AD2009_15 Datasheet, PDF (1/4 Pages) Analog Devices – DIGIT AC LICE POWERED DPM

,. ANALOG
W DEVICES
3Y2 Digit
AC LinePoweredDPM
I
AD2009
FEATURES
AC Line Powered
Bright, Seven Segment Gas Discharge Display
BCD Data Outputs Standard
Hold and -(rigger Control Signals
Full Scale Ranges of :t1.999V or :t199.9mV
Display Blanking Control
OBSOLETE Industry Standard Panel Cutout
APPLICATIONS
General Purpose DPM Applications Requiring AC Power and a
High Visibility Display
Data Logging and Digital Feedback Control Systems
GENERAL DESCRIPTION
The AD2009 is a low cost 3'h digit, AC line powered DPM de-
signed for general purpose DPM applications. The AD2009
measures bipolar input voltages over full scale ranges of either
:t1.999V or :t199 .9mV, with an accuracy of :to.l % reading :tl
digit and displays the readings on large, bright 0.55" (I4mm)
Beckman gas discharge displays.
will be available and future new products will be usable without
mechanical changes to their instruments or systems.
DESIGNED AND BUILT FOR RELIABILITY
Design and manufacturing techniques are chosen to insure reli-
ability in the AD2009. Conservative design techniques and
thorough component evaluation are only the beginning. Manu-
facturing processes are monitored by continuous quality assur-
LARGE, BRIGHT DISPLAY
ance inspections to insure proper workmanship and testing.
For display only applications, the Beckman display offers ex-
cellent appearance and visibility. The AD2009 display is easily
read up to 50 feet (ISm) away and over all ambient lighting
Like every other Analog Devices' DPM, each AD2009 is fully
tested for electrical specifications, calibrated, and given one
full week of failure free burn-in before shipment.
conditions. The non-glare lens allows a choice of either red or
amber display colors, and is easily silk-screened with company
logo or measurement units. External control of decimal points
and display blanking is provided.
SIMPLE DATA INTERFACING
THEORY OF OPERATION
The AD2009 uses a dual slope conversion technique with an
absolute value voltage to current converter input. The entire
conversion cycle takes less than 10 milliseconds, allowing a
complete conversion to be done during the negative half cycle
Since the AD2009 is designed around TTL logic circuits, paral- of the AC line, and the resulting reading is displayed during
lel BCD data, TTLlDTL compatible, is a standard feature,
the positive half cycle of the AC line. This scheme not only
allowing easy interfacing to a variety of data peripherals, such
insures a flicker free display, but also allows externally trig-
as digital comparators and line printers. Under internal con-
trol, the AD2009 converts at a nominal rate of six conversions
gered conversions at rates up to lOa/second for data inter-
facing applications. In order to insure a bright display even
per second. Using the Hold and Trigger controls, up to 100
conversions per second can be externally triggered.
INDUSTRY STANDARD CASE DESIGN
during operation at low line voltages and to help insure the
reliability of the Beckman displays, a separate power supply is
provided to continually illuminate two "keep-alives" in the
Beckman display.
In response to industry's urgent need for DPM standardization,
Analog Devices has adopted the most popular AC powered DPM
panel cutout size for the AD2009 and all future AC line pow-
ered DPM's. Since this 3.924" x 1.682" (99.67 x 42.72mm)
panel cutout is used by so many AC powered panel meters, the
potential DPM customers can be assured that second-sources
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 infrir.gements 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.
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