AD573JD

AD573 AD | Alldatasheet

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V+ V– DIGITAL COMMON CONVERT INT CLOCK 10-BIT SAR DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0 HBE LBE MSB LSB LOW BYTE ANALOG COMMON BIPOLAR OFFSET CONTROL DATA READY AD573 REV. A 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a 10-Bit A/D Converter AD573* Tel: 617/329-4700 Fax: 617/326-8703

FEATURES

Complete 10-Bit A/D Converter with Reference, Clock and Comparator Full 8- or 16-Bit Microprocessor Bus Interface Fast Successive Approximation Conversion—20 ms typ No Missing Codes Over Temperature Operates on +5 V and –12 V to –15 V Supplies Low Cost Monolithic Construction PRODUCT DESCRIPTION The AD573 is a complete 10-bit successive approximation analog-to-digital converter consisting of a DAC, voltage refer- ence, clock, comparator, successive approximation register (SAR) and three state output buffers—all fabricated on a single chip. No external components are required to perform a full accuracy 10-bit conversion in 20 µs. The AD573 incorporates advanced integrated circuit design and processing technologies. The successive approximation function is implemented with I 2L (integrated injection logic). Laser trim- ming of the high stability SiCr thin-film resistor ladder network insures high accuracy, which is maintained with a temperature compensated subsurface Zener reference. 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 trailing edge of a positive pulse on the CONVERT line initiates the 20 µs conversion cycle. DATA READY indicates completion of the conversion. HIGH BYTE ENABLE (HBE) and LOW BYTE ENABLE (LBE) control the 8-bit and 2-bit three state output buffers. The AD573 is available in two versions for the 0 °C to +70°C temperature range, the AD573J and AD573K. The AD573S guarantees ± 1 LSB relative accuracy and no missing codes from –55°C to +125°C. 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. *Protected by U.S. Patent Nos. 3,940,760; 4,213,806; 4,136,349; 4,400,689; and 4,400,690. PRODUCT HIGHLIGHTS l. The AD573 is a complete 10-bit A/D converter. No external components are required to perform a conversion. 2. The AD573 interfaces to many popular microprocessors without external buffers or peripheral interface adapters. The 10 bits of output data can be read as a 10-bit word or as 8- and 2-bit words. 3. The device offers true 10-bit accuracy and exhibits no miss- ing codes over its entire operating temperature range. 4. The AD573 adapts to either unipolar (0 V to +10 V) or bipolar (–5 V to +5 V) analog inputs by simply grounding or opening a single pin. 5. Performance is guaranteed with +5 V and –12 V or –15 V supplies. 6. The AD573 is available in a version compliant with MIL-STD- 883. Refer to the Analog Devices Military Products Data- book or current /883B data sheet for detailed specifications.

AD573–SPECIFICATIONS (@ TA = +258C, V+ = +5 V, V– = –12 V or –15 V, all voltages measured with respect 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 RELATIVE ACCURACY 1 61 61/2 61 LSB TA = TMIN to TMAX 61 61/2 61 LSB FULL-SCALE CALIBRATION 2 ± 2 ± 2 62 LSB UNIPOLAR OFFSET 61 61/2 61 LSB BIPOLAR OFFSET 61 61/2 61 LSB DIFFERENTIAL NONLINEARITY 3 10 10 10 Bits TA = TMIN to TMAX 91 0 1 0 Bits TEMPERATURE RANGE 0 +70 0 +70 –55 +125 °C TEMPERATURE COEFFICIENTS 4 Unipolar Offset 62 61 62 LSB Bipolar Offset 62 61 62 LSB Full-Scale Calibration 2 64 62 65 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 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 (VOUT = 0.4 V max, T MIN to TMAX) 3.2 3.2 3.2 mA Output Source Current 5 (VOUT = 2.4 V min, T MIN to TMAX) 0.5 0.5 0.5 mA Output Leakage 640 640 640 µA LOGIC INPUTS Input Current 6100 6100 6100 µA Logic “1” 2.0 2.0 2.0 V Logic “0” 0.8 0.8 0.8 V CONVERSION TIME TA = TMIN to TMAX 10 20 30 10 20 30 10 20 30 µs POWER SUPPLY OPERATING CURRENT V+ 15 20 15 20 15 20 mA V– 9 15 9 15 9 15 mA NOTES 1Relative 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. 2Full-scale calibration is guaranteed trimmable to zero with an external 50 Ω potentiometer in place of the 15 Ω fixed resistor. Full scale is defined as 10 volts minus 1 LSB, or 9.990 volts. 3Defined as the resolution for which no missing codes will occur. 4Change from +25 °C value from +25 °C to TMIN or TMAX. 5The data output lines have active pull-ups to source 0.5 mA. The DATA READY line is open collector with a nominal 6 k Ω 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. REV. A–2–

2D = Ceramic DIP; N = Plastic DIP; P = Plastic Leaded Chip Carrier. represents the input signal to within 1/2 LSB (0.05% of full scale). Figure 1. Functional Block Diagram and –12 V to –15 V), the analog input and the convert pulse. functional pinout is shown in Figure 2.

and will typically operate with a pulse as short as 300 ns. will vary slightly in width. The AD573 output data is presented in a left justified format. organization of the data is shown in Figure 14. six remaining bits of the byte will contain meaningless data. Logic 0 while preserving the two most significant bits of the byte. Figure 14. AD573 Output Data Format the low end for right justification. terface adapter chips are available. Figure 15. AD573 in “Stand-Alone“ Mode

1 MHz 6502 microprocessor, meets all timing requirements for

recommended connections are shown in Figure 16. Figure 16. AD573 Interface to Apple ll sumes that the AD573 is connected for a ± 5 volt input range.

100 PRINT “WHICH SLOT IS THE A/D IN”;:INPUT S

110 A=49280 + 16*S

120 POKE A,0

130 L=PEEK(A) :H=PEEK(A+1)

140 I =(4*H) + INT(L/64)

C841–9–5/84PRINTED IN U.S.A. number greater than or equal to two. The AD573 can also be used with 8085-series microprocessors. enough CONVERT pulse when the 8085 is running at 5 MHz. be approximately 500 ns wide. been provided in the basic system design. Figure 17. AD573–8085A Interface Connections Dimensions shown in inches and (mm).