Product category: Analogue and Mixed Signal ICs
News Release from: National Semiconductor | Subject: ADC08D1000
Edited by the Electronicstalk Editorial Team on 21 September 2004
Gigahertz-speed dual convertor performs
frugally
A new dual high-performance CMOS ADC consumes significantly less power than competing products while providing the gigahertz speeds necessary for reliable measurements of high-frequency signals.
A new dual high-performance CMOS analogue-to-digital convertor (ADC) consumes significantly less power than competing products while providing the gigahertz speeds necessary for reliable measurements of high-frequency signals These high-speed, low-power devices are designed specifically for applications such as digital oscilloscopes, automated test equipment (ATE), basestations, satellites, and communications systems requiring direct I/Q down-conversion
This article was originally published on Electronicstalk on 30 Jan 2007 at 8.00am (UK)
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As one of the key building blocks in system signal path designs, ADCs accurately capture real-world analogue information and convert it for processing in the digital domain.
The ADC08D1000 digitises two input signals to 8bit resolution at sampling rates up to 1Gsample/s while consuming just 1.6W from a 1.9V nominal supply.
By using the innovative fully programmable dual-edge sampling feature, the product can achieve 2Gsample/s sampling from one channel by interleaving the two on-chip convertors.
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Both coarse and fine timing adjustments are available, allowing the sampling clock for each channel to be calibrated independently in 0.1ps increments.
A three-wire serial bus controls these adjustments, as well as on-chip functionality, and independent gain and offset fine-tuning for I and Q channels.
The ultralow power requirements of the ADC08D1000 enable designers to eliminate fans or heat sinks, saving board space and reducing system cost.
"National's rapidly expanding portfolio of data convertor solutions is enabling dramatic improvements in performance throughout the entire analogue signal path", said Suneil Parulekar, Executive Vice President, Analogue Products Group.
"The new ADC08D1000 extends National's range of high-speed products to offer designers a choice of the industry's lowest-power, highest-accuracy products on the market".
"Our best-in-class ADCs enable system makers to differentiate their products by offering improved image resolution, enhanced reliability, smaller form factors and lower power".
With more than 10 patents pending on its design, National's ADC08D1000 is fabricated using the company's state-of-the-art 0.18-micron high-performance CMOS process technology.
The chip features on-chip auto calibration at power-up that enables low power with high performance.
In addition, it has a unique performance-enhancing folding/interpolating architecture.
Folding reduces the number of comparators, and interpolation greatly reduces the number of front-end amplifiers required, saving power and reducing the load on the input signal.
The ADC08D1000 has an ideal pulse response and guarantees "no missing codes" over the full operating temperature range of -40 to +85C.
This enables the product's high level of performance and accuracy.
In addition, the ADC08D1000 features a National LVDS (low voltage differential signalling) interface, which enables reliable transmission of high-speed signals, while maintaining low noise and distortion levels.
The ADC08D1000 is designed with an extremely low bit-error rate of 10e-18.
At a 1GHz sampling rate the ADC08D1000 achieves 0.25LSB differential nonlinearity, 0.35LSB integral nonlinearity and maintains an effective 7.5bit from DC up to input frequencies of 500MHz (Nyquist).
Measured crosstalk between the I and Q channels is less than -77dB.
The dual on-chip sample-and-hold amplifiers deliver excellent dynamic performance over a 1.7GHz full power bandwidth.
With the introduction of the ADC08D1000, National continues to expand its line of high-performance, low-power 8 to 12bit ADC offerings.
It joins National's single ADC081000 high-performance CMOS analogue-to-digital convertor.
These products will be followed closely by a 500Msample/s version and National's 1.5Gsample/s device in the first quarter of 2005.
All speed grades in National's portfolio of ultra-high-speed convertors have the same pinout, allowing the designer to change the sampling rate without changing the board layout.
In addition, National is developing higher-resolution 14 and 16bit pipeline ADCs and continuing to build its low-power, general purpose SAR (successive approximation register) ADCs for broad market applications.
The ADC08D1000, housed in a 128-lead exposed-pad package, is priced at $219 in 1000-off volumes.
The product is scheduled for full production release in January 2005 and samples will be available at that time.
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