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參數(shù)資料
| 型號： | MT8843 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Calling Number Identification Circuit(主叫識別電路（提供各種主叫線信息傳遞設(shè)備的接口）) |
| 中文描述： | 主叫號碼識別電路（主叫識別電路（提供各種主叫線信息傳遞設(shè)備的接口）） |
| 文件頁數(shù)： | 4/26頁 |
| 文件大?。?/td> | 178K |
| 代理商： | MT8843 |
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MT8843
5-34
burst. The U.K.’s CCA specifies that data can be
transmitted in either format.
Bellcore
generic requirements for transmitting asynchronous
voiceband data to Customer Premises Equipment
(CPE). Another Bellcore specification SR-TSV-
002476 describes the same requirements from the
CPE’s perspective. The data transmission technique
specified in both documents is applicable in a variety
of services like Calling Number Delivery (CND),
Calling Name Delivery (CNAM) and Calling Identity
Delivery on Call Waiting (CIDCW) - services
promoted by Bellcore.
specification
GR-30-CORE
specifies
In CND/CNAM service, information about a calling
party is embedded in the silent interval between the
first and second ring burst. CNIC2 detects the first
ring burst and can then be setup to receive and
demodulate the incoming Bell-202 FSK data. The
device will output the demodulated data onto a 3-
wire serial interface.
In CIDCW service, information about an incoming
caller is sent to the subscriber, while they are
engaged in another call. A CPE Alerting Signal
(CAS) indicates the arrival of CIDCW information.
CNIC2 can detect the alert signal and then be setup
to demodulate incoming FSK data containing
CIDCW information.
Functional Description
Detection of CLIP/CID Call Arrival Indicators
The circuit in Figure 3 illustrates the relationship
between the TRIGin, TRIGRC and TRIGout signals.
Typically, the three pin combination is used to detect
an event indicated by an increase of the TRIGin
voltage from V
SS
to above the Schmitt trigger high
going
threshold
V
T+
characteristics).
(see
DC
electrical
Figure 3 shows a circuit to detect any one of three
CLIP/CID call arrival indicators: line reversal, ring
burst and ringing.
1. Line Reversal Detection
Line reversal, or polarity reversal on the A and B
wires indicates the arrival of an incoming CDS call,
as specified in SIN227. When the event (line
reversal) occurs, TRIGin rises past the high going
Schmitt threshold V
T+
and
normally high, is pulled low. When the event is over,
TRIGin falls back to below the low going Schmitt
threshold V
T-
and TRIGout returns high. The
components R5 and C3 (see figure 3) at TRIGRC
ensure a minimum TRIGout low interval.
TRIGout, which is
In a TE designed for CLIP, the TRIGout high to low
transition may be used to interrupt or wake-up the
microcontroller. The controller can thus be put into
Figure 3 - Circuit to Detect Line Reversal, Ring Burst and Ringing
Tip/A
C1=100nF
R1=499K
Ring/B
C2=100nF
R2=499K
MT8843
TRIGout
To Microcontroller
R3=200K
R
R
C
TRIGRC
TRIGin
4.5V<V
DD
< 5.5V
V1
V2
V3
V4
max V
T+
= 0.68 V
DD
min V
T+
= 0.48 V
DD
The application circuit must ensure that,
V
TRIGin
>max V
T+
where max V
T+
=3.74V @V
DD
=5.5V.
Tolerance to noise between A/B and V
SS
is:
max V
noise
= (min V
T+
)/0.30+0.7 =5.6Vrms @4.5V V
DD
where min V
T+
= 2.16V @V
DD
=4.5V.
Suggested R
5
C
3
component values:
R5 from 10K
to 500K
C3 from 47nF to 0.68
μ
F
An example is C3=220nF, R5=150K
; TRIGout low from
21.6ms to 37.6ms after TRIGin Signal stops triggering
the circuit.
Notes:
To determine values for C3 and R5:
R5C3=-t / ln(1-V
TRIGRC
/V
DD
)
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| MT8889CC-1 | Integrated DTMFTransceiver with Adaptive Micro Interface |
| MT8889CN-1 | Integrated DTMFTransceiver with Adaptive Micro Interface |
| MT8889CS-1 | Integrated DTMFTransceiver with Adaptive Micro Interface |
| MT8889C | Integrated DTMFTransceiver with Adaptive Micro Interface |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8843AE | 制造商:Mitel Networks Corporation 功能描述:TELEPHONE CALLING NO IDENT CKT, PDIP24 |
| MT8843AS | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS Calling Number Identification Circuit 2 Preliminary Information |
| MT8860 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:DTMF DECODER |
| MT8860XC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:DTMF DECODER |
| MT8860XE | 制造商:Hitachi 功能描述:DTMF RECEIVER, 18 Pin, Plastic, DIP 制造商:Microsemi Corporation 功能描述:DTMF RECEIVER, 18 Pin, Plastic, DIP 制造商:Mitel Networks Corporation 功能描述:DTMF RECEIVER, 18 Pin, Plastic, DIP |
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