Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD9460 and AD9461
Edited by the Electronicstalk Editorial
Team on 15 March 2006
Convertors cope with high-speed inputs
High-performance ADCs enable designers to maintain low noise and high dynamic range, even at high input frequencies.
Analog Devices is expanding its portfolio of high-performance analogue-to-digital convertors (ADCs) with the introduction of two devices targeted for high-end instrumentation, medical and wireless communications applications that enable designers to maintain low noise and high dynamic range, even at high input frequencies Designers of medical systems, such as magnetic resonance imaging and patient monitoring receivers, which involve complex, multichannel designs will benefit from the new convertors which offer the highest signal to noise ratio (SNR) at 79dB, and deliver 16bit precision at high IFs (intermediate frequency) and supporting sampling rates up to 130Msample/s
This article was originally published on Electronicstalk on 2 Jul 2008 at 8.00am (UK)
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In addition to an internal buffer that isolates and eases driving of the ADC inputs, the new devices offer 15% lower jitter than existing solutions - an important factor in maintaining low system noise floors.
The new convertors - the AD9460 and AD9461 - provide 16bit performance up to 130Msample/s, enabling the high dynamic range required for signal analysis, radar, magnetic resonance imaging (MRI), and multi-carrier/multi-std wireless communications systems.
In these designs, higher ADC sampling rates allow engineers to capture and digitise wider signal bandwidths and to handle higher-magnitude magnetic fields for superior imaging in MRI.
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In addition, the AD9460 and AD9461 operate with lower power to aide in multichannel systems.
The AD9460, offered at 80 and 105Msample/s sampling rates, consumes 1.4 and 1.6W, respectively.
At its highest sampling rate of 130Msample/s, the AD9461 consumes 1.9W.
"System designers are challenged with convertor performance tradeoffs in order to optimise their dynamic range, speed and power".
"For devices requiring very high image quality, for example, the need for high sampling rates for faster data capture while maintaining high accuracy and SNR can increase ADC power", said Kevin Kattmann, Product Line Director, High-speed Signal Processing, Analog Devices.
"Leveraging the superior performance of our AD9446, we are able to deliver these higher sampling rate extensions to our 16bit ADC family at significantly lower power dissipation".
"The AD9460 and AD9461 offer the wide bandwidth, high speed, exceptional linearity and low noise our customers have come to expect from the AD9446 family".
The AD9460 and AD9461 ADCs feature an 85dB full-scale noise floor, SNR of 79dB and true 16bit linearity (DNL +/-0.5LSB).
SFDR is superior at 92dB with an input frequency of 170MHz and 88dB with an input frequency of 250MHz.
Both devices include an integrated input buffer to isolate the ADC input, eliminating the need for external buffering that can consume up to 1W of power, thereby easing the driving of the ADC, whether driven by transformers or amplifiers.
When input amplifiers are required for signal amplification or single-ended to differential conversion, the AD8138 and AD8139 are ideal for driving the AD9460 and AD9461 at baseband (below 100MHz) input frequencies, and the AD8352 serves as an excellent IF-sampling (above 100MHz) input amplifier.
The flexible, 2-4V peak-peak input voltage range of the AD9460 and AD9461 allow designers to optimise SNR and SFDR depending on their sampling rate and input frequency.
The devices join a family of convertors designed to deliver exceptional signal noise reduction, high resolution and fast sampling rates.
The first device in the family, the AD9446, was introduced last May and released last October.
The AD9460 and AD9461 ADCs are sampling now with production quantities available in March.
Available in a Pb-free, 100-lead surface mount plastic package (100-lead TQFP/EP), the AD9460 is priced at $48.33 (80Msample/s) and $56.67 (105Msample/s), and the AD9461 (130Msample/s) is priced at $65.00, each in 1000-unit quantities.
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