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AFE3256
  • AFE3256

AFE3256

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256-channel analog front end (AFE) for dynamic and semi-dynamic X-ray flat-panel detectors

Texas Instruments AFE3256 Product Info

1 April 2026 3

Parameters

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 70

Rating

Catalog

Package

COF (TFU)-320-1064 mm² 38 x 28

Features

  • 256 channels
  • On-chip, 16-bit ADC
  • High performance:
    • Noise: 440 electrons RMS (1.2-pC input charge range)
    • Low correlated noise
    • Full-channel integral nonlinearity: ±2 LSB at 16 bit
    • Scan time: < 16 µs to 204.8 µs
  • Integration:
    • Programmable full-scale input charge range: 0.3pC to 12.5pC with resolution of 0.3pC
    • Internal timing generator (TG)
    • Built-in correlated double sampler
    • Software programmable electron or hole integration mode
    • Pipelined integrate-and-read for improved throughput—data-read during integration
    • Serial LVDS output
    • On-chip temperature sensor
  • Simple power supply scheme:
    • Single 1.85V power supply operation
  • Multiple power modes with power consumption ranging from 1mW/ch to 2mW/ch
  • Power-down modes: sleep and standby
  • Binning mode support
  • Custom chip-on-film (COF) packages
  • 256 channels
  • On-chip, 16-bit ADC
  • High performance:
    • Noise: 440 electrons RMS (1.2-pC input charge range)
    • Low correlated noise
    • Full-channel integral nonlinearity: ±2 LSB at 16 bit
    • Scan time: < 16 µs to 204.8 µs
  • Integration:
    • Programmable full-scale input charge range: 0.3pC to 12.5pC with resolution of 0.3pC
    • Internal timing generator (TG)
    • Built-in correlated double sampler
    • Software programmable electron or hole integration mode
    • Pipelined integrate-and-read for improved throughput—data-read during integration
    • Serial LVDS output
    • On-chip temperature sensor
  • Simple power supply scheme:
    • Single 1.85V power supply operation
  • Multiple power modes with power consumption ranging from 1mW/ch to 2mW/ch
  • Power-down modes: sleep and standby
  • Binning mode support
  • Custom chip-on-film (COF) packages

Description

The AFE3256 is a 256-channel, analog front-end (AFE) designed to suit the requirements of flat-panel detector (FPD) based digital X-ray systems. The device includes 256 integrators, correlated double samplers (CDSs) with dual banking, and 256:2 analog multiplexers. The device also features two 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, also commonly referred to as a readout integrated circuit (ROIC), optimizes the overall system performance using features such as multiple power modes and in-system debug options.

The sleep and standby modes enable substantial power saving which is critical for battery-powered systems.

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