ADAS1131:  256-Channel, 24-Bit Current-to-Digital ADC Module

Product Details

Product Status:Recommended for New Designs

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.


  • 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)


  • 256-channel, current-to-digital converter
  • 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
  • See data sheet for additional features

Functional Block Diagram for ADAS1131

A short-form datasheet for this product is available for download from this web page. Complete documentation including detailed hardware and software guides are available upon completion of a Non-Disclosure Agreement (NDA) (pdf, 30,264 bytes). Send your completed forms by e-mail to Additional support is available from your Analog Devices local sales.

Please contact the ADC Development Group for additional technical information.

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