The AD9862 integrates four high-performance data converters on a mixed-signal front-end chip for broadband applications. The chip consists of two high-speed 12-bit analog-to-digital converters and two 14-bit 128-Msample/second digital-to-analog converters, along with communications-specific digital processing. The device is part of Analog Devices' Mixed-Signal Front-End family of ICs, which partition the signal path according to performance, rather than along analog-digital boundaries. The transmit path accepts a variety of data formats and includes dual-programmable gain amplifiers, 2x or 4x interpolation filters, a digital Hilbert filter and digital mixers. The receive path can accept diversity or I&Q data at baseband or low IF and has input buffers, programmable-gain amplifiers and decimation filters. Programmable delay-locked loop circuits are also included. Sampling now, the device comes in a 128-lead LQFP and is priced at $15.50 each per 100,000.
David Patterson, known for his pioneering research that led to RAID, clusters and more, is part of a team at UC Berkeley that recently made its RISC-V processor architecture an open source hardware offering. We talk with Patterson and one of his colleagues behind the effort about the opportunities they see, what new kinds of designs they hope to enable and what it means for today’s commercial processor giants such as Intel, ARM and Imagination Technologies.