Product category:
Communications ICs (Wired)
News Release from: CML Microcircuits | Subject: CMX869A
Edited by the Electronicstalk Editorial
Team on 21 November 2005
Multistandard modem is versatile in EPOS
The CMX869A V.32 bis modem IC addresses the current "need for speed" in mid-range telephone data applications.
The CMX869A V.32 bis modem IC addresses the current "need for speed" in mid-range telephone data applications The latest addition to CML's extensive portfolio of low power wireline telecomms data products, provides a multistandard modem IC with manual connect, particularly addressing EPOS based systems
This article was originally published on Electronicstalk on 11 Feb 2004 at 8.00am (UK)
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The CMX981 is an extremely-low-power advanced digital-radio baseband processor, combined on-chip with a voice codec/processor and an audio PA.
With a maximum speed of 14,400bit/s, this compact, ultra-low-power telecomms product will meet the requirements of most data applications, especially those that have a need for speed but are governed by low-power limitations.
To provide the required fallback modes for V.32 bis schemes and to allow the flexibility of "old-to-new" system migration in OEM products, the CMX869A offers as well as V.32 bis: V.32 and V.22 bis (QAM), V.22 (DPSK) and V23, V.21 and Bell equivalent (FSK) modulation schemes.
Datarate retrain and renegotiation operations on V.32 bis/V.32 and V.22 bis/V.22 systems are catered for by the IC's selectable automodem facility.
Control and communication is via a simple, low-overhead serial interface and independent V.14 USART functions with HDLC options.
In addition to its modem operations, the CMX869A has on-chip, versatile signalling facilities providing all the functions required to set up, negotiate and carry out data transfers over two- or four-wire systems.
These include: Rx and Tx dual tones (DTMF) and preset and user programmable tone generators and receivers to address the requirements of such operations as call progress, ring tone, call and answer and guard tones.
On-chip ring detect, line reversal and hook-switch drive functions are common to most CML wireline data products.
Envisaged as a more versatile modem for new-generation EPOS terminals and many wireline data systems, the CMX869A requires, typically, 12mA from a 3.3V supply and is available in 24-pin plastic small SOIC, TSSOP and DIL packages.
Applications include: electronic point-of-sale and cash terminals; telephone telemetry including remote utility meter reading; and alarm, security and control systems.
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