256-Channel, 16-Bit Digital X-Ray Analog Front End from ADI

27th November 2012

Analog Devices

ES Admin

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Datasheet

Analog Devices today introduced a highly integrated digital X-ray analog front end with the industry’s lowest noise performance in multiple power-mode options, and the highest image quality. The 256-channel ADAS1256 digital X-ray AFE is the industry’s first single-chip solution to integrate the complete charge-to-digital conversion signal chain by incorporating low-noise programmable-charge amplifiers, correlated double-sampling circuitry and 16-bit A/D converters.

With a noise figure of an equivalent charge of 560 electrons at a 2-picocoulomb full-scale range, the ADAS1256 enables high resolution digital X-ray images while reducing patient exposure to X-ray dose. The ADAS1256 has multiple functional power modes ranging from 1-mW/channel to 3-mW/channel, allowing manufacturers to address a wide range of digital X-ray modalities including portable radiology and mammography as well as high speed fluoroscopy and cardiac imaging.

“Thanks to the ultra-low-noise profile and dynamic range of the ADAS1256, digital X-ray technology will continue to deliver better diagnostic image quality and reduce radiation dosage applied to patients compared to existing digital X-ray systems,” said Pat O’Doherty, vice president, healthcare group, Analog Devices. “By achieving this level of performance while adhering to a strict power budget, the ADAS1256 digital X-ray AFE provides medical equipment designers with a single device that serves the growing high-performance requirements of the portable digital X-ray market.”

The ADAS1256 is a 256-channel, simultaneous sampling, high dynamic range, low power analog front end that is a complete charge-to-digital conversion signal chain. It incorporates 256 low noise integrators, low pass filters, and correlated double samplers that are multiplexed into a high speed, 16-bit, A/D converter. All converted channel results are output on a single LVDS self-clocked serial interface. The ADAS1256 can be programmed using an SPI-compatible daisy-chain serial interface. It is delivered on a high density system-on-flex package and can be directly mounted on a digital X-ray panel.

ADAS1256 Digital X-Ray AFE Key Features:

• Single-chip, 256-channel, charge-to-digital conversion
• 16-bit resolution with no missing codes
• Simultaneous sampling
• User adjustable full-scale range up to 32 picocoulombs
• Ultralow noise: 560 e− at 2pC range
• Multiple functional power modes: from 1-mW/ch to 3-mW/ch
• Power-down and sleep modes down to 0.005-mW/ch

Pricing, Availability and Complementary Products

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The ADAS1256 is compatible with the ADP7104 and ADP1708 low dropout linear regulators, ADP1828 synchronous, step-down dc-to-dc controller, ADR444 voltage reference, ADCLK846 LVDS/CMOS fanout buffer and ADXL345 MEMS digital accelerometer.