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Zarlink chipset splits, tunes, processes RF cable signals

Posted: 09 Jan 2002 ?? ?Print Version ?Bookmark and Share

Keywords:zarlink? zarlink semiconductor? rf chipset? rf cable chipset? sl2150f?

The SL2150F/SL2101/SL2009 integrated chipset is designed for splitting, tuning and processing digital and analog RF cable signals. This chipset is said to lower cost of designing next-generation, multituner cable STBs by replacing more than 150 discrete front-end RF components with three high-performance, off-the-shelf ICs.

The chipset is comprised of the SL2150F front-end power splitter, the SL2101 broadband converter tuner and the SL2009 dual-stage IF amplifier. The three devices comply with CableLabs' DOCSIS 1.1 OpenCable standard and the U.S. FCC Part 15B EMI requirement.

The SL2150F power splitter features a simplified RF architecture. It offers a very wide dynamic operating range of 50MHz to 860MHz, four-channel power splitter and four buffered outputs. It also has a low-noise input preamplifier and independent AGC on each output, ensuring 25dB (min.) gain control across the input frequency range. The device interfaces with up to three SL2101 tuners and provides a bypass channel for the RF remodulator.

The SL2101 is a synthesized, double-conversion, up-down tuner that includes a bus-controlled PLL synthesizer, which delivers very low phase noise performance. It draws a maximum current of only 75mA. A patent-pending programmable feature allows power settings and inter-modulation performance to be customized within a single design implementation, making it suit different consumer applications.

The SL2009 IF amplifier has two stages of IF gain, both with independent AGC, which combine to deliver 34dB gain control. The first stage includes a level detector to control gain in the SL2150F. The amplifier is optimized to interface to standard SAW filters.

In 10,000-unit quantities, the SL2150F, in a miniature leadless QFP, is priced at $2.25; the SL2101, in a 28-pin SSOP, $1.68; and the SL2009, in a 16-pin SSOP, $1.25.

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