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DDC112, dual current-input, 20-bit, a/d converter adc
DDC112Y, Dual Current-Input 20-Bit Analog-to-Digital Converter (ADC), 32 pin TQFP, Burr Brown/Texas Instruments.
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.
* MONOLITHIC CHARGE MEASUREMENT ADC
* DIGITAL FILTER NOISE REDUCTION: 3.2ppm, rms
* INTEGRAL LINEARITY: 0.005% Reading 0.5ppm FSR
* HIGH PRECISION,TRUE INTEGRATING FUNCTION
* DIRECT PHOTOSENSOR DIGITIZATION
