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Zarlink Semiconductor Inc.

Zarlink, ZL and the Zarlink Semiconductor logo are trademarks of Zarlink Semiconductor Inc.

Copyright 2003-2005, Zarlink Semiconductor Inc. All Rights Reserved.

Features

•

Central office quality DTMF transmitter/receiver

•

Low power consumption

•

High speed Intel micro interface

•

Adjustable guard time

•

Automatic tone burst mode

•

Call progress tone detection to -30 dBm

Applications

•

Credit card systems

•

Paging systems

•

Repeater systems/mobile radio

•

Interconnect dialers

•

Personal computers

Description

The MT8888C is a monolithic DTMF transceiver with

call progress filter. It is fabricated in CMOS technology

offering low power consumption and high reliability.

The receiver section is based upon the industry

standard MT8870 DTMF receiver while the transmitter

utilizes a switched capacitor D/A converter for low

distortion, high accuracy DTMF signalling. Internal

counters provide a burst mode such that tone bursts

can be transmitted with precise timing. A call progress

filter can be selected allowing a microprocessor to

analyze call progress tones.

The MT8888C utilizes an Intel micro interface, which

allows the device to be connected to a number of

popular microcontrollers with minimal external logic.

September 2005

Ordering Information

MT8888CE

20 Pin PDIP

Tubes

MT8888CS

20 Pin SOIC

Tubes

MT8888CN

24 Pin SSOP

Tubes

MT8888CP

28 Pin PLCC

Tubes

MT8888CE1

20 Pin PDIP*

Tubes

MT8888CS1

20 Pin SOIC*

Tubes

MT8888CN1

24 Pin SSOP*

Tubes

MT8888CP1

28 Pin PLCC*

Tubes

MT8888CPR

28 Pin PLCC

Tape & Reel

MT8888CSR

20 Pin SOIC

Tape & Reel

MT8888CSR1

20 Pin SOIC*

Tape & Reel

MT8888CPR1

28 Pin PLCC*

Tape & Reel

*Pb Free Matte Tin

-40

°C to +85°C

MT8888C

Integrated DTMF Transceiver

with Intel Micro Interface

Data Sheet

Figure 1 - Functional Block Diagram

TONE

IN+

IN-

GS

OSC1

OSC2

ESt

St/GT

D0

D1

D2

D3

IRQ/CP

RD

CS

WR

RS0

∑

D/A

Converters

Row and

Column

Counters

Transmit Data

Register

Data

Bus

Buffer

Tone Burst

Gating Cct.

+

-

Oscillator

Circuit

Bias

Circuit

Control

Logic

Digital

Algorithm

and Code

Converter

Control

Logic

Steering

Logic

Status

Register

Control

Register

A

Control

Register

B

Receive Data

Register

Interrupt

Logic

I/O

Control

Low Group

Filter

High Group

Filter

Dial

Tone

Filter