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 V_REF. When the integration capacitor is reset at the beginning of each integration cycle, the capacitor charges to V_REF. This charge is removed in proportion to the input current. At the end of the integration cycle, the remaining voltage is compared to V_REF.

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.

• 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.

• 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
• Rating
• Catalog

DDC112的完整型号有：DDC112U、DDC112U/1K、DDC112UK、DDC112Y/250、DDC112Y/2K、DDC112YK/250，以下是这些产品的关键参数及官网采购报价：

DDC112U，工作温度：-40 to 85，封装：SOIC (DW)-28，包装数量MPQ：20个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网DDC112U的批量USD价格：14.197（1000+）

DDC112U/1K，工作温度：-40 to 85，封装：SOIC (DW)-28，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网DDC112U/1K的批量USD价格：12.197（1000+）

DDC112UK，工作温度：0 to 70，封装：SOIC (DW)-28，包装数量MPQ：20个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网DDC112UK的批量USD价格：12.197（1000+）

DDC112Y/250，工作温度：-40 to 85，封装：TQFP (PJT)-32，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网DDC112Y/250的批量USD价格：16.23（1000+）

DDC112Y/2K，工作温度：-40 to 85，封装：TQFP (PJT)-32，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网DDC112Y/2K的批量USD价格：14.23（1000+）

DDC112YK/250，工作温度：0 to 70，封装：TQFP (PJT)-32，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网DDC112YK/250的批量USD价格：14.23（1000+）

DDC11XEVM-PDK — DDC11xEVM-PDK 性能演示套件

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.

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