DDC112U/1K ,Dual Current Input 20-Bit Analog-To-Digital ConverterMAXIMUM RATINGSELECTROSTATICAV to DV ........ –0.3V to +6VDD DDDISCHARGE SENSITIVITYAV to AGND .... ..
DDC112UG4 ,Dual Current Input 20-Bit Analog-To-Digital Converter 28-SOIC -40 to 85Maximum Ratings maycause permanent damage to the device. Exposure to absolute maximum specification ..
DDC112UK ,Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTERFEATURES DESCRIPTION* MONOLITHIC CHARGE MEASUREMENT A/D The DDC112 is a dual input, wide dynamic ra ..
DDC112UKG4 ,Dual Current Input 20-Bit Analog-To-Digital Converter 28-SOIC 0 to 70PIN CONFIGURATION PIN DESCRIPTIONSPIN LABEL DESCRIPTIONTop View SO1 IN1 Input 1: analog input for I ..
DDC112Y , Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER
DDC112Y/250 ,Dual Current Input 20-Bit Analog-To-Digital ConverterFEATURES DESCRIPTION* MONOLITHIC CHARGE MEASUREMENT A/D The DDC112 is a dual input, wide dynamic ra ..
DMC80C49 , CMOS SINGLE-COMPONENT 8-BIT MICROCOMPUTER
DMD5603 , 10CH SELECTOR FOR CORDLESSPHONE
DMD5802 , UNIVERSAL PROGRAMMABLE DUAL PLL
DMF3945-103 , Chip On Board Mixer Quads
DMG1024UV-7 , DUAL N-CHANNEL ENHANCEMENT MODE MOSFET
DMG2302U , N-CHANNEL ENHANCEMENT MODE MOSFET Low On-Resistance
DDC112U-DDC112U/1K-DDC112UG4-DDC112UK-DDC112UKG4-DDC112Y/250-DDC112Y/250G4
Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER
DDC112
Dual Current Input 20-Bit
ANALOG-TO-DIGITAL CONVERTER
FEA TURES MONOLITHIC CHARGE MEASUREMENT A/D
CONVERTER DIGITAL FILTER NOISE REDUCTION:
3.2ppm, rms INTEGRAL LINEARITY:±0.005% Reading ±0.5ppm FSR
HIGH PRECISION, TRUE INTEGRATING FUNC-
TION PROGRAMMABLE FULL-SCALE SINGLE SUPPLY CASCADABLE OUTPUT
APPLICATIONS DIRECT PHOTOSENSOR DIGITIZATION CT SCANNER DAS INFRARED PYROMETER PRECISION PROCESS CONTROL LIQUID/GAS CHROMATOGRAPHY BLOOD ANALYSIS
DESCRIPTIONThe DDC112 is a dual input, wide dynamic range, charge-
digitizing analog-to-digital (A/D) converter with 20-bit resolu-
tion. 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 integrat-
ing 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 com-
pared 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 an SO-28 or TQFP-32 package and is
offered in two performance grades.
Protected by US Patent #5841310
DVALID
DXMIT
DOUT
DIN
DCLK
RANGE2
RANGE1
RANGE0
TEST CONV CLK
CAP1A
CAP1A
CAP1B
CAP1B
CAP2A
CAP2A
CAP2B
CAP2B
IN2
IN1
VREF DGNDDVDDAGNDAVDD
SBAS085B – JANUARY 2000 – REVISED OCTOBER 2004
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
