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參數資料
| 型號： | MT8840AS |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | ISO2-CMOS Data Over Voice Modem |
| 中文描述： | ISO2全CMOS數據超過語音調制解調器 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 56K |
| 代理商： | MT8840AS |
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
utilizing switched-capacitor techniques.
technology
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 |
|---|---|
| MT884 | () |
| MT8860 | DTMF DECODER |
| MT8860XC | DTMF DECODER |
| MT8860XE | DTMF DECODER |
| MT8865 | DTMF Filter |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| 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 |
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