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Silicon Laboratories extends bandwidth in SLIC chip

Posted: 18 Nov 2002 ?? ?Print Version ?Bookmark and Share

Keywords:silicon laboratories? si3216? wideband proslic? telephone ic? voice ic?

Silicon Laboratories has extended the filtered bandwidth in its latest subscriber line interface circuit, the Si3216 Wideband ProSLIC, enabling fuller fidelity for voice and other audio signals.

The ProSLIC expands the telephone filtered bandwidth from a range of 200Hz to 3.4kHz to a range of 50Hz to 7kHz. This enables a more natural and realistic sounding voice conversation, said product manager Scott George.

The ProSLIC is expected to be popular in Japan, where Nippon Telegraph and Telephone

Corp. is beginning to restructure traditional phone networks for IP, George said. The wideband SLIC would support VoIP transmission.

The Si3216 includes a dual-mode voice codec, which supports both traditional narrowband (200Hz 3.4kHz) and wideband (50Hz to 7kHz) encoding, ringers, tone generators, and impedance-matching line interfaces. The impedance control interface supports China's telephone systems (with 200- and 680-ohm, 100nF impedances), as well as Japan's (with 600-ohm, 1?F impedances).

The ringing loop in the ProSLIC, George points out, can be programmed for waveshape, amplitude, cadence, and frequency - and is designed to respond to signals on over 1.2Km of twisted pair cable. There are also built-in line monitoring and diagnostic features such as support for GR-909 line testing.

Its built-in dc/dc converter allows the device to run from 3.3- or 5V battery supplies, and to interface with a variety of power regulators, including MOSFETs, transformers, or BJTs.

Pricing for the Si3216 starts at $5.67 in quantities of 10,000, and evaluation boards are available for $150. Samples are available now and volume production will begin in Q1 of 2003.

- Stephan Ohr

EE Times





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