MT8840AE Просмотр технического описания (PDF) - Mitel Networks

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MT8840AE

ISO2-CMOS Data Over Voice Modem

Mitel Networks 

ISO2-CMOS 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

• ISO2-CMOS and switched capacitor

technologies

• 18 Pin DIP

Applications

• Simultaneous data and voice communication in

PABXs

• 2 kbit/s data modem

• "Smart" telephone sets

ISSUE 4

November 1990

Ordering Information

MT8840AE 18 Pin Plastic DIP

MT8840AS 18 Pin SOIC

0°C to +85°C

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 ISO2-CMOS technology

utilizing switched-capacitor techniques.

OSC1

OSC2

CK32

ETC MTC FATC

TxDI

RxDO

Timing

and

Control

Tone

Caller

Modulator

TX Bandpass

Filter

TX Post-

R

Filter

O

U

T

I

Demodulator

AGC

RX Bandpass

RX Pre-

N

Filter

Filter

G

TCO

TxO

RxE

RxI

DET

CRx

VDD

VSS

VRef

LOOP

Figure 1 - Functional Block Diagram

5-3

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