No crosstalk for speedy dual ADC
According to Analog Devices, at 65Msample/s the 12bit AD9238 is the industry's fastest dual-channel A/D convertor.
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According to Analog Devices, at 65Msample/s the 12bit AD9238 is the industry's fastest dual-channel A/D convertor. The combination of the AD9238 with ADI's driver operational amplifiers gives engineers the advantage of complete solution sets for applications such as high-end medical imaging and multichannel wideband communications. The AD9238 - offered in 20, 40 and 65Msample/s speed grades - delivers the same outstanding dynamic performance found in two single ADCs while maintaining exceptional crosstalk immunity in a single space-efficient package.
As the power consumption at 3V is up to 50% less than equivalent ADCs - ranging from 180 to 600mW over the three speed grades - it is ideal for applications that demand reduced power usage and board area.
These requirements are particularly evident in three application areas: ultrasound technology, where the trend is toward migration to 12bit ADCs for high-end systems that support channel counts as high as 128, putting board space at a premium; cellular and wireless broadband applications, especially pico-cell basestations, which have significant space constraints but must maintain the high performance of conventional basestations; and portable bench test equipment, such as digital oscilloscopes, and handheld instrumentation devices, such as digital multimeters, where power and size are critical concerns.
"High performance combined with low power expenditure and a small footprint are 'must-have' features for the most demanding applications in the medical imaging, communications infrastructure and test equipment industries", said Kevin Kattmann, product line director for High-Speed Convertors at Analog Devices.
"For example, ultrasound equipment manufacturers are now exploring hand-carried units with wireless connectivity so they can be easily transported from department to department.
Users are demanding increasingly streamlined, reliable and durable portable test instruments as more operational testing is conducted in the field.
With its dual-channel capability, the AD9238 is well equipped to meet the advancements continuously being made in these kinds of applications without sacrificing performance".
The AD9238 features dual high-performance sample-and-hold amplifiers and an integrated voltage reference.
It operates from a single 3V power supply, and has a separate digital output driver supply to accommodate 2.5 and 3.3V logic families.
Depending on the application, design engineers can choose from three speed grades, each characterized by low power consumption ranging from 180mW when operating at 20Msample/s, to 330mW for datarates of 40Msample/s, to 600mW at 65Msample/s.
The AD9238 provides best-in-class dynamic specifications with 70dB signal-to-noise ratio (SNR) and 85dB spurious free dynamic range (SFDR).
The high SNR provides superior image quality in imaging applications.
Additionally, the device features exceptional channel matching and excellent crosstalk isolation, with virtually no crosstalk over the full operating range.
The on-chip wideband, differential sample and hold amplifier (SHA) allows for a variety of user-selectable input ranges and offsets, including single-ended configurations.
It is also suitable for applications involving multiplexed systems that switch full-scale voltage levels in successive channels, and for sampling inputs at frequencies up to 200MHz, well beyond the Nyquist rate.
Two single-ended, independent clock inputs are available to give the user system flexibility.
Parallel 12bit data outputs are provided for each channel.
Also, a pin selectable MUX mode allows the user to multiplex the data from both channels onto a single 12bit output databus, further reducing the number of output digital traces.
A duty cycle stabiliser on the 65Msample/s model can compensate for wide variations in the clock duty cycle, while allowing the convertors to maintain excellent dynamic performance.
The AD9238 is sampling in a 64-lead LQFP (low-profile quad flat package) and is priced at $13.15 per unit in 1000-unit quantities for the 20Msample/s model; $14.95 for the 40Msample/s model; and $21.95 for the 65Msample/s model.
The AD9238 is expected to be in full-volume production in August 2002.
(This was Electronicstalk's Top Story on 10 July 2002)
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