ADAS1131

256-Channel, 24-Bit Current-to-Digital ADC Module

NOT RECOMMENDED FOR NEW DESIGNS

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Features

256-channel, current-to-digital converter module
Up to 24-bit resolution
Variable integration time
- Fastest integration time: 11.656 kSPS (86 μs) at 20-bit resolution
Low power dissipation: 3 mW per channel at any throughput
Integral linearity
- ±0.015% of reading ±0.4 ppm of FSR: single channel active
- ±0.050% of reading ±1.0 ppm of FSR: all channels active
Very low noise
Simultaneous sampling
- No dead time, no loss of charge, 100% charge collection
User adjustable full-scale range
On-board temperature sensor and reference buffer
15 mm × 15 mm, CSP_BGA package
Simple printed circuit board (PCB) design
- Integrated capacitors for supply and reference decoupling
- 0.80 mm pitch BGA allows low cost PCB technology
Support tools
- Evaluation board
- Reference design with reference layout
- FPGA Verilog code

Additional Details

The ADAS1131 is a 256-channel, current-to-digital analog-to- digital converter (ADC) module. It contains 256 low power, low noise, low input current integrators, simultaneous sample-and- holds, and two high speed, high resolution ADCs with configurable sampling rate and resolutions of up to 24 bits. The signal chain and sampling architecture of the ADAS1131 is designed to guarantee that all channels are simultaneously sampled, and that no charge is lost throughout the sampling process.

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

An SPI-compatible serial interface allows configuration of the ADC using the SDI_x input. The SDO_x output allows the user to daisy-chain several ADCs on a single, 3-wire bus. The ADAS1131 uses the separate supply, IOVDD, to reduce digital noise effect on the conversions.

The ADAS1131 is in a 15 mm × 15 mm, CSP_BGA package.

APPLICATIONS

Medical, industrial, and security CT scanner data acquisition
Photodiode sensors
Dosimetry and radiation therapy systems
Optical fiber power monitoring
X-ray detection systems
High channel-count data acquisition systems (current or
voltage inputs)

Complete documentation is available upon completion of a Non-Disclosure Agreement (NDA). Please send your project details, company information and contact by e-mail to ADAS@analog.com.

Please contact the ADC Development Group for additional technical information.

For additional ADI Healthcare Products and related information, please visit www.analog.com/healthcare.