Product details

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
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
SOIC (DW) 28 184 mm² 17.9 x 10.3 TQFP (PJT) 32 81 mm² 9 x 9
  • 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.

  • 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.

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.

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
* Data sheet DDC112: Dual Current Input 20-Bit Analog-To-Digital Converter datasheet (Rev. B) 06 Oct 2004
Technical article Helping physicians achieve faster, more accurate patient diagnoses with molecular test technology 20 May 2020
Technical article Offset correction improves the next generation of heart-rate smart watches 24 Aug 2015
Technical article A new way to illuminate the human condition 30 Dec 2013
Technical article Oximeter signaling: There’s more than meets the eye 04 Dec 2013
User guide DDC11xEVM-PDK User's Guide (Rev. A) 09 Jul 2010
More literature DDC11xEVM Readme Page Thank You Letter 07 Nov 2007
Application note Creating a Bipolar Input Range for the DDC112 27 Sep 2000
User guide DEM-DDC112U-C: Demonstration Fixture for the DDC112 27 Sep 2000
Application note Multi-DDC112 DUT Board for the DDC112 Evaluation Fixture 27 Sep 2000
Application note Retrieving Data from the DDC112 27 Sep 2000
Application note The DDC112\'s Test Mode 27 Sep 2000
Application note Understanding The DDC112\'S Continuous and Non-Continuous Modes 27 Sep 2000
Application note Using External Integration Capacitors on the DDC112 27 Sep 2000

Design & development

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Evaluation board

DDC11XEVM-PDK — DDC11xEVM-PDK Performance Demonstration Kit

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.

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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Gerber file

DDC112EVM Gerber

SBAC114.ZIP (240 KB)
Package Pins Download
SOIC (DW) 28 View options
TQFP (PJT) 32 View options

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