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AD8488:  128-Channel Digital X-Ray Analog Front End

Product Details

Product Status:Recommended for New Designs

The AD8488 is a 128-channel analog front end designed for use in high performance digital X-ray systems. The analog channels consist of an integrator followed by a gain selectable single-ended to low impedance differential output. The analog channel converts the charge acquired by X-ray or photodiode detectors to a voltage. The channels are composed of CMOS transistors, using typical high input impedance CMOS gates. The integrators generate charge dependent voltages using a range of selectable capacitance values that accommodate a broad range of input charge values. The integrators are followed by single-ended input to differential output voltage amplifiers where offset and low frequency noise voltages are subtracted from the input voltages. A 128:1 channel differential MUX follows the buffers and drives the analog output buffer. Switch drivers and certain digital timing functions are included, and all are mounted on a 255-lead BGA substrate. Charge conversion for all 128 channels is simultaneous followed by a sequential voltage output read of the channels using a 7-bit address code. The sequence occurs twice, sampling all 128 channels. Logic control inputs, CS_A and CS_B select the lower and upper 64-blocks of channel addresses.

The AD8488 is packaged in a 17 mm × 17 mm 255-lead RoHS compliant ball grid array (BGA). The operating temperature range is 0°C to 85°C ambient.

Applications
  • High performance digital X-ray systems
  • Medical X-ray
  • Security (baggage scanner) systems

FEATURES and BENEFITS

  • 128 integrator channels
  • Correlated double sample error correction (CDS)
    - Corrects for VOS and LF noise
  • Power consumption/channel
    - Normal: 11 mW
    - Low power: 4 mW
  • Low input leakage current
    - 1.5 pA typical
  • Low input referred noise (QNI)
    - 1000 e−rms typ
  • Linearity error
    - 0.03% typical
  • Compact 17 mm × 17 mm BGA
  • Selectable filter time constants
  • 4 selectable input charge ranges
  • 10 selectable gain ranges

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

AD8488 Model Options
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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