DDC101U ,20-Bit Analog-to-Digital ConverterFEATURESAPPLICATIONSl MONOLITHIC CHARGE INPUT ADC l DIRECT PHOTOSENSOR DIGITIZATIONl DIGITAL FILTER ..
DDC101UG4 ,20-Bit Analog-to-Digital Converter 24-SOIC block diagram is shown below. Duringtion architecture of the DDC101 to provide linearlyconversion, ..
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DDC101U-DDC101UG4
20-BIT ANALOG-TO-DIGITAL CONVERTER
® DDC101 20-BIT ANALOG-TO-DIGITAL CONVERTER FEATURES APPLICATIONS lMONOLITHIC CHARGE INPUT ADClDIRECT PHOTOSENSOR DIGITIZATION lDIGITAL FILTER NOISE REDUCTION:lPRECISION INSTRUMENTATION 0.9ppm, rms lINFRARED PYROMETRY lDIGITAL ERROR CORRECTION: CDSlPRECISION PROCESS CONTROL lCONVERSION RATE: Up to 15kHzlCT SCANNER DAS lUSER FRIENDLY EVALUATION FIXTURElCHEMICAL ANALYZERS DESCRIPTION The DDC101 is a precision, wide dynamic range, charge tion topology combines charge integration and digitiza- digitizing A/D converter with 20-bit resolution. Low tion functions. Oversampling and digital filtering reduce level current output devices, such as photosensors, can be system noise dramatically. Correlated Double Sampling directly connected to its input. The most stringent accu- (CDS) captures and eliminates steady state and conver- racy requirements of many unipolar output sensor appli- sion cycle dependent offset and switching errors that are cations occur at low signal levels. To meet this require- not eliminated with conventional analog circuits. ment, Burr-Brown developed the adaptive delta modula- The DDC101 block diagram is shown below. During tion architecture of the DDC101 to provide linearly conversion, the input signal is collected on the internal improving noise and linearity errors as the input signal integration capacitance for a user determined integration level decreases. The DDC101 combines the functions of period. A high precision, autozeroed comparator samples current-to-voltage conversion, integration, input program- the analog input node. Tracking logic updates the internal mable gain amplification, A/D conversion, and digital high resolution D/A converter at a 2MHz rate to maintain filtering to produce precision, wide dynamic range re- the analog input at virtual ground. A user programmable sults. The input signal can be a low level current con- digital filter oversamples the tracking logic’s output. The nected directly into the unit or a voltage connected digital filter passes a low noise, high resolution digital through a user selected resistor. Although the DDC101 is output to the serial I/O register. The serial outputs of optimized for unipolar signals, it can also accurately multiple DDC101 units can be easily connected together digitize bipolar input signals. The patented delta modula- in series or parallel if desired to minimize interconnections. +V DDC101 Integrated Circuit S Test In Test Current Reset CDAC C 18 Bits INT DAC Analog 20 Bits Digital Integration, Input Digital Filter and Serial In Serial I/O Tracking and Error Correction Register Serial Out Control Logic Ground Comparator Oversampled Digital Out V Setup REF International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111 Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 © 1993 Burr-Brown Corporation PDS-1211E Printed in U.S.A. March, 1998 SBAS029 DDC101
