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SLIC solution for VoIP gateway unveiled

Posted: 27 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:subscriber line? interface circuit? VoIP gateway?

Silicon Laboratories Inc. has revealed the integrated, cost-effective and power-efficient subscriber line interface circuit (SLIC) solution for voice-over-IP (VoIP) gateways. The Si3226x Dual ProSLIC family delivers small bill of materials and board area and the low power consumption, according to the company. It provides a solution for low-channel-count VoIP customer premises equipment (CPE) such as fiber to the home (FTTH) gateways, DSL integrated access devices and cable embedded multimedia terminal adaptors (EMTAs). It also offer high-channel-count products including multiple-dwelling-unit gateways and PBX systems, Silicon Labs added.

The Si3226x family is touted as the industry's first FXS solution containing an integrated level shifter/driver that allows a direct connection to a DC/DC converter's power transistor regardless of input voltage. This innovation eliminates the need for MOSFET pre-drive circuit required by competing SLIC designs, reducing the cost and footprint of a two-channel design by at least twelve external devices.

The Si3226x family minimizes total FXS system power consumption, requiring less than 55mW per channel when on-hook. This makes the Dual ProSLIC devices a suitable solution as telecommunication service providers and governments mandate more energy-efficient electronic products, stated the company. The on-chip intelligent DC/DC converters optimize energy efficiency by generating only the voltages needed in on-hook, off-hook and ringing states. Ultra-low power consumption makes it easier to meet green energy requirements such as the European Commission's Code of Conduct on Power Consumption for Broadband Equipment. It enables longer battery standby time in battery-backed designs and reduces heat dissipation, and eliminates the need for fans in multiline gateway designs, further reducing system cost.

The Si3226x family is designed to generate tracking batteries for lowest power consumption, as well as work with shared battery supplies such as fixed-rail, for low BOM cost. The integrated DC/DC controllers can be configured as either single-output tracking DC/DC converters for each SLIC channel or a single multi-rail DC/DC converter shared by two or more channels. This flexibility allows developers to use the same SLIC device for both low-power tracking designs and low-cost fixed-rail designs. Furthermore, Silicon Labs' tracking shared supply (TSS) capability reduces power consumption of two-channel shared-battery designs compared to competitive fixed-rail designs.

The company provides software and reference design support to accelerate time to market and simplify Si3226x-based designs. The ProSLIC API, a common software library for the entire ProSLIC portfolio, eliminates the need to develop system-specific software drivers for ProSLIC devices. To allow system designers to optimize the trade off between cost and power consumption, the Si3226x evaluation boards support multiple DC/DC converter options. Reference design hardware and software support is available from leading vendors of SoC solutions for VoIP gateway equipment.

Silicon Labs offers two versions of the Si3226x Dual ProSLIC devices: those that connect to standard PCM/SPI digital interfaces or optionally to Silicon Labs' three-wire Integrated Serial Interface (ISI). The Si32260/1 standard PCM/SPI devices are available in 8 x 8mm 60pin QFN package. Additionally, the Si32266/7/8/9 devices are available in a 6 x 8mm 50pin QFN package and use Silicon Labs' ISI to reduce the interconnect to selected VoIP broadband gateway SoC solutions from several major vendors. Si3226x family pricing begins at $5.3 in 10,000-unit quantities.

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