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Dual differential ADC drivers deliver low noise, low harmonic distortion

Norwood, Mass. — Analog Devices Inc. said it has introduced the industry's first dual differential analog-to-digital converter (ADC) drivers. The ADA4937-2 and ADA4938-2 devices deliver enhanced ADC characteristics to improve system performance of data acquisition systems in industrial and communications applications.

Designed for high-performance ADCs operating from dc to 100 MHz, the ADA4937-2 and ADA4938-2 differential drivers offer low noise and low distortion levels required to drive the high-speed ADCs found in today's wireless infrastructure and instrumentation
equipment. Suitable for single 3-V to 5-V power supplies, the ADA4937-2 achieves a distortion of -120/-102 dBc at 10 MHz, -98/-100 dBc at 40 MHz and -84/-90 dBc at 70 MHz. The ADA4938-2 operates over a 5-V to 10-V supply range and achieves a distortion of -112/-108 dBc at 10 MHz, -96/-93 dBc at 30 MHz and -79/-81 dBc at 50 MHz in dual supply applications.

Featuring an internal common-mode feedback architecture, the differential drivers allow the output common-mode voltage to be controlled by an externally applied voltage. This function bridges any gap between the output range of the component before the ADC and the input range of the ADC, eliminating the need for ac coupling and making the
drivers well suited for dc-coupled applications such as data acquisition instruments and baseband communications systems.

The devices are packaged in a Pb-free 4 x 4-mm, 24-lead LFCSP (lead-frame chip-scale package) and are specified to operate over the -40°C to +105°C temperature range for 3.3-V supplies and the -40°C to +85°C temperature range for 5-V supplies.

Pricing: $5.69 per unit in quantities of 1,000.
Availability: Sampling now with full production scheduled for October 2007.
Product information: ADA4937-2 and ADA4938-2

Analog Devices Inc. , 1-800-ANALOGD (1-800-262 5643), www.analog.com

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