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MT88L85 Datasheet(PDF) 5 Page - Mitel Networks Corporation

Part # MT88L85
Description  3V Integrated DTMFTransceiver with Power Down & Adaptive Micro Interface
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

MT88L85 Datasheet(HTML) 5 Page - Mitel Networks Corporation

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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
VDD
St/GT
ESt
VDD
St/GT
ESt
C1
R1
R2
C1
R1
R2
tGTA = (R1C1) In (VDD/VTSt)
tGTP = (RPC1) In [VDD / (VDD-VTSt)]
RP = (R1R2) / (R1 + R2)
tGTA = (RpC1) In (VDD/VTSt)
tGTP = (R1C1) In [VDD / (VDD-VTSt)]
RP = (R1R2) / (R1 + R2)
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 (tGTP) and
tone
absent (tGTA) 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 tREC 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 tREC with a long tDO 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
Vin
ESt
St/GT
RX0-RX3
b3
b2
Read
Status
Register
IRQ/CP
EVENTS
AB
C
D
E
F
tREC
tREC
tID
tDO
TONE #n
TONE
#n + 1
TONE
#n + 1
tDP
tDA
tGTP
tGTA
tPStRX
tPStb3
DECODED TONE # (n-1)
# n
# (n + 1)
VTSt


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