DAC14QM_15 Datasheet, PDF (1/6 Pages) Analog Devices – HIGH RESOLUTION DIGITAL TO ANALOG CONVERTER

-.. ANALOG
W DEVICES
HighResolution,
0igitalto AnalogConverter
FEATURES
DAC-14/16QM
16 Bit Resolution
1.0
Linearity Error Less Than: IO.0015% (16 Bit Model)
Monotonic
IO.OO3%(14 Bit Model)
Compact 2:' x 4" x 0.4" Module
DTLITTL Compatible
DAC-QG
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0.1
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OBSOLETE VersatileInput Register
Many Code Options
Optional Amplifiers for Fastest Settling or HighestStability
Optional Transient Suppressor
4 Terminal OutpUt Connection
~. 0.01
0.001
10-7
GENERAL DESCRIPTION OF THE DAC-14/16QM
The DAC-14116QM_" hig_"h resolu_"tion digital to analog conver-
ters are compact 2 x 4 x 0.4 modules that offer true state-
of-the-art performance in applications demanding the utmost
in resolution and accuracy. Both units feature 16 bit resolu-
tion. The DAC-14QM has a maximum linearity error of
0.003% (at +25°C) while the DAC-16QM has a maximum
linearity error of only 0.0015% (at +25°C).
DESCRIPTION OF THE DAC-QG
temperatUre drift simply cannot be ignored. Several practical
installation guidelines are offered in the following sections to
help the user avoid these problems. Reprints of a two part
series written for Electronics magazine by the staff of Analog
Devices, Inc. discussing the details of high resolution data con-
version are also available to aid in the application of these
devices.
PERFORMANCE
Analog Devices., Inc. is committed to an extensive testing pro-
The DAC-QG is a manifold board which accepts any DAC-QM gram which assures the customer that every unit received is
from 8 to 16 bits and offers several optional circuit supplements. truly the precision device described in this data sheet. Some
The library of options includes: a "deglitcher" for limiting
very visible results of this program are the three documents
switching transients to 2 millivolts; a versatile input register with shipped with every converter. The first certifies calibration
provisions for one of five input codes; and a choice of high-
with methods and equipment traceable to the National
performance discrete output amplifiers to attain either opti-
Bureau of Standards. The second certifies the performance of
mum settling time, optimum stability, or lowest cost by using
the IC amplifier contained in the DAC-QM. The DAC-QG
the converter's internal reference zener over temperature and
over 1000 hours of burn-in. The third shows the actuallin-
also contains the offset and gain adjust potentiometers required earity deviation of the converter by means of a recording
by the DAC-QM.
which plots the difference between the converter's output and
DESIGN CONSIDERATIONS
the output of a super-precision DAC at each of the 65,536
possible input words.
Extreme care is required in the design, production, and appli-
cation of converters such as the DAC-14/16QM/QG in order
to insure that the fine resolution, broad dynamic range, and
the high degree of accuracy and linearity expected of these
precision devices is actUally achieved. Factors of only secon-
Ten-thousand hours of testing were also performed in order
to actually measure the long-tenn stability of these devices.
The impressive result was a linearity shift of less than
8ppm/IO,000 hours!
dary concern in the design of 12 bit converters can have an
overwhelmingly adverse impact on the operation of a 16 bit
unit. Consider the fact that a 16 bit converter with a 10VFS
output range has an LSB of only 153J.LV! Problems such as
thennocouple effects, voltage drops in connectors, low level
noise, radio frequency interference and output amplifier
D/A CONVERTERS 367