Low-power v.32bis modem IC.
The CMX869 V.32bis modem IC has been added to CML Microcircuits' portfolio of low-power wireline telecom data products. With a maximum speed of 14,400 b/s, this product is suitable for the requirements of most mid-range telephone data applications, particularly those that are governed by low-power limitations. To provide the required fallback modes for V.32bis schemes and to allow the flexibility of "old-to-new" system migration in OEM products, the CMX869 offers V.32bis: V.32 and V.22bis (QAM), V.22 (DPSK) and V.23, V.21 and Bell equivalent (FSK) modulation schemes. Data rate re-train and re-negotiation operations on V.32bis/V.32 and V.22bit/V.22 systems can be catered for by the IC's selectable automodem facility. Control of and communication with this IC is via a simple, low-overhead serial interface and independent V.14 USART functions with HDLC options. The CMX869 has on-chip, versatile signaling facilities to provide 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. The modem requires, typically, 7 mA from a 3.3V supply, and it is available in 24-pin plastic small outline and dual in-line packages. CML Microcircuits, Oval Park, Langford, Essex, UK CM9 6WG; (+44) 1621 875500; Fax: (+44) 1621 875600; email@example.com;
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