AD8375 and AD8376 digitally-programmable VGAs provide 1-dB step size, high linearity for 2.5G, 3G, 4G, and WiMAX wireless base stations

Norwood, MA (03/12/2007) -
About the AD8375/AD8376
The AD8375 and AD8376 are high performance, fine-gain-step, digitally-controlled variable-gain amplifiers (VGAs) ideally suited for automatic gain control (AGC) within next-generation digital receivers for 2.5G, 3G, 4G, and WiMAX base stations. With the trend toward reducing size and increasing signal bandwidths within next-generation, multi-carrier base station designs, the AD8375 and AD8376 VGAs reduce component cost, board area, and power consumption—all while delivering unparalleled performance.

The AD8375 is a single-channel device, and the AD8376 is the industry’s first dual VGA. Both devices provide a highly integrated solution to replace discrete circuits comprising digital attenuators and intermediate frequency (IF) amplifiers required on a per channel basis within the IF signal path. Their 1-dB fine-gain-control steps and ±0.2-dB step accuracy allow designers to replace discrete implementations, representing an industry first for an integrated digitally-controlled VGA. The gain is controlled by a 5-bit digital interface over –4-dB to 20-dB range. The dual AD8376 provides two independent 5-bit digital interfaces and is ideally suited for use in main and diversity receiver designs.

Both the AD8375 and AD8376 provide unequalled linearity, with an output third-order intercept (OIP3) of 50 dBm at 140 MHz on just 130 mA current per channel. The high linearity minimizes distortion and eases design, allowing designers to maximize the signal level prior to the analog-to-digital converters (ADCs) across a broad choice of IFs up to 400 MHz. The AD8375 and AD8376 are for use with the most advanced high-performance ADCs such as ADI’s AD9640, AD9445 and the recently announced AD6655 diversity IF receiver.

The AD8375 and AD8376 simplify the IF signal path for next-generation base station receivers supporting the trend to multi-carrier wideband radio designs for W-CDMA, S3G/LTE, CDMA2000, TDS-SCDMA, GSM EDGE Evolution, and broadband WiMAX standards. The AD8375 and AD8376 support new multi-carrier radio receivers with higher data throughput and capacity enhancements, and are ideal for smaller, higher capacity 3G and 4G base stations.

Availability and Pricing
Fabricated on Analog Devices’ proprietary XF3 silicon on insulator (SOI) SiGe complementary bipolar process, the AD8375 and AD8376 are sampling now and will be available in full production quantities in June 2007. The single-channel AD8375 is priced at $4.49 per unit, and the dual AD8376 is priced at $6.49 per unit in 1,000-piece quantities. Both devices are packaged in small footprint LFCSP (lead-frame chip-scale packages); 24-lead for the AD8375 and 32-lead for the AD8376.

About Analog Devices
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 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.

Editor's Contact Information:

Linda Kincaid

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