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參數(shù)資料
| 型號： | MT8870DE-1 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | ISO2-CMOS Integrated DTMF Receiver |
| 中文描述： | ISO2 - CMOS集成雙音多頻接收器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 215K |
| 代理商： | MT8870DE-1 |
MT8870D/MT8870D-1
ISO
2
-CMOS
4-16
Applications
RECEIVER SYSTEM FOR BRITISH TELECOM
SPEC POR 1151
The circuit shown in Fig. 9 illustrates the use of
MT8870D-1 device in a typical receiver system. BT
Spec defines the input signals less than -34 dBm as
the non-operate level. This condition can be
attained by choosing a suitable values of R
1
and R
2
to provide 3 dB attenuation, such that -34 dBm input
signal will correspond to -37 dBm at the gain setting
pin GS of MT8870D-1. As shown in the diagram, the
component values of R
3
and C
2
are the guard time
requirements when the total component tolerance is
6%. For better performance, it is recommended to
use the non-symmetric guard time circuit in Fig. 8.
Figure 8 - Non-Symmetric Guard Time Circuit
t
GTP
=(R
P
C
1
)In[V
DD
/(V
DD
-V
TSt
)]
t
GTA
=(R
1
C
1
)In(V
DD
/V
TSt
)
R
P
=(R
1
R
2
)/(R
1
+R
2
)
V
DD
St/GT
ESt
C
1
R
2
R
1
Notes:
R
1
=368K
±
1%
R
2
=2.2M
±
1%
C
1
=100nF
±
5%
Figure 9 - Single-Ended Input Configuration for BT or CEPT Spec
IN+
IN-
GS
V
Ref
INH
PWDN
OSC 1
OSC 2
V
SS
TOE
V
DD
St/GT
ESt
StD
Q4
Q3
Q2
Q1
DTMF
Input
C
1
R
1
R
2
X
1
V
DD
C
2
R
3
MT8870D-1
NOTES:
R
1
= 102K
±
1%
R
2
= 71.5K
±
1%
R
3
= 390K
±
1 %
C
1
,C
2
= 100 nF
±
5%
X
1
= 3.579545 MHz
±
0.1%
V
DD
= 5.0V
±
5%
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8870DN-1 | ISO2-CMOS Integrated DTMF Receiver |
| MT8870D | Integrated DTMF Receiver(完全雙音多頻信號（DTMF）接收器（集成了濾波器和數(shù)字譯碼器功能）) |
| MT8870D-1 | Integrated DTMF Receiver(完全雙音多頻信號（DTMF）接收器（集成了濾波器和數(shù)字譯碼器功能）) |
| MT8870 | () |
| MT8880C | ISO2-CMOS Integrated DTMFTransceiver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8870DE1-1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 5V 18PDIP - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:DTMF RX 3.58MHZ CMOS 5V 18PDIP - Rail/Tube |
| MT8870DN | 制造商:Microsemi Corporation 功能描述: |
| MT8870DN1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 5V 20SSOP - Rail/Tube |
| MT8870DN-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Integrated DTMF Receiver |
| MT8870DNR1 | 制造商:Microsemi Corporation 功能描述:DTMF RX 3.58MHZ CMOS 5V 20SSOP - Tape and Reel 制造商:Microsemi Corporation 功能描述:Pb Free Integrated DTMF RCVR |
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