AD2021_15 Datasheet, PDF (1/2 Pages) Analog Devices – LOGIC POWERED DPM WITH LED DISPLAYS

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--. ANALOG
W DEVICES
LowCost,3 1/2 Digit
LogicPoweredDPMwithLEDDisplays
I
AD2021 I
FEATURES
"Second Generation" MOS-LSIDesign
Large0.5#' (13mm) LED Dilplayl
-t5VDC Logic Powered
:t1.999V, :t199.9mV or :t19.99V Full Scale Ranges
Limit8d Differential Input
Low Power Consumption: 2.0 Watts
Small Size, Industry Standard Case Design
OBSOLETE APPLtCATIOHS
General Purpose Logic Powered DPM Applieations
Portable Applications Requiring Low Power Consumption
GENERAL DESCRIPTION
The AD2021 is a low cost, 3~ digit, +5V dc logic powered
digital panel meter with large LED displays. While designed for
general purpose DPM applications. the small size, light weight
and low power consumption of the AD2021 make it an ideal
digital readout for modern, compact instrument designs.
THE BENEFITS OF "SECOND GENERATION" DESIGN
The AD2021 is designed around MOS-LSI (Metal-oxide-Semi.
conductor. Large Scale Integration) integrated circuits, which
greatly reduce the number of components, and thereby tbe
size, and reduce power consumption to 2.0 watts. Both the
lower power consumption and fewer interconnections between
components promise greatly increased reliability, and tbe cir-
cuit design maintains the performance and features of earlier
DPMs. Large 0.5 inch (13mm) LED displays offer the visual
appeal of gas discharge displays with the ruggedness and life-
time of all solid state devices.
EXCELLENT PERFORMANCE AND EASY APPLICATION
The AD2021 measures input voltage over a full scale range of
:t1.999V de or :!:199.9mV dc ("S" option) with an accuracy
of :!:O.OS,,"reading %0.025% full scale :I:1 digit. Using the
"limited differential" input first used on Analog Devices'
AD2010, the AD2021 prevents ground loop problems and
provides 35 to SOdB of common mode rejection at common
mode voltages up to :l:200mV. Normal mode rejection is
4OdB at 50Hz to 60Hz.
BCD data outputs are provided in a bit parallel. character serial
format compatible to CMOS logic systems. For those applica-
tions requiring parallel BCD data. schemes for making the ser-
ial to parallel conversion are available. Controls to hold readings,
select decimal points and blank the display are provided.
DESIGNED AND BUILT FOR RELIABILITY
The AD2021 is packaged in Analog Devices' logic powered
DPM case size, only 1.25 incbes (32mm) deep. The small size
of this DPM makes it easy to accommodate in any instrument
Figure 1. AD2021 Bit Parallel Character Serial to Full Parallel
Data Conversion. AD2021 Pin Connections Are Shown in
Parentheses.
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.
For detailed infonnation, contact factory.
One Technology Way, P.O. Box 9106. Norwood. MA 02062.9106, U.S.A.
Tel: [phone]
Fax: [phone]
Twx: 710/394.6577
Telex: 924491
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