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參數資料
| 型號： | MT88L70AS |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | 3 Volt Integrated DTMF Receiver |
| 中文描述： | 3伏集成雙音多頻接收器 |
| 文件頁數： | 5/16頁 |
| 文件大?。?/td> | 474K |
| 代理商： | MT88L70AS |
MT88L70
Data Sheet
5
Zarlink Semiconductor Inc.
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
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
)
相關PDF資料 |
PDF描述 |
|---|---|
| MT88L70AN | 3 Volt Integrated DTMF Receiver |
| MT88L70AE | 3 Volt Integrated DTMF Receiver |
| MT88L70AC | 3 Volt Integrated DTMF Receiver |
| MT88L70 | 3 Volt Integrated DTMF Receiver |
| MT88L70 | 3 Volt Integrated DTMF Receiver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MT88L70AS1 | 制造商:Microsemi Corporation 功能描述:PB FREE 3V 8870 DTMF RECEIVER 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 3V 18SOIC - Rail/Tube 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC RECEIVER DTMF 18SOIC 制造商:Microsemi Corporation 功能描述:IC RECEIVER DTMF 18SOIC |
| MT88L70ASR | 制造商:Microsemi Corporation 功能描述: |
| MT88L70ASR1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 3V 18SOIC - Tape and Reel 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC RECEIVER DTMF 18SOIC 制造商:Microsemi Corporation 功能描述:IC RECEIVER DTMF 18SOIC |
| MT88L70AT | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:3 Volt Integrated DTMF Receiver |
| MT88L85 | 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 |
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