- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384758 > MT8841 (Mitel Networks Corporation) Calling Number Identification Circuit(主叫識別電路（提供各種主叫線信息傳遞設備的接口）) PDF資料下載
參數(shù)資料
| 型號： | MT8841 |
| 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備的接口）） |
| 文件頁數(shù)： | 4/15頁 |
| 文件大?。?/td> | 96K |
| 代理商： | MT8841 |
MT8841
5-14
edge corresponds to the centre of each DATA bit cell
(providing the incoming baud rate matches the DCLK
rate). DCLK is not generated for the stop and start
bits. Consequently, DCLK will clock only valid data
into a peripheral device such as a serial to parallel
shift register or a micro-controller. The CNIC also
outputs an end of word pulse (data ready) at the DR
pin. The data ready signal indicates the reception of
every 10-bit word sent from the Central Office. This
output is typically used to interrupt a micro-controller.
The three outputs together, eliminate the need for a
UART
(Universal
Asynchronous
Transmitter) or the high software overhead of
performing the UART function (asynchronous serial
data reception).
Receiver
Note that the 3-pin interface may also output data
generated by voice since these frequencies are in
the input frequency detection band of the device.
The user may choose to ignore these outputs when
FSK data is not expected, or force the CNIC into its
powerdown mode.
Power Down Mode
For
consumption, the CNIC can be forced into power
down when it is not needed to receive FSK data. This
is done by pulling the PWDN pin high. In powerdown
mode, the crystal oscillator, op-amp and internal
circuitry are all disabled and the CNIC will not react
to the input signal. DATA and DCLK are at logic high,
and DR and CD are at high impedance or at logic
high when pulled up with resistors.The CNIC can be
awakened for reception of the FSK signal by pulling
the PWDN pin to ground (see Figure 9).
applications
requiring
reduced
power
Carrier Detect
The presence of the FSK signal is indicated by a
logic low at the carrier detect (CD) output. This
output has built in hysteresis to prevent toggling
when the received signal is shortly interrupted. Note
that the CD output is also activated by voice since
these frequencies are in the input frequency
detection band of the device. The user may choose
to ignore this output when FSK data is not expected,
or force the CNIC into its powerdown mode.
Figure 5 - Common Crystal Connection
Crystal Oscillator
The CNIC uses a crystal oscillator as the master
timing source for filters and the FSK demodulator.
The crystal specification is as follows:
Frequency:
Frequency tolerance:
Resonance mode:
Load capacitance:
Maximum series resistance: 150 ohms
Maximum drive level (mW): 2 mW
e.g. CTS MP036S
3.579545 MHz
±
0.1%(-40
°
C+85
°
C)
Parallel
18 pF
A number of MT8841 devices can be connected as
shown in Figure 5 such that only one crystal is
required. The connection between OSC2 and OSC1
can be D.C. coupled as shown, or A.C. coupled using
30pF capacitors. Alternatively, the OSC1 inputs on
all devices can be driven from a CMOS buffer (dc
coupled) with the OSC2 outputs left unconnected.
VRef and CAP Inputs
V
Ref
is the output of a low impedance voltage source
equal to V
DD/2
and is used to bias the input op-amp.
A 0.1
μ
F capacitor is required between CAP and V
SS
to suppress noise on V
Ref.
OSC1
OSC2
OSC1
OSC2
OSC1
OSC2
3.579545 MHz
MT8841
MT8841
MT8841
to the
next MT8841
相關PDF資料 |
PDF描述 |
|---|---|
| MT8843 | CMOS Calling Number Identification Circuit 2 Preliminary Information |
| MT8843AE | CMOS Calling Number Identification Circuit 2 Preliminary Information |
| MT8843AS | CMOS Calling Number Identification Circuit 2 Preliminary Information |
| MT8843 | Calling Number Identification Circuit(主叫識別電路（提供各種主叫線信息傳遞設備的接口）) |
| MT8888C | Integrated DTMF Transceiver with Intel Micro Interface(雙音多頻信號（DTMF）收發(fā)器（帶Intel微接口）) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MT8841AE | 制造商:Mitel Networks Corporation 功能描述:CALLER NUMBER ID CIRCUIT, 16 Pin, Plastic, DIP |
| MT8841AN | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS Calling Number Identification Circuit |
| MT8841AS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MT8843 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS Calling Number Identification Circuit 2 Preliminary Information |
| MT8843AE | 制造商:Mitel Networks Corporation 功能描述:TELEPHONE CALLING NO IDENT CKT, PDIP24 |
發(fā)布緊急采購，3分鐘左右您將得到回復。