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Line terminators deliver near-ideal performance

Posted: 31 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:tt electronics? line terminator? pfc hf? chc series?

TT Electronics IRC Advanced Film Division has developed a series of high-speed line terminators capable of operating at frequencies up to 40GHz, and providing near-ideal termination performance at 50 and 75? for high-frequency digital transmission lines.

Designed to terminate high-speed transmission lines in computer and communications busses and memory circuits, these new devices are available as discrete chips (PFC HF series) and in ceramic ball-grid array (BGA) network packages (CHC series). The high-frequency resistors have been characterized using time domain techniques more familiar to digital engineers, in addition to the traditional analog/RF frequency domain measurements, said the company, and exhibit extremely low parasitic inductance and capacitance.

The PFC HF series resistors feature ultra-stable TaNFilm tantalum nitride thin-film elements on ceramic chips in 0603 and 0805 chip sizes, in 50? and 75? ratings with resistance tolerances to 1 percent, and temperature coefficient of resistance (TCRs) values to 25ppm/C. When subjected to a digital signal with a 100ps rise time, signal reflection at the terminator is

The CHC series resistor networks are packaged in BGAs on ceramic substrates with a variety of isolated or bussed termination schematics in either 1mm pitch (3 x 9 or 4 x 9) or 0.65mm pitch (2 x 5, 4 x 8, or 4 x 10) arrays. When subjected to a digital signal with a 100ps rise time, the signal reflection at the CC0910B terminator is

Applications include termination circuits in high-speed routers and switches, as well as copper-to-fiber and fiber-to-copper data conversion circuits.

Typical pricing for the PFC-HF series starts at 45 cents ach in quantities of 2,500. Delivery is six to eight weeks. The CHC series is priced at $1.06 each in quantities of 5,000. Delivery is eight to ten weeks.

- Gina Roos

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