AD2008_15 Datasheet, PDF (1/6 Pages) Analog Devices – 4 DIGIT AC POWERED DPM WITH BECHMAN DISPLAYS

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4Y2Digit AC Powered
DPM With BeckmanDisplays
PRELIMINARY TECHNICAL DATA
FEATURES
AC Line Powered
Bright Seven-Segment Gas-Discharge Display
Floating Input: >100dB CMRR, 300V RMS CMV
NMR: >60dB @ 50 or 60Hz
:1:0.005%R :1:50,uV:1:1Digit Max Error
Auto-Zero Correction
,
OBSOLETE Optional Ratiometric Operation
Versatile Data Output Options - DTL!TTL!CMOS/PMOS
Compatible
APPLICA TIONS
Accurate Measurements in Noisy Electrical Environments
High Accuracy Read°l!ts for Test Equipment, Process Control
Instrumentation, and Analytical and Scientific Instruments
Analog Devices' AD2008 is a 4'12 digit AC line powered DPM
designed for making high accuracy measurements in adverse
electrical environments. The AD2008 measures bipolar voltages
with a full scale range of :1:1.9999V and an accuracy of :1:0.005%
reading :1:50,uV::':1 digit. The fuJl floating, opto-isolated input
section provides >100dB of common mode noise rejection at
common mode voltages up to 300V RMS even with control
signals and optional data outputs connected. In addition, the
easily interfaced to other data devices, two extra cost options
are available for applications requiring BCD data interfacing.
The AD2008/B provides full parallel latched BCD data for 4'12
digits, overload and polarity. The AD2006/X provides a pulse
train output and a polarity output, and the data must be
counted external to the DPM. To extend application versatility,
digital data output options are compatible to all DTL/TTL/
CMOS/PMOS logic systems.
dual slope integrating conversion technique allows >60dB of
normal mode noise rejection at 50 or 60Hz without filtering.
LARGE, BRIGHT, EASILY READ DISPLAY
The AD2008 presents a visual readout on large 0.55 inch
(l4mm) Beckman seven-segment gas-discharge displays. These
Full details on the data output options are given in the speci-
fications and timing diagram (Figure 2). The AD2008 nor-
mally provides 2.5 conversions per second. Externally trig-
gered rates up to 5 conversions per second or automatic re-
cycling at 5-10 conversions per second are also possible.
displays are easily rcad at distances up to 50 feet (15 meters)
and over viewing angles of 1300 in all ambient lighting condi-
tions. Four decimal points are externally programmable. Con-
trols are also available for display testing by illuminating all
display segments, and independently blanking either the
polarity sign or the entire display. The display lens is color
matched to the gas discharge display. The lens has a non-glare,
scratch-resistant finish and is easily marked with company logo
or measurement units.
OPTIONAL RATIOMETRIC OPERATION
The AD2008/R option allows the DPM to be used to measure
the ratio of two input voltages. This is very useful when
measuring with a transducer whose output is dependent on its
excitation voltage. The DPM measures the ratio of the two
voltages and thereby compensates for any variations caused by
instability in the excitation voltage. Both the analog input and
the external reference input are floating. For operation in the
ratiometric mode, the AD2008/R is supplied without internal
VERSATILE DATA OUTPUT OPTIONS
The AD2008 uses a MOS/LSI integrated circuit that provides
references; both positive and negative references must be sup-
plied externally.
4'12 decades of counters and latches with considerable savings
in size and power consumption. The data from this chip is
provided in a character serial format, one decade at a time,
(continued on page 3)
which is used to multiplex the display. Since this data is not
tJ
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.
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