Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: ADA4937-1 and ADA4938-1 differential drivers
Edited by the Electronicstalk Editorial
Team on 12 February 2007
Differential drivers have low distortion
Analog Devices has extended its family of differential amplifiers by introducing two new devices with distortion levels 10dB lower than competing devices.
Analog Devices has extended its family of differential amplifiers by introducing two new devices with distortion levels 10dB lower than competing devices The ADA4937-1 and ADA4938-1 differential drivers are optimised for driving the highest performance ADCs from dc to 100MHz
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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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 data-acquisition 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.
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"Lower distortion levels allow designers to maintain the quality of key ADC performance characteristics, including spurious-free dynamic range and signal-to-noise ratio, leading directly to improved system performance", saysJim Doscher, Product Line Director, High-Speed Linear Products at Analog Devices "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.
Ideal for single 3 to 5V power supplies, the ADA4937-1 achieves a distortion rating of -120/-102 dBc at 10MHz, -98/-100 dBc at 40MHz and -84/-90 dBc at 70MHz.
The ADA4938-1 works over a 5 to 10V supply range and achieves distortion of -112/-108 dBc at 10MHz, -96/-93 dBc at 30MHz and -79/-81 dBc at 50MHz in dual supply applications.
The ultra-low distortion of the ADA4937-1 and ADA4938-1 is achieved through the use of ADI 's XFCB-3, a proprietary and specialised silicon germanium (SiGe) silicon-on-insulator (SOI) process technology.
The devices also have 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 data-acquisition instruments and baseband communications systems.
The ADA4937-1 and ADA4938-1 are sampling now with full production scheduled for April, 2007 and June, 2007, respectively.
The devices are priced at $3.79 per unit in 1,000-piece quantities in a 3x3 mm LFCSP (lead frame chip scale package) and are specified over an operating temperature range of 0 to + 85C.
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