Norwood, Mass. - The latest member of the Mixed-Signal Front-End family at Analog Devices Inc. is intended to help makers of set-top boxes and cable modems differentiate their products. The AD9877 is a single-chip modem front-end interface that integrates a 232-MHz quadrature digital transmitter, a TxDAC digital-to-analog converter and a 12-bit direct IF analog-to-digital converter in the receive path, plus two 8-bit converters.
While the chip handles analog and mixed-signal processing in set-top boxes and cable modems, manufacturers can focus their design efforts on proprietary intellectual property for a digital ASIC.
The front-end device is based on a "smart-partitioning" design technique that divides up the signal path according to performance metrics rather than analog/digital boundaries, said Dave Robertson, product-line director for Analog Devices' high-speed converters group. Features include receiver IF sampling to 75 MHz and fine gain control in the transmit path (.5-dB steps from 0 to 7.5 dB).
The AD9877 is available now, priced at $4.53 in 100,000-piece quantities.
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EETInfo No. 620