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Product details

Parameters

Number of input channels 2 Resolution (Bits) 20 Features Computed Tomography (CT) Operating temperature range (C) -40 to 85, 0 to 70 Interface type Serial open-in-new Find other Computer tomography (CT) AFEs

Package | Pins | Size

SOIC (DW) 28 184 mm² 17.9 x 10.3 TQFP (PJT) 32 81 mm² 9 x 9 open-in-new Find other Computer tomography (CT) AFEs

Features

  • MONOLITHIC CHARGE MEASUREMENT ADC
  • DIGITAL FILTER NOISE REDUCTION:
       3.2ppm, rms
  • INTEGRAL LINEARITY:
       ±0.005% Reading ±0.5ppm FSR
  • HIGH PRECISION,TRUE INTEGRATING FUNCTION
  • PROGRAMMABLE FULL SCALE
  • SINGLE SUPPLY
  • CASCADABLE OUTPUT
  • APPLICATIONS
    • DIRECT PHOTOSENSOR DIGITIZATION
    • CT SCANNER DAS
    • INFRARED PYROMETER
    • PRECISION PROCESS CONTROL
    • LIQUID/GAS CHROMATOGRAPHY
    • BLOOD ANALYSIS

Protected by US Patent #5841310
All trademarks are the property of their respective owners.

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Description

The DDC112 is a dual input, wide dynamic range, charge-digitizing analog-to-digital (A/D) converter with 20-bit resolution. Low-level current output devices, such as photosensors, can be directly connected to its inputs. Charge integration is continuous as each input uses two integrators; while one is being digitized, the other is integrating.

For each of its two inputs, the DDC112 combines current-to-voltage conversion, continuous integration, programmable full-scale range, A/D conversion, and digital filtering to achieve a precision, wide dynamic range digital result. In addition to the internal programmable full-scale ranges, external integrating capacitors allow an additional user-settable full-scale range of up to 1000pC.

To provide single-supply operation, the internal A/D converter utilizes a differential input, with the positive input tied to VREF. When the integration capacitor is reset at the beginning of each integration cycle, the capacitor charges to VREF. This charge is removed in proportion to the input current. At the end of the integration cycle, the remaining voltage is compared to VREF.

The high-speed serial shift register which holds the result of the last conversion can be configured to allow multiple DDC112 units to be cascaded, minimizing interconnections. The DDC112 is available in a SO-28 or TQFP-32 package and is offered in two performance grades.

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Technical documentation

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Type Title Date
* Datasheet DDC112: Dual Current Input 20-Bit Analog-To-Digital Converter datasheet (Rev. B) Oct. 06, 2004
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User guides DDC11xEVM-PDK User's Guide (Rev. A) Jul. 09, 2010
More literature DDC11xEVM Readme Page Thank You Letter Nov. 07, 2007
Application notes Creating a Bipolar Input Range for the DDC112 Sep. 27, 2000
User guides DEM-DDC112U-C: Demonstration Fixture for the DDC112 Sep. 27, 2000
Application notes Multi-DDC112 DUT Board for the DDC112 Evaluation Fixture Sep. 27, 2000
Application notes Retrieving Data from the DDC112 Sep. 27, 2000
Application notes The DDC112\'s Test Mode Sep. 27, 2000
Application notes Understanding The DDC112\'S Continuous and Non-Continuous Modes Sep. 27, 2000
Application notes Using External Integration Capacitors on the DDC112 Sep. 27, 2000

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$499.00
Description

The DDC11xEVM-PDK provides an easy-to-use platform for evaluating the DDC112 or DDC114 charge digitizing A/D converters. A PC interface board (DDCMB) and daughter boards for the DDC112 or DDC114 are included along with software that makes analysis and testing of these devices manageable.

Features
  • The DDC112 is a wide range, charge digitizing A/D converter with 20-bit resolution
  • Low-level current output devices, such as photo sensors, can be directly connected to the DDC112 input.
  • The DDC112 combines current-to-voltage conversion, integration, and digital filtering to produce wide range of (...)

Design tools & simulation

GERBER FILES Download
SBAC114.ZIP (240 KB)

CAD/CAE symbols

Package Pins Download
SOIC (DW) 28 View options
TQFP (PJT) 32 View options

Ordering & quality

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