DDC112

現行

雙電流輸入 20 位元類比轉數位轉換器

產品詳細資料

Number of input channels 2 Resolution (Bits) 20 Features Computed Tomography (CT) Operating temperature range (°C) -40 to 85 Interface type Serial Rating Catalog
Number of input channels 2 Resolution (Bits) 20 Features Computed Tomography (CT) Operating temperature range (°C) -40 to 85 Interface type Serial Rating Catalog
SOIC (DW) 28 184.37 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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技術文件

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類型 標題 日期
* Data sheet DDC112: Dual Current Input 20-Bit Analog-To-Digital Converter datasheet (Rev. B) 2004年 10月 6日
Technical article Designing signal chains for portable diagnostics PDF | HTML 2022年 5月 18日
Analog Design Journal Selecting a multichannel ultra-low-current measurement IC PDF | HTML 2022年 3月 18日
Technical article Helping physicians achieve faster, more accurate patient diagnoses with molecular PDF | HTML 2020年 5月 20日
EVM User's guide DDC11xEVM-PDK User's Guide (Rev. A) 2010年 7月 9日
More literature DDC11xEVM Readme Page Thank You Letter 2007年 11月 7日
Application note Creating a Bipolar Input Range for the DDC112 2000年 9月 27日
User guide DEM-DDC112U-C: Demonstration Fixture for the DDC112 2000年 9月 27日
Application note Multi-DDC112 DUT Board for the DDC112 Evaluation Fixture 2000年 9月 27日
Application note Retrieving Data from the DDC112 2000年 9月 27日
Application note The DDC112\'s Test Mode 2000年 9月 27日
Application note Understanding The DDC112\'S Continuous and Non-Continuous Modes 2000年 9月 27日
Application note Using External Integration Capacitors on the DDC112 2000年 9月 27日

設計與開發

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開發板

DDC11XEVM-PDK — DDC11xEVM-PDK 性能展示套件

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.

使用指南: PDF
TI.com 無法提供
Gerber 檔案

DDC112EVM Gerber

SBAC114.ZIP (240 KB)
模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

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 (...)
封裝 針腳 CAD 符號、佔位空間與 3D 模型
SOIC (DW) 28 Ultra Librarian
TQFP (PJT) 32 Ultra Librarian

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