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參數資料
| 型號： | MT8840 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Data Over Voice Modem(載波話音調解解調器) |
| 中文描述： | 數據超過語音調制解調器（載波話音調解解調器） |
| 文件頁數： | 1/12頁 |
| 文件大小： | 65K |
| 代理商： | MT8840 |
5-3
MT8840
Data Over Voice Modem
Features
Performs ASK (amplitude shift keyed)
modulation and demodulation
32 kHz carrier frequency
Up to 2 kbit/s full duplex data transfer rate
On-chip oscillator
On-chip tone caller for alerting functions
Adjustable tone caller frequencies
Selectable self-loop test mode
5V/2.5mA power supply
ISO
2
-CMOS and switched capacitor
technologies
18 Pin DIP
Applications
Simultaneous data and voice communication in
PABXs
2 kbit/s data modem
"Smart" telephone sets
Description
The MT8840 is a carrier over voice modem which
allows simultaneous transfer of voice and data over a
single pair of wires. Data is transferred on an
amplitude shift keyed (ASK) 32 kHz carrier. On-chip
filters remove voice frequency signals from the
received composite voice and data signal prior to
demodulation. The modulating signal is a bit stream
with a typical data rate of 2 kbit/s. In addition, the
device contains a two tone warbler which functions
as a telephone ringer. The device is fabricated in
MITEL’s double-poly ISO
2
-CMOS technology utilizing
switched-capacitor techniques.
Ordering Information
MT8840AE
18 Pin Plastic DIP
MT8840AS
18 Pin SOIC
0
°
C to +85
°
C
Figure 1 - Functional Block Diagram
OSC1
OSC2
CK32
ETC MTC FATC
TxDI
RxDO
DET
CRx
V
DD
V
SS
V
Ref
LOOP
TCO
TxO
RxE
RxI
Timing
and
Control
Tone
Caller
Modulator
TX Bandpass
Filter
TX Post-
Filter
RX Pre-
Filter
R
O
U
T
I
N
G
AGC
RX Bandpass
Filter
Demodulator
ISSUE 4
November 1990
ISO
2
-CMOS
相關PDF資料 |
PDF描述 |
|---|---|
| MT8841 | CMOS Calling Number Identification Circuit |
| MT8841AE | CMOS Calling Number Identification Circuit |
| MT8841AN | CMOS Calling Number Identification Circuit |
| MT8841AS | CMOS Calling Number Identification Circuit |
| MT8841 | 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）) |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MT8840-1 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Data Over Voice Modem |
| MT8840AE | 制造商:Rochester Electronics LLC 功能描述: 制造商:MITEL / ZARLINK 功能描述: 制造商:Zarlink Semiconductor Inc 功能描述: |
| MT8840AS | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO2-CMOS Data Over Voice Modem |
| MT8841 | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:CMOS Calling Number Identification Circuit |
| MT8841AE | 制造商:Mitel Networks Corporation 功能描述:CALLER NUMBER ID CIRCUIT, 16 Pin, Plastic, DIP |
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