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參數(shù)資料
| 型號(hào)： | MT88L70 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | 3 Volt Integrated DTMF Receiver(3V 集成雙音多頻信號(hào)（DTMF）接收器) |
| 中文描述： | 3伏集成雙音多頻接收器（3V的集成雙音多頻信號(hào)（DTMF）的接收器） |
| 文件頁(yè)數(shù)： | 4/15頁(yè) |
| 文件大?。?/td> | 101K |
| 代理商： | MT88L70 |
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MT88L70
4-26
t
REC
=t
DP
+t
GTP
t
ID
=t
DA
+t
GTA
The value of t
DP
is a device parameter (see Figure 7)
and t
REC
is the minimum signal duration to be
recognized by the receiver. A value for C of 0.1
μ
F is
recommended for most applications, leaving R to be
selected by the designer.
Figure 3 - Basic Steering Circuit
Different steering arrangements may be used to
select independently the guard times for tone
present (t
GTP
) and tone absent (t
GTA
). This may be
necessary to meet system specifications which place
both accept and reject limits on both 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 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 4.
Power-down and Inhibit Mode
A logic high applied to pin 6 (PWDN) will power down
the device to minimize the power consumption in a
standby mode. It stops the oscillator and the
functions of the filters.
Inhibit mode is enabled by a logic high input to the
pin 5 (INH). It inhibits the detection of tones
representing characters A, B, C, and D. The output
code will remain the same as the previous detected
code (see Table 1).
Figure 4 - Guard Time Adjustment
Differential Input Configuration
The input arrangement of the MT88L70 provides a
differential-input operational amplifier as well as a
bias source (V
Ref
) which is used to bias the inputs at
mid-rail. Provision is made for connection of a
feedback resistor to the op-amp output (GS) for
adjustment of gain. In a single-ended configuration,
Figure 5 - Differential Input Configuration
C
v
c
V
DD
St/GT
ESt
StD
MT88L70
R
t
GTA
=(RC)In(V
DD
/V
TSt
)
t
GTP
=(RC)In[V
DD
/(V
DD
-V
TSt
)]
V
DD
V
DD
St/GT
ESt
R
1
C
1
R
2
V
DD
St/GT
ESt
C
1
R
1
R
2
a) decreasing t
GTP
; (t
GTP
< t
GTA
)
b) decreasing t
GTA
; (t
GTP
> t
GTA
)
t
GTA
=(R
1
C
1
) In (V
DD
/ V
TSt
)
t
GTP
=(R
P
C
1
) In [V
DD
/ (V
DD
-V
TSt
)]
R
P
= (R
1
R
2
) / (R
1
+ R
2
)
t
GTA
=(R
P
C
1
) In (V
DD
/ V
TSt
)
t
GTP
=(R
1
C
1
) In [V
DD
/ (V
DD
-V
TSt
)]
R
P
= (R
1
R
2
) / (R
1
+ R
2
)
C
1
R
1
C
2
R
4
IN+
IN-
R
5
R
2
R
3
GS
V
Ref
+
-
MT88L70
DIFFERNTIAL INPUT AMPLIFIER
C
1
= C
2
= 10 nF
R
1
= R
= R
= 100 k
R
2
= 60 k
, R
3
, = 37.5 k
R
3
=
R
2
+ R
5
R
2
R
5
VOLTAGE GAIN (A
V
diff) =
R5
R1
INPUT IMPEDANCE
(Z
INDIFF
) = 2
R
12
+
1
ω
C
2
All resistors are
±
1% tolerance.
All capacitors are
±
5% tolerance.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT88L70AC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:3 Volt Integrated DTMF Receiver |
| MT88L70AE | 制造商:Microsemi Corporation 功能描述: |
| MT88L70AE1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 3V 18PDIP - Rail/Tube |
| MT88L70AN | 制造商:Microsemi Corporation 功能描述: |
| MT88L70AN1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 3V 20SSOP - Rail/Tube 制造商:Microsemi Corporation 功能描述:IC 3V INTEGRATED DTMF RCVR |
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