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CMX644A

Description
V.22 and Bell 212A Modem
File Size1MB,34 Pages
ManufacturerCML Microcircuits
Websitehttp://www.cmlmicro.com/
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CMX644A Overview

V.22 and Bell 212A Modem

CMX644A
V.22 and Bell 212A
Modem
D/644A/6 June 2000
Provisional Issue
Features
V.22/Bell 212A Compatible Modem
Integrated DTMF Encoder
Call Progress/Accurate Answer Tone Detection
Line Reversal and Ringing Detector
Low Power Operation (2.7V)
Fully Integrated UART Functions
Applications
Telephone Telemetry Systems
Remote Utility Meter Reading
Security Systems/Cash Terminals
Industrial Control Systems
Pay-Phones
Cable TV Set-Top Boxes
1.1
Brief Description
The CMX644A V.22 modem is intended for use in any telephone based information and telemetry system with
low power requirements. Using V.22 signalling, fast call set up times and robust error resistant transmission
can be implemented by efficient low power circuits. The circuit can operate at 1200b/s full duplex over 2-or 4-
wire circuits. Control of the device is via a simple high speed serial bus and data may be optionally formatted
by the on-chip UART. This allows easy interfacing to a host µController. The data transmitted and received
by the modem is also transferred over the same high speed serial bus. In addition to V.22, support is included
to meet the Bell 212A standard. The integrated DTMF encoder can be used as part of the dial out function.
All 16 DTMF combinations are available along with a single tone ‘melody’ mode.
The answer tone generator/detector and call progress tone detectors included on the CMX644A make the set-
up of a telephone call a simple matter for the host µController.
In many data collection and telemetry systems low power consumption is important. The CMX644A features a
‘Zero Power’ standby mode. Whilst in standby, the device can still detect a ringing voltage or line voltage
reversal. The CMX644A can operate on a supply voltage between 3.0V and 5.5V across the full temperature
range of -40°C to +85°C. A low impedance pull down output is provided for a hook relay. The CMX644A is
pin compatible with the CMX624 V23/Bell 202 modem also from CML.
©
2000
Consumer Microcircuits Limited

CMX644A Related Products

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Description V.22 and Bell 212A Modem V.22 and Bell 212A Modem V.22 and Bell 212A Modem
Is it Rohs certified? - conform to conform to
Parts packaging code - SOIC SSOP
package instruction - SOIC-24 SSOP-24
Contacts - 24 24
Reach Compliance Code - compli compli
Other features - FULL DUPLEX FULL DUPLEX
JESD-30 code - R-PDSO-G24 R-PDSO-G24
JESD-609 code - e3 e3
length - 15.365 mm 8.205 mm
Number of functions - 1 1
Number of terminals - 24 24
Maximum operating temperature - 85 °C 85 °C
Minimum operating temperature - -40 °C -40 °C
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY
encapsulated code - SOP SSOP
Encapsulate equivalent code - SOP24,.4 SSOP24,.3
Package shape - RECTANGULAR RECTANGULAR
Package form - SMALL OUTLINE SMALL OUTLINE, SHRINK PITCH
Certification status - Not Qualified Not Qualified
Maximum seat height - 2.67 mm 2 mm
Maximum slew rate - 4 mA 4 mA
Nominal supply voltage - 3 V 3 V
surface mount - YES YES
technology - CMOS CMOS
Telecom integrated circuit types - MODEM MODEM
Temperature level - INDUSTRIAL INDUSTRIAL
Terminal surface - Matte Tin (Sn) Matte Tin (Sn)
Terminal form - GULL WING GULL WING
Terminal pitch - 1.27 mm 0.65 mm
Terminal location - DUAL DUAL
width - 7.425 mm 7.62 mm
Base Number Matches - 1 1
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