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Analog Devices Semiconductor Electronic Components Datasheet



AD670

Low Cost Signal Conditioning 8-Bit ADC



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AD670 pdf
a
FEATURES
Complete 8-Bit Signal Conditioning A/D Converter
Including Instrumentation Amp and Reference
Microprocessor Bus Interface
10 s Conversion Speed
Flexible Input Stage: Instrumentation Amp Front End
Provides Differential Inputs and High Common-Mode
Rejection
No User Trims Required
No Missing Codes Over Temperature
Single +5 V Supply Operation
Convenient Input Ranges
20-Pin DIP or Surface-Mount Package
Low Cost Monolithic Construction
MIL-STD-883B Compliant Versions Available
Low Cost Signal
Conditioning 8-Bit ADC
AD670
FUNCTIONAL BLOCK DIAGRAM
GENERAL DESCRIPTION
The AD670 is a complete 8-bit signal conditioning analog-
to-digital converter. It consists of an instrumentation amplifier
front end along with a DAC, comparator, successive approxima-
tion register (SAR), precision voltage reference, and a three-
state output buffer on a single monolithic chip. No external
components or user trims are required to interface, with full
accuracy, an analog system to an 8-bit data bus. The AD670
will operate on the +5 V system supply. The input stage pro-
vides differential inputs with excellent common-mode rejection
and allows direct interface to a variety of transducers.
The device is configured with input scaling resistors to permit
two input ranges: 0 mV to 255 mV (1 mV/LSB) and 0 to 2.55 V
(10 mV/LSB). The AD670 can be configured for both unipolar
and bipolar inputs over these ranges. The differential inputs and
common-mode rejection of this front end are useful in applica-
tions such as conversion of transducer signals superimposed on
common-mode voltages.
The AD670 incorporates advanced circuit design and proven
processing technology. The successive approximation function
is implemented with I2L (integrated injection logic). Thin-film
SiCr resistors provide the stability required to prevent missing
codes over the entire operating temperature range while laser
wafer trimming of the resistor ladder permits calibration of the
device to within ± 1 LSB. Thus, no user trims for gain or offset
are required. Conversion time of the device is 10 µs.
The AD670 is available in four package types and five grades.
The J and K grades are specified over 0°C to +70°C and come
in 20-pin plastic DIP packages or 20-terminal PLCC packages.
The A and B grades (–40°C to +85°C) and the S grade (–55°C
to +125°C) come in 20-pin ceramic DIP packages.
The S grade is also available with optional processing to
MIL-STD-883 in 20-pin ceramic DIP or 20-terminal LCC
packages. The Analog Devices Military Products Databook
should be consulted for detailed specifications.
PRODUCT HIGHLIGHTS
1. The AD670 is a complete 8-bit A/D including three-state
outputs and microprocessor control for direct connection to
8-bit data buses. No external components are required to
perform a conversion.
2. The flexible input stage features a differential instrumenta-
tion amp input with excellent common-mode rejection. This
allows direct interface to a variety of transducers without
preamplification.
3. No user trims are required for 8-bit accurate performance.
4. Operation from a single +5 V supply allows the AD670 to
run off of the microprocessor’s supply.
5. Four convenient input ranges (two unipolar and two bipolar)
are available through internal scaling resistors: 0 mV to
255 mV (1 mV/LSB) and 0 V to 2.55 V (10 mV/LSB).
6. Software control of the output mode is provided. The user
can easily select unipolar or bipolar inputs and binary or 2s
complement output codes.
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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AD670 pdf
AD670–SPECIFICATIONS (@ VCC = +5 V and +25؇C, unless otherwise noted)
Model
AD670J
Min Typ
Max
AD670K
Min Typ
Max
Units
OPERATING TEMPERATURE RANGE
0
+70 0
+70 °C
RESOLUTION 8 8 Bit
CONVERSION TIME
10 10 µs
RELATIVE ACCURACY
TMIN to TMAX
DIFFERENTIAL LINEARITY ERROR1
TMIN to TMAX
GAIN ACCURACY
@ +25°C
TMIN to TMAX
UNIPOLAR ZERO ERROR
@ +25°C
TMIN to TMAX
BIPOLAR ZERO ERROR
@ +25°C
TMIN to TMAX
ANALOG INPUT RANGES
DIFFERENTIAL (–VIN to +VIN)
Low Range
High Range
ABSOLUTE (Inputs to Power GND)
Low Range TMIN to TMAX
High Range TMIN to TMAX
BIAS CURRENT (255 mV RANGE)
TMIN to TMAX
OFFSET CURRENT (255 mV RANGE)
TMIN to TMAX
2.55 V RANGE INPUT RESISTANCE
؎1/2
؎l/2
؎1/4
؎1/2
GUARANTEED NO MISSING CODES ALL GRADES
؎1.5
؎2.0
؎0.75
؎1.0
؎1.5
؎2.0
؎0.75
؎1.0
؎1.5
؎2.0
؎0.75
؎1.0
LSB
LSB
LSB
LSB
LSB
LSB
LSB
LSB
0 to +255
–128 to +127
0 to +2.55
–1.28 to +1.27
–0.150
–1.50
VCC – 3.4
VCC
200 500
40
8.0
200
12.0
–0.150
–1.50
0 to +255
–128 to +127
0 to +2.55
–1.28 to +1.27
VCC – 3.4
VCC
200 500
40
8.0
200
12.0
mV
mV
V
V
V
V
nA
nA
k
2.55 V RANGE FULL-SCALE MATCH
+ AND – INPUT
± 1/2
± 1/2 LSB
COMMON-MODE REJECTION
RATIO (255 mV RANGE)
1 1 LSB
COMMON-MODE REJECTION
RATIO (2.55 V RANGE)
1 1 LSB
POWER SUPPLY
Operating Range
Current ICC
Rejection Ratio TMIN to TMAX
DIGITAL OUTPUTS
SINK CURRENT (VOUT = 0.4 V)
TMIN to TMAX
SOURCE CURRENT (VOUT = 2.4 V)
TMIN to TMAX
THREE-STATE LEAKAGE CURRENT
4.5
30
1.6
0.5
5.5
45
0.015
؎40
4.5
30
1.6
0.5
5.5
45
0.015
؎40
V
mA
% of FS/%
mA
mA
µA
OUTPUT CAPACITANCE
5
5 pF
DIGITAL INPUT VOLTAGE
VINL
VINH
DIGITAL INPUT CURRENT
(0 VIN +5 V)
IINL
IINH
INPUT CAPACITANCE
2.0
–100
10
0.8
+100
2.0
–100
10
0.8
+100
V
V
µA
µA
pF
NOTES
1Tested at VCC = 4 5 V, 5.0 V and 5.5 V.
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.
Specifications subject to change without notice.
–2– REV. A



Part Number AD670
Description Low Cost Signal Conditioning 8-Bit ADC
Maker Analog Devices - Analog Devices
Total Page 12 Pages
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