a 10-Bit A/D Converter AD573 FEATURES FUNCTIONAL BLOCK DIAGRAM Complete 10-Bit A/D Converter with Reference, Clock DIGITAL and Comparator V+ V COMMON CONVERT Full 8- or 16-Bit Microprocessor Bus Interface 5k MSB ANALOG Fast Successive Approximation Conversion20 ms typ DB9 IN DB8 No Missing Codes Over Temperature ANALOG COMMON 10-BIT 10-BIT DB7 CURRENT Operates on +5 V and 12 V to 15 V Supplies SAR OUTPUT DB6 HIGH DAC Low Cost Monolithic Construction BYTE DB5 COMP- ARATOR DB4 INT CLOCK BIPOLAR DB3 OFFSET CONTROL DB2 DB1 LOW BYTE DB0 LSB HBE BURIED ZENER REF LBE DATA AD573 READY PRODUCT DESCRIPTION The AD573 is a complete 10-bit successive approximation PRODUCT HIGHLIGHTS analog-to-digital converter consisting of a DAC, voltage refer- l. The AD573 is a complete 10-bit A/D converter. No external ence, clock, comparator, successive approximation register components are required to perform a conversion. (SAR) and three state output buffersall fabricated on a single 2. The AD573 interfaces to many popular microprocessors chip. No external components are required to perform a full without external buffers or peripheral interface adapters. The accuracy 10-bit conversion in 20 s. 10 bits of output data can be read as a 10-bit word or as 8- The AD573 incorporates advanced integrated circuit design and and 2-bit words. processing technologies. The successive approximation function 2 3. The device offers true 10-bit accuracy and exhibits no miss- is implemented with I L (integrated injection logic). Laser trim- ing codes over its entire operating temperature range. ming of the high stability SiCr thin-film resistor ladder network insures high accuracy, which is maintained with a temperature 4. The AD573 adapts to either unipolar (0 V to +10 V) or compensated subsurface Zener reference. bipolar (5 V to +5 V) analog inputs by simply grounding or opening a single pin. Operating on supplies of +5 V and 12 V to 15 V, the AD573 will accept analog inputs of 0 V to +10 V or 5 V to +5 V. The 5. Performance is guaranteed with +5 V and 12 V or 15 V trailing edge of a positive pulse on the CONVERT line initiates supplies. the 20 s conversion cycle. DATA READY indicates completion 6. The AD573 is available in a version compliant with MIL-STD- of the conversion. HIGH BYTE ENABLE (HBE) and LOW 883. Refer to the Analog Devices Military Products Data- BYTE ENABLE (LBE) control the 8-bit and 2-bit three state book or current /883B data sheet for detailed specifications. output buffers. The AD573 is available in two versions for the 0C to +70C temperature range, the AD573J and AD573K. The AD573S guarantees 1 LSB relative accuracy and no missing codes from 55C to +125C. Three package configurations are offered. All versions are offered in a 20-pin hermetically sealed ceramic DIP. The AD573J and AD573K are also available in a 20-pin plastic DIP or 20-pin leaded chip carrier. REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 Fax: 781.461.3113( T = +258C, V+ = +5 V, V = 12 V or 15 V, all voltages measured with respect A AD573SPECIFICATIONS to digital common, unless otherwise noted.) AD573J AD573K AD573S Model Min Typ Max Min Typ Max Min Typ Max Units RESOLUTION 10 10 10 Bits 1 RELATIVE ACCURACY 61 61/2 61 LSB T = T to T 61 61/2 61 LSB A MIN MAX 2 FULL-SCALE CALIBRATION 2 2 62 LSB UNIPOLAR OFFSET 61 61/2 61 LSB BIPOLAR OFFSET 61 61/2 61 LSB 3 DIFFERENTIAL NONLINEARITY 10 10 10 Bits T = T to T 910 10 Bits A MIN MAX TEMPERATURE RANGE 0 +70 0 +70 55 +125 C 4 TEMPERATURE COEFFICIENTS Unipolar Offset 62 61 62 LSB Bipolar Offset 62 61 62 LSB 2 Full-Scale Calibration 64 62 68 LSB POWER SUPPLY REJECTION Positive Supply +4.5 V V + +5.5 V 62 61 62 LSB Negative Supply 15.75 V V 14.25 V 62 61 62 LSB 12.6 V V 11.4 V 62 61 62 LSB ANALOG INPUT IMPEDANCE 3.0 5.0 7.0 3.0 5.0 7.0 3.0 5.0 7.0 k ANALOG INPUT RANGES Unipolar 0 +10 0 +10 0 +10 V Bipolar 5 +5 5 +5 5 +5 V OUTPUT CODING Unipolar Positive True Binary Positive True Binary Positive True Binary Bipolar Positive True Offset Binary Positive True Offset Binary Positive True Offset Binary LOGIC OUTPUT Output Sink Current (V = 0.4 V max, T to T ) 3.2 3.2 3.2 mA OUT MIN MAX 5 Output Source Current (V = 2.4 V min, T to T ) 0.5 0.5 0.5 mA OUT MIN MAX Output Leakage 640 640 640 A LOGIC INPUTS Input Current 6100 6100 6100 A Logic 1 2.0 2.0 2.0 V Logic 0 0.8 0.8 0.8 V CONVERSION TIME T = T to T 10 20 30 10 20 30 10 20 30 s A MIN MAX POWER SUPPLY V+ +4.5 5.0 +7.0 +4.5 +5.0 +7.0 +4.5 +5.0 +7.0 V V 11.4 15 16.5 +11.4 15 16.5 11.4 15 16.5 V OPERATING CURRENT V+ 15 20 15 20 15 20 mA V 9 15 9 15 9 15 mA NOTES 1 Relative accuracy is defined as the deviation of the code transition points from the ideal transfer point on a straight line from the zero to the full scale of the device. 2 Full-scale calibration is guaranteed trimmable to zero with an external 50 potentiometer in place of the 15 fixed resistor. Full scale is defined as 10 volts minus 1 LSB, or 9.990 volts. 3 Defined as the resolution for which no missing codes will occur. 4 Change from +25C value from +25C to T or T . MIN MAX 5 The data output lines have active pull-ups to source 0.5 mA. The DATA READY line is open collector with a nominal 6 k internal pull-up resistor. Specifications subject to change without notice. Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units. 2 REV. B