256 channel ADC for CT scanners

For simultaneous integration and sampling of 256 analogue current inputs, Analog Devices has introduced the ADAS1131.

Inside are 256 current integrators, 256 sample-and-holds, and ADCs with configurable sampling rate and up to 24bit resolutions. 11.656ksample/s (86μs) is available at 20bit resolution.

Integral linearity is +/-0.015% of reading +/-0.4ppm of full scale with one channel active, or +/-0.050% of reading +/-1.0ppm of full-scale with all channels active.

“The signal chain and sampling architecture is designed to guarantee that all channels are simultaneously sampled, and that no charge is lost throughout the sampling process,” said ADI.

Dissipation is 3mW per channel at any throughput.

All converted channel results are output on a single, low voltage differential signaling (LVDS), self-clocked serial interface.

Configuration is over an SPI-compatible serial interface, and integration includes: a temperature sensor, reference buffer, and decoupling capacitors.

Aimed at CT scan inputs and photodiode arrays, devices cost $304 each when buying 1,000.

Support tools include an evaluation board, reference design including layout, and FPGA Verilog code.

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via Yuichun