參數(shù)資料
型號(hào)： MT8889CC
廠商： Mitel Networks Corporation
英文描述： Integrated DTMFTransceiver with Adaptive Micro Interface
中文描述： 綜合DTMFTransceiver自適應(yīng)微型接口
文件頁(yè)數(shù)： 5/18頁(yè)
文件大?。?/td> 356K
代理商： MT8889CC
MT8889C/MT8889C-1
4-111
applications, leaving R1 to be selected by the
designer. Different steering arrangements may be
used to select independent tone present (t
GTP
) and
tone absent (t
GTA
) guard times. This may be
necessary to meet system specifications which place
both accept and reject limits on tone duration and
interdigital pause. Guard time adjustment also allows
the designer to tailor system parameters such as talk
off and noise immunity.
Increasing t
REC
improves talk-off performance since
it reduces the probability that tones simulated by
speech will maintain a valid signal condition long
enough to be registered. Alternatively, a relatively
short t
REC
with a long t
DO
would be appropriate for
extremely noisy environments where fast acquisition
time and immunity to tone drop-outs are required.
Design information for guard time adjustment is
shown in Figure 6. The receiver timing is shown in
Figure 7 with a description of the events in Figure 9.
Call Progress Filter
A call progress mode, using the MT8889C/
MT8889C-1, can be selected allowing the detection
of various tones, which identify the progress of a
telephone call on the network. The call progress
tone input and DTMF input are common, however,
call progress tones can only be detected when CP
mode has been selected. DTMF signals cannot be
detected if CP mode has been selected (see Table
7). Figure 8 indicates the useful detect bandwidth of
the call progress filter. Frequencies presented to the
input, which are within the ‘a(chǎn)ccept’ bandwidth limits
of the filter, are hard-limited by a high gain
comparator with the IRQ/CP pin serving as the
output. The squarewave output obtained from the
schmitt trigger can be analyzed by a microprocessor
or counter arrangement to determine the nature of
the call progress tone being detected. Frequencies
which are in the ‘reject’ area will not be detected and
consequently the IRQ/CP pin will remain low.
Figure 8 - Call Progress Response
AAAA
AAAA
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AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AAAA
AA
AA
AA
AA
LEVEL
(dBm)
FREQUENCY (Hz)
-25
0
250
500
750
= Reject
= May Accept
= Accept
Figure 7 - Receiver Timing Diagram
V
in
ESt
St/GT
RX
0
-RX
3
b3
b2
Read
Status
Register
IRQ/CP
EVENTS
A
B
C
D
E
F
t
REC
t
REC
t
ID
t
DO
TONE #n
TONE
#n + 1
TONE
#n + 1
t
DP
t
DA
t
GTP
t
GTA
t
PStRX
t
PStb3
DECODED TONE # (n-1)
# n
# (n + 1)
V
TSt
相關(guān)PDF資料
PDF描述
MT8889CE Integrated DTMFTransceiver with Adaptive Micro Interface
MT8889CN Integrated DTMFTransceiver with Adaptive Micro Interface
MT8889CS Integrated DTMFTransceiver with Adaptive Micro Interface
MT8889CE-1 Integrated DTMFTransceiver with Adaptive Micro Interface
MT8889C Integrated DTMF Transceiver with Adaptive Micro Interface(雙音多頻信號(hào)（DTMF）收發(fā)器（帶自適應(yīng)微接口）)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT8889CC-1 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Adaptive Micro Interface
MT8889CE 制造商:Microsemi Corporation 功能描述:
MT8889CE1 制造商:Microsemi Corporation 功能描述: 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 20PDIP - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 20PDIP 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 20PDIP
MT8889CE-1 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Adaptive Micro Interface
MT8889CN 制造商:Microsemi Corporation 功能描述:
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