AD2025_15 Datasheet, PDF (1/4 Pages) Analog Devices – LOW COST 4 DIGIT DPMS WITH LED DISPLAYS

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LowCost4% Digit
DPMsWithLEDDisplays
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FEATURES
"Second Generation" MOS-lSI Design
large 0.43" (11mm) lED Displays
4* Digit Resolution - 40,000 Counts Full Scale
limited Differential Input
Either Line Powered (AD2025) or logic Powered (AD2028)
Interchangeable with 4% Digit DPMs (AD2024 or AD2027)
Industry Standard Case Designs
APPLICATIONS
High Resolution/High Accuracy Readout for:
Test Equipment
Process Control Instrumentation
Analytical and Scientific Instruments
O8 B ~., - ~. "."" . ,'- GENERAL DESCRIPTION
The AD2025 and AD2028 are low cost 4% digit DPMs with
S _{large LED displays. Both units offer the same features and iden-}
O ^{tical performance, but the AD2025 is ac line powered and the}
AD2028 is +5V dc powered.
e L The AD2025 and AD2028 are interchangeable with two 4\-2
digit DPMs available from Analog Devices, the AD2024 and
E _{AD2027 respectively. Thus, they can be used in applications}
T ^{where either a 4% or 4\-2digit display may be desirable in one}
E ^{basic application.}
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BCD data outputs are provided in a bit parallel, character serial
format compatible with CMOS logic systems. When applica-
tions require parallel BCD data, such as interfaces to printers,
comparators or slave displays, parallel BCD output options are
available that are compatible to standard TTL logic systems.
External power supply outputs at +5V and -25V (-25V only
on the AD2028) are made available for powering external cir-
cuitry. In addition, control inputs for conversion "Hold",
display blanking and decimal point selection are provided.
INDUSTRY STANDARD CASE DESIGNS
THE BENEFITS OF SECOND GENERATION DESIGN
Although both the AD2025 and AD2028 have identical elec-
The AD2025 and AD2028 are designed around MOS-LSI
trical designs, they are packaged in the case sizes that have
(Metal Oxide Semiconductor, Large Scale Integration) inte-
become industry standards for ac line powered and +5V dc
grated circuits which greatly reduce the number of components logic powered DPMs respectively. The AD2025 fits the 3.924"
and interconnections required to provide the performance and ^{x 1.682" (99.67 x 42.74mm) panel cutout common to most ac}
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features expected in a high resolution 4% digit DPM.
This "Second Generation" design, therefore, offers greatly
increased reliability and significantly lower cost at little com-
line powered DPMs, and the AD2028 fits the 3.175" x 1.810"
(80.65 x 45.97mm) panel cutout of the Analog Devices logic
power case design, now used by several other manufacturers
promise in performance. The large 0.43 inch (11mm) LED dis-
plays offer the brightness and readability previously available
of logic powered DPMs. Thus, interchangeability is assured,
allowing mechanical second sourcing for both these DPMs.
only with gas discharge displays with the added advantage of
DESIGNED AND BUILT FOR RELIABILITY
an all solid state component.
Even beyond the reliability advantages of the LSI-IC design
HIGH RESOLUTION AND VERSATILE FEATURES
These DPMs measure DC input voltages over a full scale range
of :t3.9999V or :t39.999V with an accuracy of :to.005% reading
:to.005% of full scale :tl digit. Using the "limited differential~,
input first used by Analog Devices on the AD2010, the
AD2025 and AD2028 prevent ground loop problems and pro-
vide 50dB of common mode rejection at common mode vol-
tages up to :t200mV. Normal mode rejection is 25dB at
50-60Hz.
and LED displays, the AD2025 and AD2028 have had extreme
care taken in their design and manufacture to insure reliability.
Manufacturing processes are monitored by continual quality
assurance inspections to insure proper workmanship and test-
ing. Automatic test equipment is used to test each DPM thor-
oughly and without error. And each AD2025 and AD2028,
like every Analog DevicesDPM, receivesa full one week failure-
free burn-in with power cycling before shipment.
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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 implica-
tion or otherwise under any patent or patent rights of Analog Devices.
P.O. Box 280; Norwood, Massachusetts 02062 U.S.A.
Tel: [phone]
Twx: 710/394-6577
Telex: 924491
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