Analog crosspoint switches boost bandwidth

Santa Clara, Calif. — National Semiconductor Corp. claims these 16 x 8 analog crosspoint devices are the industry's fastest switches for high-resolution professional, broadcast and industrial video applications.

The fully buffered, non-blocking switches were designed on National's proprietary VIP10 process. By offering the highest bandwidth and lowest crosstalk performance, these devices can give systems a 25 percent to 50 percent boost in bandwidth compared to competitive products, the company said. This allows video designers to extend video resolution to QXGA (2048 x 1536) and beyond.

The LMH6582 and LMH6583 switches come in fixed gain of 1 and gain of 2 versions, respectively. Both versions provide a -3 dB bandwidth of 500 MHz and 0.1 dB gain flatness out to 100 MHz. Slew rates up to 3000 volts/microsecond ensure that bandwidth is maintained over a wide range of signal amplitudes. Designers can increase picture resolution in various wideband video applications including wideband routers, matrix switchers, security/surveillance systems and video distribution. In addition, the low channel-to-channel crosstalk of -50 dBc at 100 MHz is said to increase picture clarity by minimizing video artifacts and shadows from adjacent channels. Each buffered output can drive up to two back-terminated, 75-ohm video loads.

The inputs and outputs of the LMH6582 and LMH6583 feature high-impedance inactive states, making expansion to larger arrays easy, according to National. Symmetry has been designed into the pin arrangement, allowing doubling of inputs or outputs without the performance degradation normally associated with multi-chip expansion.

See related art

Samples and evaluation boards of the LMH6582 and LMH6583 are available now in 64-pin thermally enhanced TQFP packages. Both devices are priced at $39.95 in 100-unit quantities. Click here for the LMH6582/LMH6583 data sheets.

National Semiconductor Corp. , 1-800-272-9959,

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