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參數(shù)資料
| 型號： | MT88L85 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | 3V Integrated DTMF Transceiver with Power-Down and Adaptive Micro Interface(3V 集成雙音多頻信號（DTMF）接收器（帶電源關(guān)閉和自適應(yīng)微接口）) |
| 中文描述： | 3V的集成雙音多頻收發(fā)器關(guān)閉電源和自適應(yīng)微型接口（3V的集成雙音多頻信號（DTMF）的接收器（帶電源關(guān)閉和自適應(yīng)微接口）） |
| 文件頁數(shù)： | 5/25頁 |
| 文件大小： | 197K |
| 代理商： | MT88L85 |
MT88L85
4-75
Figure 5 - Basic Steering Circuit
Guard Time Adjustment
The simple steering circuit shown in Figure 5 is
adequate for most applications. Component values
are chosen according to the following inequalities
(see Figure 7):
t
REC
≥
t
DPmax
+ t
GTPmax
- t
DAmin
t
REC
≤
t
DPmin
+ t
GTPmin
- t
DAmax
t
ID
≥
t
DAmax
+ t
GTAmax
- t
DPmin
t
DO
≤
t
DAmin
+ t
GTAmin
- t
DPmax
The value of t
DP
is a device parameter (see AC
Electrical Characteristics) and t
REC
is the minimum
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
V
DD
V
DD
St/GT
ESt
C1
Vc
R1
MT88L85
t
GTA
= (R1C1) In (V
DD
/ V
TSt
)
t
GTP
= (R1C1) In [V
DD
/ (V
DD
-V
TSt
)]
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
)]
b) decreasing
t
GTA
;
(
t
GTP
>
t
GTA
)
a) decreasing
t
GTP
;
(
t
GTP
<
t
GTA
)
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
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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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