參數(shù)資料
型號(hào)： MT88L85
廠商： Mitel Networks Corporation
英文描述： 3V Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
中文描述： 3V的集成DTMFTransceiver與掉電
文件頁(yè)數(shù)： 5/20頁(yè)
文件大?。?/td> 350K
代理商： MT88L85
Advance Information
MT88L85
4-75
signal duration to be recognized by the receiver. A
value for C1 of 0.1 μF is recommended for most
Figure 6 - Guard Time Adjustment
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)
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 MT88L85, 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.
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
MT88L85AE 3V Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
MT88L85AN 3V Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
MT88L85AP 3V Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
MT88L89 3V Integrated DTMFTransceiver with Adaptive Micro Interface
MT88L89AC 3V Integrated DTMFTransceiver with Adaptive Micro Interface
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT88L85AE 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:3V Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
MT88L85AE1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 3V 24PDIP - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC TXRX DTMF 3V 24PDIP 制造商:Microsemi Corporation 功能描述:IC TXRX DTMF 3V 24PDIP
MT88L85AN 制造商:Microsemi Corporation 功能描述:
MT88L85AN1 制造商:Microsemi Corporation 功能描述:DTMF TXRX 3.58MHZ CMOS 3V 24SSOP - Rail/Tube 制造商:Microsemi Corporation 功能描述:3V DTMF TRANSCEIVER
MT88L85ANR 制造商:Microsemi Corporation 功能描述:
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