參數(shù)資料
型號(hào)： MT88E45B
廠商： Zarlink Semiconductor Inc.
英文描述： 4-Wire Calling Number Identification Circuit 2
中文描述： 4線來(lái)電號(hào)碼識(shí)別電路2
文件頁(yè)數(shù)： 8/28頁(yè)
文件大小： 488K
代理商： MT88E45B
MT88E45B
Data Sheet
8
Tone present guard time (t
GP
) operation: In Figure 5
initially there is no CAS, EST is low so Q1 is off. C
has been fully charged applying 0V 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 0V. 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 0V. Then if EST goes high again the t
GP
duration must start over.
Tone absent guard time (t
GA
) operation: In Figure 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.
In Figure 5, t
DP
is the delay from the start of CAS to
EST responding, t
DA
is the delay from the end of CAS
to EST responding. The total delay from the start of
CAS to STD responding is t
REC
=t
DP
+t
GP.
The total
delay from the end of CAS to STD responding is
t
ABS
=t
DA
+t
GA
.
Figure 5 - CAS Guard Time Circuit Operation
+
-
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
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參數(shù)描述
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
MT88E45BS 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:4-Wire Calling Number Identification Circuit 2
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