Data Acquisition Chip Enables High-slice-count Ct Scanners For Fast, Clear Images

摘要

Analog Devices introduced a current-to-digital converter chip that is asserted to enable high-slice-count CT systems to capture real-time moving images- such as a beating heart- with a high degree of accuracy and detail. The ADAS1128 24-bit current-to-digital converter changes photodiode array signals into digital signals. The product offers 128 data conversion channels, provides an increase in speed from 6 kSPS to 20 kSPS, and supports four times more channels (128 versus 32) than any other integrated converter solution, according to the company. The ADAS1128 includes simultaneous sample holds and two high-speed, high resolution ADCs with configurable sample rate and resolution up to 24 bits. All converted channel results are output on a single LVDS self-clocked serial interface, reducing external hardware. An SPI-compatible serial interfaci allows configuration of the ADC using the SDI input. The SDO output allows the designer to daisy chain several ADCs on a single, three-wire bus. It uses the separate supply VIO to reduce digital noise effect on the conversions. The ADAS1128 consumes 0.5 mW/channel at full speed.