Product details

Number of input channels 256 Resolution (Bits) 16 Features Internal Reference Buffer, Nap Mode, Power Down, X-ray Interface type SPI/LVDS Operating temperature range (C) 0 to 85
Number of input channels 256 Resolution (Bits) 16 Features Internal Reference Buffer, Nap Mode, Power Down, X-ray Interface type SPI/LVDS Operating temperature range (C) 0 to 85
COF (TDU) 320 1064 mm² 28 x 38
  • 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
  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet AFE2257 256-Channel, analog front-end for digital X-ray, flat-panel detectors datasheet 15 Mar 2019
Technical article Offset correction improves the next generation of heart-rate smart watches 24 Aug 2015
Technical article A new way to illuminate the human condition 30 Dec 2013
Technical article Oximeter signaling: There’s more than meets the eye 04 Dec 2013
Technical article Virtual hospital implementation using a worn health monitor 13 Nov 2013

Design & development

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Evaluation board

AFE2256EVM — AFE2256 256-channel AFE for digital X-ray flat-panel detectors evaluation module

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 (...)

Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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COF (TDU) 320 View options

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