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Analog Devices Semiconductor Electronic Components Datasheet



AD673

8-Bit A/D Converter


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AD673 pdf
a
8-Bit A/D Converter
FEATURES
Complete 8-Bit A/D Converter with Reference, Clock
and Comparator
30 s Maximum Conversion Time
Full 8- or 16-Bit Microprocessor Bus Interface
Unipolar and Bipolar Inputs
No Missing Codes Over Temperature
Operates on +5 V and –12 V to –15 V Supplies
MIL-STD-883 Compliant Version Available
AD673*
FUNCTIONAL BLOCK DIAGRAM
VCC VSS
DIGITAL
COMMON CONVERT
ANALOG
IN
ANALOG
COMMON
5k
COMP-
ARATOR
BIPOLAR
OFFSET
CONTROL
8-BIT
CURRENT
OUTPUT
DAC
8-BIT
SAR
INT
CLOCK
MSB
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
LSB
DATA
ENABLE
GENERAL DESCRIPTION
The AD673 is a complete 8-bit successive approximation
analog-to-digital converter consisting of a DAC, voltage refer-
ence, clock, comparator, successive approximation register
(SAR) and 3-state output buffers—all fabricated on a single
chip. No external components are required to perform a full ac-
curacy 8-bit conversion in 20 µs.
The AD673 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 sub-surface Zener reference.
Operating on supplies of +5 V and –12 V to –15 V, the AD673
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 comple-
tion of the conversion.
The AD673 is available in two versions. The AD673J as speci-
fied over the 0°C to +70°C temperature range and the AD673S
guarantees ± 1/2 LSB relative accuracy and no missing codes
from –55°C to +125°C.
Two package configurations are offered. All versions are also of-
fered in a 20-pin hermetically sealed ceramic DIP. The AD673J
is also available in a 20-pin plastic DIP.
*Protected by U.S. Patent Nos. 3,940,760; 4,213,806; 4,136,349; 4,400,689;
and 4,400,690.
DATA
READY
BURIED ZENER REF
AD673
PRODUCT HIGHLIGHTS
1. The AD673 is a complete 8-bit A/D converter. No external
components are required to perform a conversion.
2. The AD673 interfaces to many popular microprocessors
without external buffers or peripheral interface adapters.
3. The device offers true 8-bit accuracy and exhibits no missing
codes over its entire operating temperature range.
4. The AD673 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 AD673 is available in a version compliant with MIL-
STD-883. Refer to the Analog Devices Military Products
Databook or current AD673/883B 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



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AD673 pdf
AD673–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
AD673J
AD673S
Min
Typ
Max Min
Typ
Max
Units
RESOLUTION
RELATIVE ACCURACY,l
TA = TMIN to TMAX
FULL-SCALE CALIBRATION2
UNIPOLAR OFFSET
BIPOLAR OFFSET
DIFFERENTIAL NONLINEARITY,3
TA = TMIN to TMAX
TEMPERATURE RANGE
TEMPERATURE COEFFICIENTS
Unipolar Offset
Bipolar Offset
Full-Scale Calibration2
POWER SUPPLY REJECTION
Positive Supply
+4.5 V+ +5.5 V
Negative Supply
–15.75 V V– –14.25 V
–12.6 V V– –11.4 V
ANALOG INPUT IMPEDANCE
ANALOG INPUT RANGES
Unipolar
Bipolar
OUTPUT CODING
Unipolar
Bipolar
LOGIC OUTPUT
Output Sink Current
(VOUT = 0.4 V max, TMIN to TMAX)
Output Source Current4
(VOUT = 2.4 V min, TMIN to TMAX)
Output Leakage
LOGIC INPUTS
Input Current
Logic “1”
Logic “0”
CONVERSION TIME, TA and
TMIN to TMAX
POWER SUPPLY
V+
V–
OPERATING CURRENT
V+
V–
8 8 Bits
؎1/2
؎1/2
؎1/2
؎1/2
LSB
LSB
± 2 ± 2 LSB
؎1/2
؎1/2
LSB
؎1/2
؎1/2
LSB
8 8 Bits
8 8 Bits
0
+70 –55
+125
°C
؎1 ؎1 LSB
؎1 ؎1 LSB
؎2 ؎2 LSB
؎2
؎2
؎2
3.0 5.0 7.0
0 +10
–5 +5
Positive True Binary
Positive True Offset Binary
؎2
؎2
؎2
3.0 5.0 7.0
0 +10
–5 +5
Positive True Binary
Positive True Offset Binary
LSB
LSB
LSB
k
V
V
3.2
0.5
2.0
10
+4.5
–11.4
20
+5.0
–15
15
9
؎40
؎100
0.8
30
+7.0
–16.5
20
15
3.2
0.5
2.0
10
+4.5
–11.4
20
+5.0
–15
15
9
؎40
؎100
0.8
30
+7.0
–16.5
20
15
mA
mA
µA
µA
V
V
µs
V
V
mA
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 200 potentiometer in place of the 15 fixed resistor.
Full scale is defined as 10 volts minus 1 LSB, or 9.961 V.
3Defined as the resolution for which no missing codes will occur.
4The 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 AD673
Description 8-Bit A/D Converter
Maker Analog Devices - Analog Devices
Total Page 8 Pages
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