(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
2
L (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.
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
T =
= +5 V– = –12 V or –15
AD573–SPECIFICATIONS
(@digital+25 C, V+ unlessV,otherwise noted.) V, all voltages measured with respect
to
common,
A
Model
RESOLUTION
RELATIVE ACCURACY
T
A
= T
MIN
to T
MAX
UNIPOLAR OFFSET
BIPOLAR OFFSET
DIFFERENTIAL NONLINEARITY
3
T
A
= T
MIN
to T
MAX
TEMPERATURE RANGE
TEMPERATURE COEFFICIENTS
Unipolar Offset
Bipolar Offset
Full-Scale Calibration
2
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
ANALOG INPUT IMPEDANCE
ANALOG INPUT RANGES
Unipolar
Bipolar
OUTPUT CODING
Unipolar
Bipolar
LOGIC OUTPUT
Output Sink Current
(V
OUT
= 0.4 V max, T
MIN
to T
MAX
)
Output Source Current
5
(V
OUT
= 2.4 V min, T
MIN
to T
MAX
)
Output Leakage
LOGIC INPUTS
Input Current
Logic “1”
Logic “0”
CONVERSION TIME
T
A
= T
MIN
to T
MAX
POWER SUPPLY
V+
V–
OPERATING CURRENT
V+
V–
4
1
Min
AD573J
Typ
10
Max
1
1
Min
AD573K
Typ
10
Max
1/2
1/2
Min
AD573S
Typ
10
Max
1
1
2
1
1
Units
Bits
LSB
LSB
LSB
LSB
LSB
Bits
Bits
FULL-SCALE CALIBRATION
2
±
2
1
1
10
9
0
+70
2
2
4
10
10
0
±
2
1/2
1/2
10
10
+70
1
1
2
–55
+125
2
2
5
°C
LSB
LSB
LSB
2
2
2
3.0
0
–5
5.0
7.0
+10
+5
3.0
0
–5
5.0
1
1
1
7.0
+10
+5
3.0
0
–5
5.0
2
2
2
7.0
+10
+5
LSB
LSB
LSB
kΩ
V
V
Positive True Binary
Positive True Offset Binary
Positive True Binary
Positive True Offset Binary
Positive True Binary
Positive True Offset Binary
3.2
0.5
40
100
2.0
0.8
10
+4.5
–11.4
20
5.0
–15
15
9
30
+7.0
–16.5
20
15
3.2
0.5
40
100
2.0
0.8
10
+4.5
+11.4
20
+5.0
–15
15
9
30
+7.0
–16.5
20
15
3.2
0.5
40
100
2.0
0.8
10
+4.5
–11.4
20
+5.0
–15
15
9
30
+7.0
–16.5
20
15
mA
mA
µA
µA
V
V
µs
V
V
mA
mA
NOTES
1
Relative 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.
2
Full-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.
3
Defined as the resolution for which no missing codes will occur.
4
Change from +25°C value from +25°C to T
MIN
or T
MAX
.
5
The data output lines have active pull-ups to source 0.5 mA. The
DATA READY
line is open collector with a nominal 6 kΩ 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.
–2–
REV. A
AD573
ABSOLUTE MAXIMUM RATINGS
V+ to Digital Common . . . . . . . . . . . . . . . . . . . . . 0 V to +7 V
V– to Digital Common . . . . . . . . . . . . . . . . . . . 0 V to –16.5 V
Analog Common to Digital Common . . . . . . . . . . . . . . .
±
1 V
Analog Input to Analog Common . . . . . . . . . . . . . . . . .
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