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參數(shù)資料
| 型號： | MT8843 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Calling Number Identification Circuit(主叫識別電路（提供各種主叫線信息傳遞設(shè)備的接口）) |
| 中文描述： | 主叫號碼識別電路（主叫識別電路（提供各種主叫線信息傳遞設(shè)備的接口）） |
| 文件頁數(shù)： | 7/26頁 |
| 文件大?。?/td> | 178K |
| 代理商： | MT8843 |
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MT8843
5-37
Figure 6 - Single-Ended Input
Configuration
Figure 7 - Differential Input Configuration
FSK Demodulation
CNIC2 first bandpass filters and then demodulates
the incoming FSK signal. The device’s carrier
detector provides an indication of the presence of
signal at the bandpass filter output. The CNIC2’s
dual mode 3-wire interface allows convenient
extraction of the 8-bit data words in the demodulated
FSK bit stream.
Note that signals such as dual tone alert signal,
speech and DTMF tones lie in the same frequency
band as FSK. They will, therefore, be demodulated
and as a result, false data will be generated. To avoid
demodulation of false data, an FSKen pin is provided
so that the FSK demodulator may be disabled when
FSK signal is not expected. There are two events
that if either is true, should be used to disable
FSKen. The events are CD returning high or
receiving all the data indicated by the message
length word.
The FSK characteristics described in Table 2 are listed
in BT and Bellcore specifications. The BT signal
frequencies correspond to CCITT V.23. The Bellcore
frequencies correspond to Bell 202. The U.K.’s CCA
requires that the TE be able to receive both CCITT
V.23 and Bell 202, as specified in the BT and Bellcore
specifications. CNIC2 is compatible with both formats
without any adjustment.
CNIC2 will meet these characteristics with its input
opamp at unity gain.
The MT8843 provides a powerful dual mode 3-wire
interface so that the 8-bit data words in the
demodulated FSK bit stream can be extracted
without the need either for an external UART or for
the TE/CPE’s microcontroller to perform the UART
function in software. The interface is specifically
3-wire User Interface
a. The signal power is expressed in dBm referenced to 600 ohm
at the CPE tip/ring (A/B) interface.
b. SR-3004,Issue 2, January 1995.
c. The frequency range is specified in GR-30-CORE.
d. Up to 20 marks may be inserted in specific places in a single
or multiple data message.
C
R
IN
IN+
IN-
GS
V
Ref
Voltage Gain
(A
V
) = R
F
/ R
IN
R
F
C1
R1
C2
R4
R3
R2
R5
IN+
IN-
GS
V
Ref
Differential Input Amplifier
C1 = C2
R1 = R4 (For unity gain R5= R4)
R3 = (R2R5) / (R2 + R5)
Voltage Gain
(A
V
diff) = R5/R1
Input Impedance
(Z
IN
diff) = 2
R1
2
+ (1/
ω
C)
2
Item
BT
Bellcore
Mark
frequency
(logic 1)
1300Hz
±
±1.5%
1200Hz
±
±1%
Space
frequency
(logic 0)
2100Hz
±
±1.5%
2200Hz
±
±1%
Received
signal level -
mark
-8dBV to
-40dBV
(-5.78dBm to
-37.78dBm)
-12dBm
a
to
-32dBm
Received
signal level -
space
-8dBV to
-40dBV
-12dBm to
-36dBm
Signal level
differential
(twist)
up to 6dB
up to 10dB
b
Unwanted
signals
<= -20dB
(300-3400Hz)
<= -25dB
(0-4kHz)
c
Transmission
rate
1200 baud
±
±1%
1200 baud
±
±1%
Word format
1 start bit (logic
0), 8 bit word
(LSB first), 1 to
10 stop bits
(logic 1)
Table 2 - FSK Characteristics
1 start bit (logic
0), 8 bit word
(LSB first),
1 stop bit
(logic 1)
d
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8843AE | 制造商:Mitel Networks Corporation 功能描述:TELEPHONE CALLING NO IDENT CKT, PDIP24 |
| MT8843AS | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS Calling Number Identification Circuit 2 Preliminary Information |
| MT8860 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:DTMF DECODER |
| MT8860XC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:DTMF DECODER |
| MT8860XE | 制造商:Hitachi 功能描述:DTMF RECEIVER, 18 Pin, Plastic, DIP 制造商:Microsemi Corporation 功能描述:DTMF RECEIVER, 18 Pin, Plastic, DIP 制造商:Mitel Networks Corporation 功能描述:DTMF RECEIVER, 18 Pin, Plastic, DIP |
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