Product details


Number of input channels 256 Resolution (Bits) 16 Interface type SPI/LVDS Features Internal Reference Buffer, Nap Mode, Power Down, X-ray Operating temperature range (C) 0 to 85 open-in-new Find other Digital X-ray AFEs

Package | Pins | Size

COF (TDU) 320 open-in-new Find other Digital X-ray AFEs


  • 256 Channels
  • On-chip, 16-bit ADC
  • Photodiode short immunity
  • High performance:
    • Noise: < 600 electrons
    • Low correlated noise
    • Full-channel integral nonlinearity:
      ±2 LSB with internal 16-Bit ADC
    • Scan time: < 20 µs to > 250 µs
  • Integration:
    • Programmable full-scale input charge range:
      < 1 pC to > 25 pC
    • Internal timing generator (TG)
    • Built-in correlated double sampler
    • Pipelined integrate-and-read for improved throughput—data-read during integration
    • Serial LVDS output
  • Simple power-supply scheme:
    • AVDD1 = 1.85 V
    • AVDD2 = 3.3 V or 4.75 V
  • Low power consumption
  • Nap and total power-down modes
  • Pin compatible to AFE2256

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open-in-new Find other Digital X-ray AFEs


The AFE2257 is a 256-channel charge readout IC (ROIC) designed for flat-panel detector (FPD) based digital x-ray systems. The device includes 256 integrators, correlated double samplers (CDSs) with dual banking, and 256:4 analog multiplexers.

The device also features four 16-bit successive-approximation register (SAR) analog-to-digital converters (ADCs). Serial data from the ADCs are available in low-voltage differential signaling (LVDS) format.

The device optimizes the overall x-ray system performance using features such as multiple power modes and in-system debug options. The nap and power-down modes enable substantial power savings, and are especially useful in battery-powered systems.

open-in-new Find other Digital X-ray AFEs

More information

Full data sheet and other design resources are available under NDA. Request now

Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet AFE2257 256-Channel, analog front-end for digital X-ray, flat-panel detectors datasheet Mar. 15, 2019
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Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The AFE2256EVM is a compact USB based evaluation kit for evaluating the AFE2256 COF, a 256-channel analog front-end. The EVM is self-contained with DACs and power generation on-board which greatly reduces its dependency on external equipment. The kit consists of an EVM and two separate COF adapters (...)

  • Allows quick evaluation of AFE2256 COF devices (externally detachable)
  • GUI software allows easy control of AFE2256 device modes and functions
  • On board 3.3V and 1.8V DUT power generation
  • On board FPGA based pattern generation and data acquisition
  • Communicates with Personal Computer through a USB 2.0 (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

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COF (TDU) 320 View options

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