AD673JD Analog Devices Inc, AD673JD Datasheet

IC ADC 8BIT W/REF/CLK/COMP 20DIP

AD673JD

Manufacturer Part Number
AD673JD
Description
IC ADC 8BIT W/REF/CLK/COMP 20DIP
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD673JD

Rohs Status
RoHS non-compliant
Number Of Bits
8
Sampling Rate (per Second)
33k
Data Interface
Parallel
Number Of Converters
1
Voltage Supply Source
Dual ±
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
20-CDIP (0.300", 7.62mm)

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
AD673JD
Manufacturer:
ADI
Quantity:
425
a
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 s.
The AD673 incorporates advanced integrated circuit design and
processing technologies. The successive approximation function
is implemented with I
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 s 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.
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.
FEATURES
Complete 8-Bit A/D Converter with Reference, Clock
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
and Comparator
2
L (integrated injection logic). Laser trim-
PRODUCT HIGHLIGHTS
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
1. The AD673 is a complete 8-bit A/D converter. No external
2. The AD673 interfaces to many popular microprocessors
3. The device offers true 8-bit accuracy and exhibits no missing
4. The AD673 adapts to either unipolar (0 V to +10 V) or
5. Performance is guaranteed with +5 V and –12 V or –15 V
6. The AD673 is available in a version compliant with MIL-
components are required to perform a conversion.
without external buffers or peripheral interface adapters.
codes over its entire operating temperature range.
bipolar (–5 V to +5 V) analog inputs by simply grounding or
opening a single pin.
supplies.
STD-883. Refer to the Analog Devices Military Products
Databook or current AD673/883B data sheet for detailed
specifications.
CONTROL
COMMON
BIPOLAR
ANALOG
ANALOG
OFFSET
READY
DATA
IN
FUNCTIONAL BLOCK DIAGRAM
COMP-
ARATOR
V
5k
CC
BURIED ZENER REF
V
SS
8-Bit A/D Converter
CURRENT
OUTPUT
8-BIT
DAC
COMMON
DIGITAL
CLOCK
8-BIT
SAR
INT
CONVERT
AD673
AD673
Fax: 617/326-8703
MSB
LSB
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
DATA
ENABLE

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AD673JD Summary of contents

Page 1

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 and – ...

Page 2

AD673–SPECIFICATIONS Model RESOLUTION l RELATIVE ACCURACY MIN MAX 2 FULL-SCALE CALIBRATION UNIPOLAR OFFSET BIPOLAR OFFSET DIFFERENTIAL NONLINEARITY MIN MAX TEMPERATURE RANGE TEMPERATURE COEFFICIENTS Unipolar Offset Bipolar Offset 2 ...

Page 3

... V– to Digital Common . . . . . . . . . . . . . . . . . . . –16.5 V Analog Common to Digital Common . . . . . . . . . . . . . . . Analog Input to Analog Common . . . . . . . . . . . . . . . . . Control Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Digital Outputs (High Impedance State Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 mW Model AD673JN AD673JD 2 AD673SD AD673JP NOTES Ceramic DIP Plastic DIP Plastic Leaded Chip Carrier. 2 For details on grade and package offering screened in accordance with MIL-STD-883, refer to the Analog Devices Military Products Databook ...

Page 4

AD673 Full-Scale Calibration The 5 k thin-film input resistor is laser trimmed to produce a current which matches the full-scale current of the internal DAC-plus about 0.3%—when an analog input voltage of 9.961 volts (10 volts – 1 LSB) is ...

Page 5

BIPOLAR CONNECTION To obtain the bipolar – range with an offset binary output code, the bipolar offset control pin is left open. A –5.00 volt signal will give a 8-bit code of 00000000; an input of ...

Page 6

AD673 GROUNDING CONSIDERATIONS The AD673 provides separate Analog and Digital Common connections. The circuit will operate properly with as much as 200 mV of common-mode voltage between the two commons. This permits more flexible control of system common bussing and ...

Page 7

In systems where this read-write interface is used, at least 30 microseconds (the maximum conversion time) must be al- lowed to pass between starting a conversion and reading the re- sults. This delay or “time-out” period can be implemented in ...

Page 8

AD673 OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 20-Pin Ceramic DIP (D-20) 20-Pin Plastic DIP (N-20) –8– REV. A ...

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