a
FEATURES
Complete A/D Converter with Reference and Clock
Fast Successive Approximation Conversion: 40 s max
No Missing Codes Over Temperature
0 C to +70 C: AD571K
–55 C to +125 C: AD571S
Digital Multiplexing: Three-State Outputs
18-Pin Ceramic DIP
Low Cost Monolithic Construction
V+
10
10-Bit A/D Converter
AD571*
FUNCTIONAL BLOCK DIAGRAM
V–
12
5k
DIGITAL
COMMON
16
BLANK &
CONVERT
CONTROL
11
B&
C
ANALOG
13
IN
ANALOG
14
COMMON
9
MSB
8
7
10-BIT
SAR
10-BIT
CURRENT
OUTPUT
DAC
INT.
CLOCK
6
5
4
3
2
COMPARATOR
BIT
OUTPUTS
BIPOLAR
OFFSET
15
CONTROL
DATA
READY
1
18
LSB
3 STATE
BUFFERS
AUTO BLANK
CONTROL
PRODUCT DESCRIPTION
The AD571 is an 10-bit successive approximation A/D con-
verter consisting of a DAC, voltage reference, clock, compara-
tor, successive approximation register and output buffers—all
fabricated on a single chip. No external components are re-
quired to perform a full accuracy 10-bit conversion in 40
µs.
Operating on supplies of +5 V to +15 V and –15 V, the
AD571 will accepts analog inputs of 0 V to +10 V unipolar of
±
5 V bipolar, externally selectable. When the BLANK and
CONVERT
input is driven low, the three-state outputs will be
open and a conversion will commence. Upon completion of the
conversion, the
DATA READY
line goes low and the data ap-
pears at the output. Pulling the BLANK and
CONVERT
input
high blanks the outputs and readies the device for the next con-
version. The AD571 executes a true 10-bit conversion with no
missing codes in 40
µs
maximum.
The AD571 is available in two version for the 0°C to +70°C
temperature range, the AD571J and K. The AD571S guarantees
10-bit accuracy and no missing codes from –55°C to +125°C.
*Covered
by Patent Nos. 3,940,760; 4,213,806; 4,136,349.
TEMPERATURE COMPENSATED
BURIED ZENER REFERENCE
AND DAC CONTROL
17
AD571
DATA READY
PRODUCT HIGHLIGHTS
1. The AD571 is a complete 10-bit A/D converter. No external
components are required to perform a conversion. Full-scale
calibration accuracy of
±
0.3% is achieved without external
trims.
2. The AD571 is a single chip device employing the most ad-
vanced IC processing techniques. Thus, the user has at his
disposal a truly precision component with the reliability and
low cost inherent in monolithic construction,
3. The AD571 accepts either unipolar (0 V to +10 V) or bipolar
(–5 V to +5 V) analog inputs by grounding or opening a
single pin.
4. The device offers true 10-bit accuracy and exhibits no miss-
ing codes over its entire operating temperature range.
5. Operation is guaranteed with –15 V and +5 V or +15 V sup-
plies. The device will also operate with a –12 V supply.
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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