SBAS693B March   2015  – May 2016 AFE2256

PRODUCTION DATA.  

  1. 1Features
  2. 2Applications
  3. 3Description
  4. 4Revision History
  5. 5Device and Documentation Support
    1. 5.1 Documentation Support
      1. 5.1.1 Related Documentation
    2. 5.2 Trademarks
    3. 5.3 Electrostatic Discharge Caution
    4. 5.4 Glossary
  6. 6Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • 256 Channels
  • On-Chip, 16-Bit ADC
  • Photodiode Short Immunity
  • High Performance:
    • Noise: 750 Electrons RMS
      (1.2-pC Input Charge Range)
    • Low Correlated Noise
    • Integral Nonlinearity:
      ±2 LSB with Internal 16-Bit ADC
    • Scan Time:
      • < 20 µs to 204.8 µs
  • Integration:
    • Six Selectable, Full-Scale Input Ranges:
      0.6 pC (Min) to 9.6 pC (Max)
    • Internal Timing Generator (TG)
    • Built-In Correlated Double Sampler
    • Pipelined Integrate and Read for Improved Throughput: Allows Data Read During Integration
    • Serial LVDS Output
  • Simple Power-Supply Scheme:
    • AVDD1 = 1.85 V
    • AVDD2 = 3.3 V
  • Low Power Consumption
  • Nap and Total Power-Down Mode
  • Custom Chip-On-Film (COF) Packages

2 Applications

  • Flat-Panel, X-Ray Detectors
  • Charge Detectors
  • Capacitance Measurement

3 Description

The AFE2256 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 , a programmable gain amplifier (PGA) for full-scale charge level selection, a correlated double sampler (CDS) 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 Nap and power-down modes enable substantial power saving that is especially useful in battery-powered systems.

To request a full datasheet or other design resources: request AFE2256

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
AFE2256 COF (320) 38.00 mm × 28.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

AFE2256 Schematic

AFE2256 schmtc_dgm_bas693.gif