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Analog Devices Semiconductor Electronic Components Datasheet

AD573 Datasheet

10-Bit A/D Converter

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AD573 pdf
a
10-Bit A/D Converter
AD573*
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 s 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 I2L (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.
FUNCTIONAL BLOCK DIAGRAM
V+ V–
DIGITAL
COMMON CONVERT
ANALOG
IN
ANALOG
COMMON
5k
COMP-
ARATOR
BIPOLAR
OFFSET
CONTROL
10-BIT
CURRENT
OUTPUT
DAC
10-BIT
SAR
INT
CLOCK
DATA
READY
BURIED ZENER REF
AD573
MSB
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
HIGH
BYTE
DB1
DB0
LSB
LOW
BYTE
HBE
LBE
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.
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD573 Datasheet

10-Bit A/D Converter

No Preview Available !

AD573 pdf
AD573–SPECIFICATIONS (@ TA = +25؇C, V+ = +5 V, V– = –12 V or –15 V, all voltages measured with respect
to digital common, unless otherwise noted.)
Model
AD573J
Min Typ
Max
AD573K
Min Typ Max
AD573S
Min Typ
Max
Units
RESOLUTION
10 10 10 Bits
RELATIVE ACCURACY1
TA = TMIN to TMAX
FULL-SCALE CALIBRATION2
؎1
؎1
±2
؎1/2
؎1/2
±2
؎1 LSB
؎1 LSB
؎2 LSB
UNIPOLAR OFFSET
؎1
؎1/2
؎1 LSB
BIPOLAR OFFSET
؎1
؎1/2
؎1 LSB
DIFFERENTIAL NONLINEARITY3
TA = TMIN to TMAX
TEMPERATURE RANGE
TEMPERATURE COEFFICIENTS4
Unipolar Offset
Bipolar Offset
Full-Scale Calibration2
10
9
0
10
10
+70 0
؎2
؎2
؎4
10
10
+70 –55
؎1
؎1
؎2
+125
؎2
؎2
؎5
Bits
Bits
°C
LSB
LSB
LSB
POWER SUPPLY REJECTION
Positive Supply
+4.5 V V + +5.5 V
Negative Supply
–15.75 V V – –14.25 V
–12.6 V V – –11.4 V
؎2 ؎1 ؎2 LSB
؎2 ؎1 ؎2 LSB
؎2 ؎1 ؎2 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
Bipolar
0 +10 0 +10 0 +10 V
–5 +5 –5 +5 –5 +5 V
OUTPUT CODING
Unipolar
Bipolar
Positive True Binary
Positive True Offset Binary
Positive True Binary
Positive True Offset Binary
Positive True Binary
Positive True Offset Binary
LOGIC OUTPUT
Output Sink Current
(VOUT = 0.4 V max, TMIN to TMAX)
Output Source Current5
(VOUT = 2.4 V min, TMIN to TMAX)
Output Leakage
3.2
0.5
3.2
0.5
؎40
3.2
0.5
؎40
mA
mA
؎40 µA
LOGIC INPUTS
Input Current
Logic “1”
Logic “0”
؎100
؎100
؎100 µA
2.0 2.0 2.0 V
0.8 0.8 0.8 V
CONVERSION TIME
TA = TMIN to TMAX
POWER SUPPLY
V+
V–
10 20
+4.5
–11.4
5.0
–15
30 10 20
+7.0
–16.5
+4.5
+11.4
+5.0
–15
30 10 20
+7.0
–16.5
+4.5
–11.4
+5.0
–15
30 µs
+7.0
–16.5
V
V
OPERATING CURRENT
V+
V–
15 20
9 15
15 20
9 15
15 20 mA
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 potentiometer in place of the 15 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 kinternal 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. A


Part Number AD573
Description 10-Bit A/D Converter
Maker Analog Devices
Total Page 8 Pages
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