Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: ADA4937-2 and ADA4938-2
Edited by the Electronicstalk Editorial
Team on 27 September 2007
Drivers add flexibility to analogue
design
Dual differential ADC drivers enable designers of data acquisition systems to improve system performance by enhancing key ADC performance characteristics.
The ADA4937-2 and ADA4938-2 are billed by Analog Devices as the industry's first dual differential analogue-to-digital convertor (ADC) drivers The new differential drivers enable designers of data acquisition systems in industrial and communications applications to improve system performance by enhancing key ADC performance characteristics, including SFDR (spurious-free dynamic range) and SNR (signal-to-noise ratio)
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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With the industry's first two-channel configuration, the ADA4937-2 and ADA4938-2 drivers reduce component count, bill of material cost and design complexity while driving high-performance ADCs operating from dc to 100MHz.
The ADI ADA4937-2 and ADA4938-2 differential drivers combine the low noise and distortion levels required to drive the high-speed ADCs found in today's wireless infrastructure and instrumentation equipment.
Ideal for single 3 to 5V power supplies, the ADA4937-2 achieves an industry-best distortion of -120/ -102dBc at 10MHz, -98/ -100dBc at 40MHz and -84/ -90dBc at 70MHz.
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The ADA4938-2 works over a 5 to 10V supply range and achieves industry-leading distortion of -112/ -108dBc at 10MHz, -96/ -93dBc at 30MHz and -79/ -81dBc at 50MHz in dual supply applications.
Featuring an internal common-mode feedback architecture, the ADA4937-2 and ADA4938-2 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.
Both the ADA4937-2 and the ADA4938-2 are fabricated using ADI's proprietary silicon-germanium (SiGe) complementary bipolar process, enabling very low levels of distortion with an input voltage noise of only 2.2nV/(rt)Hz.
The low DC offset and excellent dynamic performance of the ADA4937-2 make it well suited for a variety of data acquisition and signal processing applications.
The ADA4937-2 and ADA4938-2 dual differential ADC drivers are sampling now with full production scheduled for October 2007.
The devices are priced at US $5.69 per unit in 1000-piece quantities in a Pb-free 4 x 4mm 24-lead LFCSP (lead-frame chip-scale package) and are specified to operate over the -40 to +105C temperature range for 3.3V supplies and the -40 to +85C temperature range for 5V supplies.
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