Analog Devices Improves Othello Radio for 3G TD-SCDMA Wireless Handset

Analog Devices, Inc. (NYSE: ADI), a global leader in high-performance semiconductors for signal processing applications, unveiled the latest addition to its award-winning family of Othello(R) direct conversion radios and its broad TD-SCDMA product portfolio, the Othello-3T AD6552. Expanding on the company’s legacy as a leading provider of solutions for TD-SCDMA wireless handsets, the Othello-3T AD6552 is ADI’s second-generation radio designed specifically for the 3G TD-SCDMA standard and complements all of the company’s TD-SCDMA baseband chipsets, including SoftFone-LCR and SoftFone-LCR+.

Based on the proven Othello direct-conversion architecture and a novel low-noise transmitter, the AD6552 simplifies the development of the radio section of 3G wireless handsets by eliminating the SAW (surface acoustic wave) filters that are usually needed in the transmit path, reducing both cost and board space. In addition, the receiver section provides EVM performance that supports the requirements for HSDPA and includes a fully-automatic dc offset control. In addition, the AD6552 integrates virtually all of the necessary components for a handset radio design (VCOs, tank circuits, loop filters and power management) all on a single chip. Component count for a dual-band radio is reduced by almost 40% compared to the previous two-chip Othello-W single-band radio for TD-SCDMA.

Analog Devices is the only single source supplier of complete chipset solutions for the TD-SCDMA standard and the company’s chipsets have been an integral part of the network trials in China over the past three years. Today, commercial TD-SCDMA networks are being deployed in 10 cities throughout China, with a total population estimated at more than 60 million, which is roughly equivalent to the entire population of the United Kingdom or France.

“Analog Devices is the only company to offer a complete solution for TD-SCDMA and has built a broad portfolio of solutions for the standard over the past few years,” said Christian Kermarrec, vice president, RF and wireless systems, Analog Devices Inc. “Today, with networks being built that can reach 60 million potential subscribers, TD-SCDMA interest is at an all-time high. The latest addition to our TD-SCDMA product family, Othello-3T AD6552, represents the industry’s most complete and highly-integrated radio for TD-SCDMA handsets, and will enable both domestic Chinese and global handset OEMs to speed time to market and gain a position in China’s emerging 3G market.”

About Analog Devices’ Othello-3T Transceiver
The Othello-3T AD6552 is part of Analog Devices family of direct-conversion RF transceivers. Othello was introduced as the first open-market direct conversion GSM radio in 1999 and the product family has since grown dramatically to support additional standards such as GPRS, EDGE, W-CDMA and TD-SCDMA. With Othello, a combination of patented circuit designs, architectures, and system knowledge were used to solve the historical problems associated with radio design such as self-detection, dc offset and VCO phase errors. Today, direct conversion has become the preferred approach for the design of wireless handset radios.

The Othello-3T AD6552 applies this same patented approach in a CMOS implementation and provides a complete transmit/receive solution for TD-SCDMA-based mobile terminals. The receiver section includes high-performance single-ended low-noise amplifiers (LNAs) covering the 1900 and 2000 MHz bands. A direct-down-converting quadrature mixer driven by an on-chip fractional-N PLL synthesizer deliver baseband I and Q (In-phase and Quadrature) signals to a variable-gain amplifier (VGA) and programmable low-pass filter stages with dc offset correction.

The transmitter section consists of a fractional PLL synthesizer, a high performance VGA and quadrature modulator driving a common wideband output stage, as well as a true-rms RF power detector and on-chip D/A converter (DAC) for power amplifier control.

Othello-3T AD6552 is sampling now in a 6 mm x 6 mm 40-lead lead-frame chip scale package.

About Analog Devices, Inc.
Innovation, performance, and excellence are the cultural pillars on which Analog Devices has built one of the longest standing, highest growth companies within the technology sector. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, Analog Devices serves over 60,000 customers, representing virtually all types of electronic equipment. Celebrating more than 40 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices’ common stock is listed on the New York Stock Exchange under the ticker “ADI” and is included in the S&P 500 Index.

Othello and SoftFone are registered trademarks of Analog Devices Inc.