AFE2257 256-channel analog front end (AFE) for digital X-ray flat-panel detectors w/ HD capacitor | TI.com

AFE2257
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256-channel analog front end (AFE) for digital X-ray flat-panel detectors w/ HD capacitor

 

More information

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

Description

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.

Features

  • 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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Parametrics

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Part number Order Number of input channels Resolution (Bits) Interface Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Approx. price (US$)
AFE2257 Order now 256     16     SPI/LVDS     Internal Reference Buffer
Nap Mode
Power Down
X-ray    
0 to 85     COF | 320     320COF: 1064 mm2: 28 x 38 (COF | 320)     100.00 | 1ku    
AFE2256 Samples not available 256     16     SPI/LVDS     Internal Reference Buffer
Nap Mode
Power Down
X-ray    
0 to 85     COF | 320
COF | 325    
325COF: 1040 mm2: 21.5 x 48.35 (COF | 325)
320COF: 1064 mm2: 28 x 38 (COF | 320)    
100.00 | 1ku