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參數(shù)資料
| 型號(hào)： | MT88E45 |
| 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(hào)碼識(shí)別電路2（4線CNIC2） |
| 文件頁數(shù)： | 10/30頁 |
| 文件大?。?/td> | 523K |
| 代理商： | MT88E45 |
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MT88E45
Data Sheet
10
Zarlink Semiconductor Inc.
Figure 5 - CAS Guard Time Circuit Operation
Tone present guard time (t
GP
) operation: In Figure 5 5 initially there is no CAS, EST is low so Q1 is off. C has been
fully charged applying 0 V to ST/GT so Q2 is on. When both tones are detected EST goes high and turns off Q2.
Because C has been fully charged (ST/GT=0V), the comparator output is low and Q1 stays off. With both Q1 and
Q2 off the high at EST discharges C through R1 and the ST/GT voltage increases from 0 V. When the voltage
exceeds the comparator threshold VTGt, which is typically 0.5 Vdd, the comparator output goes high; Q1 turns on
and accelerates the discharge of C (ST/GT goes quickly to Vdd); STD goes low to indicate that a valid CAS has
been received. If one or both tones disappeared before t
GP
has been reached (i.e. when ST/GT voltage is still below
VTGt), Q2 turns back on and charges C quickly to bring the ST/GT voltage back to 0 V. Then if EST goes high again
the t
GP
duration must start over.
Tone absent guard time (t
GA
) operation: In Figure 5 5 initially both tones have been detected for t
GP
so C is fully
discharged and ST/GT is at Vdd. While both tones continue to be detected EST stays high; ST/GT is at Vdd (the
comparator output is high); so Q1 is on and Q2 is off. When one or both tones stop EST goes low and turns off Q1.
Because C is fully discharged (ST/GT=Vdd), the comparator output is high and Q2 stays off. With both Q1 and Q2
off the low at EST charges C through Rp=(R1 || R2) and the ST/GT voltage falls towards 0V. When the voltage has
fallen below VTGt, the comparator output goes low. Since EST is also low Q2 turns on and accelerates the
charging of C so that ST/GT goes quickly to 0V. STD goes high to indicate that the CAS has ended. If EST goes
back to high before t
GA
has been reached (i.e. when ST/GT voltage is still above V
TGt
), Q1 turns back on and
discharges C quickly to bring the ST/GT voltage back to Vdd. Then if EST goes low again the t
GA
duration must start
over. To set t
GA
=0, set R2 to 0.
+
-
VTGt
EST
ST/GT
Vdd
DR
/
STD
Indicates STD in CAS
detection mode
= Vss
Both Tones Present
C
Q1
Q2
MT88E45B
Comparator
P
N
CAS
EST
ST/GT
STD
t
DP
t
DA
t
GA
t
GP
R1
R2
Rp=R1 || R2
t
ABS
t
REC
t
GP
=R1C ln [Vdd / (Vdd-VTGt)]
t
GA
=RpC ln Vdd - Vdiode (Rp/R2)
VTGt - Vdiode (Rp/R2)
Rp=R1 || R2
t
GA
=0 if R2=0
V
diode
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT88E45AS | 4-Wire Calling Number Identification Circuit 2(4-Wire CNIC2) |
| MAN6710 | 0.560-INCH SEVEN SEGMENT DISPLAYS |
| MAN8410 | 0.800-INCH SEVEN SEGMENT DISPLAYS |
| MAN6410 | 0.560-INCH SEVEN SEGMENT DISPLAYS |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT88E45AS | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:4-Wire Calling Number Identification Circuit 2(4-Wire CNIC2) |
| 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 |
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