DDC112 Status: ACTIVE

Product Information

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.

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 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.