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ADC differential drivers tout 'lowest' distortion

Posted: 27 Feb 2007 ?? ?Print Version ?Bookmark and Share

Keywords:ADC? differential amplifier? differential driver? ADI? ADC driver?

Differential ADC drivers from ADI

Analog Devices Inc. has extended its family of differential amplifiers with the introduction of two new devices said to have distortion levels 10dB lower than competing driver ICs. The ADA4937-1 and ADA4938-1 differential drivers are optimized for driving high-performance ADCs from DC to 100MHz. For example, the ADA4937-1 has 16bit performance up to 40MHz, 14bit performance up to 70MHz and 12bit performance up to 100MHz.

In applications such as wireless infrastructure equipment, the improved ADC performance translates into higher data rates with fewer errors. When used in DAQ systems, the new driver ICs allow the ADCs to provide more accurate data collection at faster speeds, resulting in higher system throughout and overall performance.

Improved system performance
"Lower distortion levels allow designers to maintain the quality of key ADC performance characteristics, including spurious-free dynamic range and SNR, leading directly to improved system performance," said Jim Doscher, product line director for high-speed linear products at ADI. "The drivers also make it very easy to level shift the signal to match the input range of the ADC without AC coupling, preventing the loss of low-frequency information."

The ADA4937-1 and ADA4938-1 ADC drivers combine the low noise and distortion levels required to drive the high-speed ADCs found in today's wireless infrastructure and instrumentation equipment. Suitable for single 3V to 5V power supplies, the ADA4937-1 achieves distortion of -120/-102dBc at 10MHz, -98/-100dBc at 40MHz and -84/-90dBc at 70MHz. The ADA4938-1 works over a 5V to 10V supply range and achieves distortion of -112/-108dBc at 10MHz, -96/-93dBc at 30MHz and -79/-81dBc at 50MHz in dual-supply applications. The ultralow distortion of the ADA4937-1 and ADA4938-1 is achieved through the use of ADI's XFCB-3, a proprietary and specialized SiGe silicon-on-insulator process technology.

Feedback architecture
The devices also feature an internal common-mode feedback architecture, which allows the output common-mode voltage to be controlled by an externally applied voltage. This 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 DAQ instruments and baseband communications systems.

The ADA4937-1 and ADA4938-1 are sampling today with full production scheduled for April and June 2007, respectively. The devices are priced at $3.79 per unit in 1,000-piece quantities in a 3-by-3mm LFCSP and are specified over an operating temperature range of 0 to 85C.

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Related Datasheets
Part Number Description Category
? ADA4937-1 Ultralow Distortion Differential ADC Driver (Single) Actives - Sensors and Transducers
? ADA4938-1 Ultralow Distortion Differential ADC Driver (Single) Actives - Sensors and Transducers



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