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CMX644AD2

Bell 212A and V.22 Modem with Call Progress and DTMF

MX-COM Inc  

DATA BULLETIN

CMX644A

Bell 212A and V.22 Modem

with Call Progress and DTMF

Features

• Bell 212A and V.22 Compatible Modem

• 1200bps Full Duplex Operation (2 or 4 Wire)

• UART for Start/Parity/Stop bit processing

• Non-UART Operating Mode

• Software Adjustable Tx and Rx Levels

• Programmable Group Delay Equalizer

• Answer/Originate Tone Generator/Detector

• Call Progress Tone Detection

• Integrated DTMF Encoder

• Line Reversal and Ring Detector

• Hook Switch Relay Driver

• Flexible Xtal/Master Clock Selection

PRELIMINARY INFORMATION

• Simple Serial Control Interface

• Zero-Power Standby Mode

• 3.0V to 5.0V Operation

Applications

• Telephone Telemetry Systems

• Remote Utility Meter Reading

• Security Systems

• Payphones

• Cable-TV Set-Top Boxes

• Industrial Control Systems

• Electronic Cash Terminals

• Vending Machines

XTAL/CLK

XTAL

SERIAL CLK

COMMAND

REPLY

CS

IRQ

Scrambler

PSK

Modulator

Tx

Filter

Tx

Programmable

Equalizer

UART

Serial

Interface

Oscillator

Clocks

Tx Data

Control &

Data Registers

Tone

Generator 1

S

Tone

Generator 2

Rx

Filter

Local Digital

Loopback

Rx Data

Registers

Carrier,

Call Progress,

Answer Tone

Detectors

Unscrambler

PSK

Demodulator

Registers

Rx

Programmable

Equalizer

VBIAS

TXIN-

TX+

TX-

TX

Local

Analog

Loopback

RX-

RX+

PASSIVE 2 or 4

HYBRID Wire Line

NETWORK

RXAMPOUT

Ring & Line

Reversal

Detect

RD

RT

RLYDRV

The CMX644A Bell 212A / V.22 modem provides full duplex 1200bps data signaling suitable for telephone-

based information and telemetry systems where low power operation is desired. Bell 212A / V.22 signaling

delivers fast-call set-up times and robust, error resistant, transmission in 2- or 4-wire line circuits. A rich set of

important additional functions enhances end product value while reducing size. These include: integrated

DTMF encoder for dial out functions, single tone encoder for ‘melody’ generation, answer tone

generator/detector, line reversal and ring detector for ‘waking’ up a sleeping µC, adjustable Tx and Rx gain,

and a low impedance pull down output for hook relay control. The addition of the answer tone

generator/detector and call progress tone detector makes the set-up of a telephone call much easier for the

host µC to accomplish.

Very low power telemetry and data collection applications are supported by the CMX644A’s ‘Zero Power’

standby mode in which the device will detect telephone line ringing voltage or line voltage reversal events.

The CMX644A is pin compatible with the CMX624 Bell 202 / V.23 modem, operates with a supply voltage

between 3.0V and 5.5V and is available in the following packages: 24-pin SSOP (CMX644AD5), 24-pin SOIC

(CMX644AD2), and 24-pin PDIP (CMX644AP4).

2000 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480197.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.

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