 dB
(300-3400 Hz)
0 dB
Reject Duration
Signal to Noise Ratio
Speech
Speech
Hybrid Op-amp (GS2) Gain
Vdd = 5V +/- 10%
Hybrid Op-amp (GS2) Gain
Vdd = 3V +/- 10%
0 to -5 dB
0 to -5 dB
-3.5 to -8.5 dB
-3.5 to -8.5 dB
-3.5 dB
a. SR-TSV-002476, Issue 1 Dec 1992
b. ETS 300 778-2 Jan 98. The DT-AS plus FSK variant of ETSI on-hook signalling described in ETS 300 778-1 is not supported
because on-hook DT-AS uses the GS1 op-amp. With the GS1 gain in Table 4, the DT-AS minimum level will be below the
MT88E45B’s minimum accept level.
c. SIN227 Issue 3 Nov 97, SIN242 Issue 2 Nov 96
d. dBm - Decibels above or below a reference power of 1 mW into 600 ohms. 0 dBm = 0.7746 Vrms.
e. dBV - Decibels above or below a reference voltage of 1 Vrms. 0 dBV = 1 Vrms
2130 Hz and 2750 Hz
CAS/DT-AS Characteristics
Bellcore
a
(Off-hook only)
ETSI
b
(Off-hook)
BT
c
(Off-hook = ‘Loop State’)
(On-hook = ‘Idle State’)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MT88E45B | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:4-Wire Calling Number Identification Circuit 2 (4-Wire CNIC2) |
| MT88E45BN | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:4-Wire Calling Number Identification Circuit 2 |
| MT88E45BN1 | 制造商:Microsemi Corporation 功能描述:CALLER ID CMOS 3.58MHZ 3.3V 20SSOP - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC CNIC CIDCW CID 20SSOP 制造商:Microsemi Corporation 功能描述:IC CNIC CIDCW CID 20SSOP |
| MT88E45BNR | 制造商:Microsemi Corporation 功能描述:CALLER ID CMOS 3.58MHZ 3.3V 20SSOP - Tape and Reel |
| MT88E45BNR1 | 制造商:Microsemi Corporation 功能描述:CALLER ID CMOS 3.58MHZ 3.3V 20SSOP - Tape and Reel 制造商:Zarlink Semiconductor Inc 功能描述:CALLER ID CMOS 3.58MHZ 3.3V 20SSOP - Tape and Reel |
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