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參數(shù)資料
| 型號： | MT8885 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Integrated DTMF Transceiver with Power Down and Adaptive Micro Interface(雙音多頻信號（DTMF）收發(fā)器（帶電源關閉和自適應微接口）) |
| 中文描述： | 集成雙音多頻收發(fā)器的斷電和自適應微型接口（雙音多頻信號（DTMF）的收發(fā)器（帶電源關閉和自適應微接口）） |
| 文件頁數(shù)： | 5/25頁 |
| 文件大?。?/td> | 190K |
| 代理商： | MT8885 |
Preliminary Information
MT8885
4-55
signal duration to be recognized by the receiver. A
value for C1 of 0.1
μ
F is recommended for most
Figure 6 - Guard Time Adjustment
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 MT8885, can be
selected to allow 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.
V
DD
St/GT
ESt
V
DD
St/GT
ESt
C1
R1
R2
C1
R1
R2
t
GTA
= (R1C1) In (V
DD
/V
TSt
)
R
P
= (R1R2) / (R1 + R2)
t
GTP
= (R
P
C1) In [V
DD
/ (V
DD
-V
TSt
)]
t
GTA
= (R
p
C1) In (V
DD
/V
TSt
)
R
P
= (R1R2) / (R1 + R2)
t
GTP
= (R1C1) In [V
DD
/ (V
DD
-V
TSt
)]
a) decreasing tGTP; (tGTP < tGTA)
b) decreasing tGTA; (tGTP > tGTA)
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PDF資料 |
PDF描述 |
|---|---|
| MT8888CE-1 | Integrated DTMFTransceiver with Intel Micro Interface |
| MT8888CN-1 | CB 3C 3#16S SKT RECP WALL |
| MT8888CS-1 | Integrated DTMFTransceiver with Intel Micro Interface |
| MT8888C | Integrated DTMFTransceiver with Intel Micro Interface |
| MT8888CC | Integrated DTMFTransceiver with Intel Micro Interface |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MT8885AE | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface |
| MT8885AE1 | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24PDIP - 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 |
| MT8885AN | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24SSOP - Rail/Tube |
| MT8885AN1 | 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 5V 24SSOP - Rail/Tube |
| MT8885ANR | 制造商:Microsemi Corporation 功能描述: |
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