12-Bit 100 kSPS
A/D Converter
a
AD1674*
FUNCTIO NAL BLO CK D IAGRAM
FEATURES
Com plete Monolithic 12-Bit 10 s Sam pling ADC
On-Board Sam ple-and-Hold Am plifier
Industry Standard Pinout
12/8
CS
STS
A
CONTROL
0
CE
8- and 16-Bit Microprocessor Interface
AC and DC Specified and Tested
Unipolar and Bipolar Inputs
R/C
10V
REF
CLOCK
SAR
REF OUT
12
؎5 V, ؎10 V, 0 V–10 V, 0 V–20 V Input Ranges
Com m ercial, Industrial and Military Tem perature
Range Grades
DB11 (MSB)
DB0 (LSB)
AGND
COMP
12
20k
REF IN
12
5k
10k
10k
MIL-STD-883 and SMD Com pliant Versions Available
BIP OFF
20V
IN
DAC
5k
2.5k
2.5k
10V
IN
IDAC
5k
SHA
AD1674
P RO D UCT D ESCRIP TIO N
P RO D UCT H IGH LIGH TS
T he AD1674 is a complete, multipurpose, 12-bit analog-to-
digital converter, consisting of a user-transparent onboard
sample-and-hold amplifier (SHA), 10 volt reference, clock and
three-state output buffers for microprocessor interface.
1. Industry Standard Pinout: T he AD1674 utilizes the pinout
established by the industry standard AD574A and AD674A.
2. Integrated SHA: T he AD1674 has an integrated SHA which
supports the full Nyquist bandwidth of the converter. T he
SHA function is transparent to the user; no wait-states are
needed for SHA acquisition.
T he AD1674 is pin compatible with the industry standard
AD574A and AD674A, but includes a sampling function while
delivering a faster conversion rate. T he on-chip SHA has a wide
input bandwidth supporting 12-bit accuracy over the full
Nyquist bandwidth of the converter.
3. DC and AC Specified: In addition to traditional dc specifica-
tions, the AD1674 is also fully specified for frequency do-
main ac parameters such as total harmonic distortion,
signal-to-noise ratio and input bandwidth. T hese parameters
can be tested and guaranteed as a result of the onboard
SHA.
T he AD1674 is fully specified for ac parameters (such as S/(N+D)
ratio, T H D, and IMD) and dc parameters (offset, full-scale
error, etc.). With both ac and dc specifications, the AD1674 is
ideal for use in signal processing and traditional dc measure-
ment applications.
4. Analog Operation: T he precision, laser-trimmed scaling and
bipolar offset resistors provide four calibrated ranges:
0 V to +10 V and 0 V to +20 V unipolar, –5 V to +5 V and
–10 V to +10 V bipolar. T he AD1674 operates on +5 V and
±12 V or ±15 V power supplies.
T he AD1674 design is implemented using Analog Devices’
BiMOS II process allowing high performance bipolar analog cir-
cuitry to be combined on the same die with digital CMOS logic.
Five different temperature grades are available. T he AD1674J
and K grades are specified for operation over the 0°C to +70°C
temperature range. T he A and B grades are specified from
–40°C to +85°C; the AD1674T grade is specified from –55°C
to +125°C. T he J and K grades are available in both 28-lead
plastic DIP and SOIC. T he A and B grade devices are available
in 28-lead hermetically sealed ceramic DIP and 28-lead SOIC.
T he T grade is available in 28-lead hermetically sealed ceramic
DIP.
5. Flexible Digital Interface: On-chip multiple-mode
three-state output buffers and interface logic allow direct
connection to most microprocessors.
*P r otected by U. S. P atent Nos. 4,962,325; 4,250,445; 4,808,908; RE 30586 .
REV. C
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norw ood, MA 02062-9106, U.S.A.
Tel: 617/ 329-4700
Fax: 617/ 326-8703
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